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      Deburring Tools
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    • Marking videos
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    • Deburring videos
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undefined edges and contours

automated and reliable deburring
Home > Deburring > Deburring tools

ingenious – simple – unique
Deburring tools engraflexx

The special feature of the engraflexx deburring tools developed by us is the flexible tool spindle bearing. This enables the automated deburring of parts with undefined edges, where the effective workpiece edge deviates from the programmed contour.

Gravostar Entgratwerkzeug

Deburring tools
for CNC machines

Used like a normal tool. No additional installation required. Automatic change-over via tool changer.

Gravostar elektrisches Entgratwerkzeug für Roboter

Deburring spindles
for robot use

Air operated for easy use. Electric drive for minimum energy consumption. Edition for use in robots.

Gravostar Entgratwerkzeug mit Radialbürste

Spindles for
special applications

Can be used with any motor. Extremely stable spindle bearing. Available in individual lengths.

Gravostar Kegelfrässtifte

Router and grinding
bits as accessories

Essential for a good result. Various shapes and sizes. Application-specific designs.

Advantages of automated deburring with engraflexx

Main advantage: saving of the workpiece deburring as a separate operation. This means that even parts with undefined edges come out of the production line completely deburred and can be further processed directly.

Thumbnail Entgraten Erklärt EN
Play

Fast

Through the use of multi-tooth
routers can reach very high
feed speeds are driven,
i.e. for deburring
usually only takes a few seconds

Wear-resistant

The solid carbide
routers are extremely wear resistant,
whereby a very long
lifetime is guaranteed

Process reliable

Measurement and position differences
between the programmed contour
and the effective workpiece edge
are automatically cleared, that is, all
Workpiece contours are automatically and uniformly deburred

Roland Zahner

Advice and customer service

Roland Zahner
Technical Support / Distribution

Tel. +41 (0) 71 940 06 76
E-Mail: info@gravostar.com

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Gravostar Entgratwerkzeuge Vorteile

Product advantages

The advantages of engraflexx deburring tools conveniently in a PDF for downloading

Download PDF now
Use in CNC machines
Use in robot systems
Spindles for special solutions
Router and grinding bits
FAQs
freqeuntly asked questions


Use in CNC machines

Gravostar deburring tool

engraflexx EC

The core element of the engraflexx EC tool type is the radially deflecting tool spindle, which is held in a central position by a pre-tensioned spring mechanism.
When the workpiece contour moves down, the router bit that is used therefore...

The core element of the engraflexx EC tool type is the radially deflecting tool spindle, which is held in a central position by a pre-tensioned spring mechanism.
When the workpiece contour moves down, the router bit that is used therefore always automatically positions itself at the workpiece edge that is to be effectively deburred – even if this differs somewhat from the programming.

This means that each workpiece is automatically provided with even deburring independently of any dimensional or position deviations.

Play

Field of application

Deburring of undefined edges on any workpieces
with different or undefined edges.

General information

  • Use in machining centres, automatic lathes, etc. (no additional installations required)
  • Direct drive via machine spindle (speed range approx. 3’000 – 8’000 rpm)
  • Standard model with 20 mm Weldon shank (ICS version and various special holders optionally available)

Tool specifications

  • Integrated, lateral deflection function up to max 5 mm
    • unchanged deflection force even with larger spindle deflection
    • uniform deburring, independent of dimensional deviations
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Lateral spindle deflection with adjustable deflection force
    • stepless adjustment via knurled sleeve
    • setting readable on engraved scale
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • milling dimensionally defined chamfers or seamless radii
    • reworking of workpiece contours with position deviations
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Gravostar Entgratwerkzeug

engraflexx EC-S

The core element of the engraflexx EC-S tool type is the radially deflecting tool spindle, which is held in a central position by a pre-tensioned spring mechanism.
When the workpiece contour moves down, the router bit that is used therefore...

The core element of the engraflexx EC-S tool type is the radially deflecting tool spindle, which is held in a central position by a pre-tensioned spring mechanism.
When the workpiece contour moves down, the router bit that is used therefore always automatically positions itself at the workpiece edge that is to be effectively deburred – even if this differs somewhat from the programming.

This means that each workpiece is automatically provided with even deburring independently of any dimensional or position deviations.

Play

Field of application

Deburring of undefined edges on any workpieces
with different or undefined edges.

General information

  • Version with reinforced deflection force for universal use in machining centres, automatic lathes, etc.
    (no additional installations required)
  • Direct drive via machine spindle (speed range approx. 3’000 – 8’000 rpm)
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)

Tool specifications

  • Integrated, lateral deflection function up to max 6 mm
    • unchanged deflection force even with larger spindle deflection
    • uniform deburring, independent of dimensional deviations
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Lateral spindle deflection with adjustable deflection force
    • stepless adjustment via knurled sleeve
    • setting readable on engraved scale
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • milling dimensionally defined chamfers or seamless radii
    • reworking of workpiece contours with position deviations
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Gravostar Entgratwerkzeug

engraflexx EC-KA – very short special editions

It may be necessary to use shorter tool versions or versions with an integrated tool holder, particular during operation on smaller machines with extremely tight space situations.
We can therefore also supply the engraflexx EC in different customised...

It may be necessary to use shorter tool versions or versions with an integrated tool holder, particular during operation on smaller machines with extremely tight space situations.
We can therefore also supply the engraflexx EC tools in different customised versions, some of which are even available from stock.

A sample of a small version with cylindrical shank shaft can be found adjacent.

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Gravostar Entgratwerkzeug

engraflexx EC – special edition with integrated tool shank

It may be necessary to use shorter tool versions or versions with an integrated tool holder, particular during operation on smaller machines with extremely tight space situations.
We can therefore also supply the engraflexx EC tools in different customised...

It may be necessary to use shorter tool versions or versions with an integrated tool holder, particular during operation on smaller machines with extremely tight space situations.
We can therefore also supply the engraflexx EC tools in different customised versions, some of which are even available from stock.

A sample of a small version with an integrated HSK40 tool shank can be found adjacent.

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Gravostar Entgratwerkzeug

engraflexx EC – short driven tool versions for lathes

It may be necessary to use shorter tool versions or versions with an integrated tool holder, particular during operation on smaller machines with extremely tight space situations...

It may be necessary to use shorter tool versions or versions with an integrated tool holder, particular during operation on smaller machines with extremely tight space situations.
We can therefore also supply the engraflexx EC tools in different customised versions, some of which are even available from stock.

A sample of a driven tool version VDI40 for lathes can be found adjacent.

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Gravostar deburring tool

engraflexx EC-E (for special applications upon request)

The core element of the engraflexx EC-E tool type is the radially deflecting tool spindle, which is held in a central position by a pre-tensioned spring mechanism.
When the workpiece contour moves down, the router bit that is used therefore...

The core element of the engraflexx EC-E tool type is the radially deflecting tool spindle, which is held in a central position by a pre-tensioned spring mechanism.
When the workpiece contour moves down, the router bit that is used therefore always automatically positions itself at the workpiece edge that is to be effectively deburred – even if this differs somewhat from the programming.

This means that each workpiece is automatically provided with even deburring independently of any dimensional or position deviations.

Field of application

Deburring of undefined edges on any workpieces
with extremely large dimensional deviations or unclear edges.

General information

  • Use in machining centres, automatic lathes, etc.
    (no additional installations required)
  • Direct drive via machine spindle
    (speed range approx. 3’000 – 5’000 rpm)
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)

Tool specifications

  • Integrated, lateral deflection function up to max 12 mm
    • uniform deburring, independent of dimensional deviations
    • unchanged deflection force even with larger spindle deflection
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Lateral spindle deflection with adjustable deflection force
    • stepless adjustment via knurled sleeve
    • setting readable on engraved scale
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • milling dimensionally defined chamfers or seamless radii
    • reworking of workpiece contours with position deviations
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Gravostar Entgratbürste

engraflexx EC-E (special design for brush application)

This special design with lateral deflection is used for fine deburring and reworking tasks on a wide range of workpieces. Processing tools suitable for use here include radial brushes, grinding bits and other grinding and polishing tools.

This special design with lateral deflection is used for fine deburring and reworking tasks on a wide range of workpieces. Processing tools suitable for use here include radial brushes, grinding bits and other grinding and polishing tools.
Mass and position differences in the processing surface are automatically compensated for by the deflecting spindle. The deflection force of the spindle can also be steplessly adjusted, so that work can always take place at the optimum pressure.

Upshot: using the engraflexx EC-E it is possible to take on previously unimagined deburring and rework tasks – with the greatest possible process reliability and automatic wear compensation of the processing tools.

Range of application

Defined, fine deburring and rework of arbitrary workpiece contours
with radial brushes, grinding or polishing tools.

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)

Tool specifications

  • Integrated, lateral deflection function up to max 12 mm
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Lateral spindle deflection with adjustable deflection force
    • stepless adjustment via knurled sleeve
    • setting readable on engraved scale
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free

Advantages compared to fixed clamped brushes

  • Automatic wear compensation of the deburring brush
    • less brush wear
    • conditions always consistent
    • no periodic readjustment required
  • Easy to use, low-wear brushes (usually with stainless steel wire)
    • no contamination of the coolant due to abrasive residues
    • massive savings when purchasing brushes in some case.
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Gravostar deburring tool

engraflexx SX / BAZ

The unique stability and the extremely quiet operation of the lateral deflection spindle are the main features of the engraflexx SX/BAZ.
This tool system is used for deburring work or part reworking on CNC machines...

The unique stability and the extremely quiet operation of the lateral deflection spindle are the main features of the engraflexx SX/BAZ.
This tool system is used for deburring work or part reworking on CNC machines. Anywhere where contours are being machined on workpieces whose dimensional or position differences have to be compensated for automatically and with maximum process-safety.

The result: deburring or part reworking is always carried out evenly, regardless of any dimensional or positional deviations.

Range of application

Deburring and reworking of any workpieces
with different or undefined edges.

General information

  • Universal use in CNC machines
    • torque arm must be fitted
    • application is the same as for angle or multi-spindle heads
  • Extremely slim deflectable spindle design
    • spindles available in different lengths (also for very deep machining areas)

Tool specifications

  • Integrated, lateral deflection function up to max 15 mm
    • unchanged deflection force even with larger spindle deflection
    • uniform deburring, independent of dimensional deviations
  • Lateral spindle deflection with adjustable deflection force
    • mechanically, preloaded via spring package
    • stepless adjustment via knurled sleeve
    • setting readable on engraved scale
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Separate, extremely stable spindle bearing
    • outstanding stability and quiet operation
    • speed limits: Standard 20’000 rpm, special 30’000 rpm
    • complete recording of the machining forces that are applied
  • Total weight of the spindle unit: 5.7 kg
  • Wide range of application options
    • reworking of cast parts
    • workpiece deburring with bevel cutting bit
    • process-safe deburring with brushes
  • Additional usage options of different end milling cutters, grinding bits etc.
    • reworking of workpiece contours with position deviations
    • for surface finishing, levelling of protruding material residue etc.

Options

  • Possibility of attaching lateral workpiece stops
    • milling of bigger and/or absolutely dimensionally accurate chamfers
    • milling of seamless radii
  • various spindle lengths, even individually manufactured ones, available
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Gravostar Entgratwerkzeug

engraflexx SX / BAZ-WA

This tool type has been designed for applications where seamless radii or larger, precisely defined chamfers have to be milled on workpieces or for other reworking on any undefined workpiece edges.
Unique stability and maximum running smoothness of the laterally deflectable...

This tool type has been designed for applications where seamless radii or larger, precisely defined chamfers have to be milled on workpieces or for other reworking on any undefined workpiece edges.
Unique stability and maximum running smoothness of the laterally deflectable spindle are the main features of the engraflexx SX/BAZ-WA. Due to the stable, separately pivoted workpiece stop, maximum process reliability is ensured at the same time.

Function of the stop system
Due to the special geometry of the stop nose and the smooth-running bearing, the stop automatically rotates around the spindle axis so that the stop tip is always directed against the edge to be machined.
This allows workpieces with various internal and external contours to be reworked or deburred with absolute process reliability.

Range of application

Exactly defined deburring or reworking of workpiece edges
with deviating positions or measurement differences, e.g.

  • Milling off of protruding burrs
  • Milling of dimensionally tolerated chamfers
  • Milling of seamless radii

General information

  • Universal use in CNC machines
    • torque arm must be fitted
      (application is the same as for angle or multi-spindle heads)
  • Tool is available with different tool holders
  • Highest process reliability even when used in series production
    • Stable, pivoting workpiece stop
    • always guarantees uniform machining dimensions
  • Use of commercially available milling cutters, grinding bits, etc.

Tool specifications

  • Integrated, lateral deflection function up to max 8 mm
    • unchanged deflection force even with larger spindle deflection
    • uniform deburring, independent of dimensional deviations
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Lateral spindle deflection with adjustable deflection force
    • mechanically, preloaded via spring package
    • stepless adjustment via knurled sleeve
    • setting readable on engraved scale
  • Separate, extremely stable spindle bearing
    • outstanding stability and quiet operation
    • speed limits: Standard 20’000 rpm, special 30’000 rpm
    • complete absorption of the machining forces that are applied
  • Wear-resistant hardened, extremely smooth-running, rotatably mounted workpiece stop
  • Total weight of the spindle unit: 5.9 kg
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Gravostar deburring tool

engraflexx LC-U (forward acting version)

The core element of the engraflexx LC-U tool type is the axially movable mounted tool spindle.
No special features need to be taken into consideration when using the LC-U with regard to maximum rpm etc. thanks to the centrally guided spindle...

The core element of the engraflexx LC-U tool type is the axially movable mounted tool spindle.
No special features need to be taken into consideration when using the LC-U with regard to maximum rpm etc. thanks to the centrally guided spindle.

Play

The axial spindle pre-tension force is continuously adjustable to the respective situation using the adjustable sleeve, with repeatable setting using the engraved scale. An extremely wide adjustment range for the different usage cases can be covered by the additional adjusting facility in the tool spindle.

The tool is mainly used for the deburring of workpiece edges with position differences in the axial and/or radial direction. Other application options are the milling of protruding material residue on cast workpieces etc., for example.

Field of application

Deburring of undefined edges on any workpieces
with deviating or unclear positioning.

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle resp. power unit
    (speed range approx. 3’000 – 15’000 rpm)
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)

Tool specifications

  • Integrated, axial deflection function up to max.10 mm
  • Adjustable force of the axial spindle deflection (pressure-active)
    • stepless adjustment via knurled sleeve and spindle adjustment
    • setting readable on engraved scale
  • Uniform deburring, independent of the lateral dimension deviations or height differences of the workpieces
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • for surface finishing, levelling of protruding material residue etc.
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Gravostar deburring tool with brush adapter

engraflexx LC-U / BA

The engraflexx LC-U/BA tool type is based on the engraflexx LC-U, which is also equipped with a spring-mounted, ring-shaped brush attachment.
The tool was designed for deburring workpieces where there is...

The engraflexx LC-U/BA tool type is based on the engraflexx LC-U, which is also equipped with a spring-mounted, ring-shaped brush attachment.
The tool was designed for deburring workpieces where there is a demand for absolute deburring freedom, i.e. where no secondary deburring whatsoever is permitted.

Dimensional and position differences are compensated for by the spring-mounted spindle in accordance with the deburring process with the engraflexx LC-U, i.e. the actual deburring is carried out by the router bit clamped in the tool. Any secondary burring that occurs is eliminated again in the same work step by the ring brush.

Field of application

Complete secondary burring-free deburring of any workpieces
with deviating or unclear positioning

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle resp. power unit
    (speed range approx. 3’000 – 6’000 rpm)
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)

Tool specifications

  • Integrated, axial deflection function up to max.10 mm
  • Adjustable force of the axial spindle deflection (pressure-active)
    • stepless adjustment via knurled sleeve and spindle adjustment
    • setting readable on engraved scale
  • Uniform deburring, independent of the lateral dimension deviations or height differences of the workpieces
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • axially movable ring brush
    • automatic positioning and wear compensation due to spring pretensioning
    • ring brush is easy to replace
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Gravostar deburring tool

engraflexx LC-UR (reverse acting version)

The core element of the engraflexx LC-UR tool type is the axially movable mounted tool spindle.
Unlike the LC-U version, the spindle is pre-tensioned axially under tension with this tool type, i.e. it is retracted in the starting position...

The core element of the engraflexx LC-UR tool type is the axially movable mounted tool spindle.
Unlike the LC-U version, the spindle is pre-tensioned axially under tension with this tool type, i.e. it is retracted in the starting position.

The axial spindle pre-tension force is continuously adjustable to the respective situation using the adjustable sleeve, with repeatable setting using the engraved scale. An extremely wide adjustment range for the different usage cases can be covered by the additional adjusting facility in the tool spindle.

The tool is mainly used for the deburring of reworked housing breakthroughs and bottom workpiece edges with position differences in the axial and/or radial direction.

Field of application

Deburring of undefined edges on any workpieces
with deviating or not clearly defined rear edges.

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle resp. power unit
    (speed range approx. 3’000 – 15’000 rpm)
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)

Tool specifications

  • Integrated, axial deflection function up to max.10 mm
  • Adjustable force of the axial, tensioned spindle deflection
    • stepless adjustment via knurled sleeve and spindle adjustment
    • setting readable on engraved scale
  • Uniform deburring, independent of the lateral dimension deviations or height differences of the workpieces
  • Collet chuck for holding the processing tools
    • standard diameter 8 mm (further diameters on request)
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • for surface finishing, levelling of protruding material residue etc.
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Gravostar deburring tool

engraflexx LC-UD (forward and reverse acting version)

The core element of the engraflexx LC-UD tool type is the mounted tool spindle, which is axially movable in both directions.
The tool can therefore be used for deburring work on the top and rear of the horizontal workpiece edges...

The core element of the engraflexx LC-UD tool type is the mounted tool spindle, which is axially movable in both directions.
The tool can therefore be used for deburring work on the top and rear of the horizontal workpiece edges.

Play

The starting position of the spindle is pre-tensioned at both sides (pressure and tensile) in the defined centre position due to the double-sided stop system. The ratio between the tensile setting and the pressure setting can be individually balanced using the adjusting sleeve or setting screw (adaptation to vertical and horizontal use of the tool).

The tool is mainly used for the deburring of reworked housing breakthroughs and workpieces on which top and bottom with position differences are present.

Field of application

Deburring of any workpieces with deviating top and bottom edges
which have to be machined from one side.

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle resp. power unit
    (speed range approx. 3’000 – 15’000 rpm)
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)

Tool specifications

  • Special version with integrated, axial spindle-deflection function of max.10 mm
    (with shift at tensile or pressure side)
  • Adjustable compensation function between tensile and pressure pre-tension
    • stepless adjustment via knurled sleeve and spindle adjustment
    • setting readable on engraved scale
  • Uniform deburring, independent of the lateral dimension deviations or
    height differences of the workpieces
  • Collet chuck for holding the processing tools
    • standard diameter 8 mm (further diameters on request)
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • for surface finishing, levelling of protruding material residue etc.
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Gravostar deburring tool for machining centres

LC-UD / HSK63 (special version with integrated tool holder HSK63)

The core element of the engraflexx LC-UD / HSK63 tool type is the mounted tool spindle, which is axially movable in both directions.
The tool can therefore be used for deburring work on the top and rear of the horizontal workpiece edges...

The core element of the engraflexx LC-UD / HSK63 tool type is the mounted tool spindle, which is axially movable in both directions.
The tool can therefore be used for deburring work on the top and rear of the horizontal workpiece edges.

The starting position of the spindle is pre-tensioned at both sides (pressure and tensile) in the defined centre position due to the double-sided stop system. The ratio between the tensile setting and the pressure setting can be individually balanced using the adjusting sleeve or setting screw (adaptation to vertical and horizontal use of the tool).

The tool is mainly used for the deburring of reworked housing breakthroughs and workpieces on which top and bottom with position differences are present.

Field of application

Deburring of any workpieces with deviating
top and bottom edges which have to be machined from one side.

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle resp. power unit
    (speed range approx. 3’000 – 15’000 rpm)
  • Special version with integrated tool holder HSK63
    (ICS version and various special holders optionally available)

Tool specifications

  • Special version with integrated, axial spindle-deflection function of max.10 mm
    (with shift at tensile or pressure side)
  • Adjustable compensation function between tensile and pressure pre-tension
    • stepless adjustable adjustment via adjusting screw
  • Uniform deburring, independent of the lateral dimension deviations or height differences of the workpieces
  • Collet chuck for holding the processing tools
    • standard diameter 8 mm (further diameters on request)
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • for surface finishing, levelling of protruding material residue etc.
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Gravostar deburring tool

engraflexx LC-E (forward acting special version)

The core element of the engraflexx LC-E tool type is the axially movable mounted tool spindle.
No special features need to be taken into consideration when using the LC-E with regard to maximum rpm etc. thanks to the centrally guided spindle...

The core element of the engraflexx LC-E tool type is the axially movable mounted tool spindle.
No special features need to be taken into consideration when using the LC-E with regard to maximum rpm etc. thanks to the centrally guided spindle.

The axial spindle pre-tension force is continuously adjustable to the respective situation using the adjustable sleeve, with repeatable setting using the engraved scale. An extremely wide adjustment range for the different usage cases can be covered by the additional adjusting facility in the tool spindle.

The tool is mainly used for the deburring of workpiece edges with position differences in the axial and/or radial direction. Other application options are the milling of protruding material residue on cast workpieces etc., for example.

Field of application

Deburring and reworking of any deep positioned areas on workpieces
with deviating or unclear positioning.

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle resp. power unit
    (speed range approx. 3’000 – 15’000 rpm)
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)
  • Also available in reverse or double-sided version

Tool specifications

  • Integrated, axial deflection function up to max.10 mm
  • Adjustable force of the axial spindle deflection (pressure-active)
    • stepless adjustment via knurled sleeve and spindle adjustment
    • setting readable on engraved scale
  • Uniform deburring, independent of the lateral dimension deviations or height differences of the workpieces
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • for surface finishing, levelling of protruding material residue etc.
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Gravostar deburring tool

engraflexx LC-ED (forward and reverse acting special version)

The core element of the engraflexx LC-ED tool type is the mounted tool spindle, which is axially movable in both directions.
The tool can therefore be used for deburring work on the top and rear of the horizontal workpiece edges...

The core element of the engraflexx LC-ED tool type is the mounted tool spindle, which is axially movable in both directions.
The tool can therefore be used for deburring work on the top and rear of the horizontal workpiece edges.

The starting position of the spindle is pre-tensioned at both sides (pressure and tensile) in the defined centre position due to the double-sided stop system. The ratio between the tensile setting and the pressure setting can be individually balanced using the adjusting sleeve or setting screw (adaptation to vertical and horizontal use of the tool).

The tool is mainly used for the deburring of reworked housing breakthroughs and workpieces on which top and bottom with position differences are present.

Field of application

Deburring of any workpieces
with deviating top and bottom edges which have to be machined from one side.

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle resp. power unit
    (speed range approx. 3’000 – 15’000 rpm)
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)

Tool specifications

  • Special version with integrated, axial spindle-deflection function of max.10 mm
    (with shift at tensile or pressure side)
  • Adjustable compensation function between tensile and pressure pre-tension
    • stepless adjustment via knurled sleeve and spindle adjustment
    • setting readable on engraved scale
  • Uniform deburring, independent of the lateral dimension deviations or height differences of the workpieces
  • Collet chuck for holding the processing tools
    • standard diameter 8 mm (further diameters on request)
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • for surface finishing, levelling of protruding material residue etc.
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Gravostar Entgratwerkzeug

engraflexx LC-XE (extremely extended forward acting model)

The core element of the engraflexx LC-XE tool type is the axially movable mounted tool spindle.
No special features need to be taken into consideration when using the LC-XE with regard to maximum rpm etc. thanks to the centrally guided spindle...

The core element of the engraflexx LC-XE tool type is the axially movable mounted tool spindle.
No special features need to be taken into consideration when using the LC-XE with regard to maximum rpm etc. thanks to the centrally guided spindle.

The axial spindle pre-tension force is continuously adjustable to the respective situation using the adjustable sleeve, with repeatable setting using the engraved scale. An extremely wide adjustment range for the different usage cases can be covered by the additional adjusting facility in the tool spindle.

The tool is mainly used for the deburring of extremely low-lying workpiece edges with position differences in the axial and/or radial direction. Other application options are the milling of protruding material residue on cast workpieces etc., for example.

Field of application

Deburring and reworking of any deep positioned areas on workpieces
with deviating or unclear positioning.

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle resp. power unit
    (speed range approx. 3’000 – 15’000 rpm)
  • Standard model with 20 mm Weldon shank
    (ICS version and various special holders optionally available)
  • Also available in reverse or double-sided version

Tool specifications

  • Integrated, axial deflection function up to max.10 mm
  • Adjustable force of the axial spindle deflection (pressure-active)
    • stepless adjustment via knurled sleeve and spindle adjustment
    • setting readable on engraved scale
  • Uniform deburring, independent of the lateral dimension deviations or height differences of the workpieces
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different stop cutters, grinding bits etc.
    • for surface finishing, levelling of protruding material residue etc.
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Gravostar deburring tool for brosh use

engraflexx LC-S / BA

The combination with the engraflexx LC-S deburring tool has considerable advantages with regard to process safety, reducing operating costs and improving quality compared to deburring with fixed clamped brushes.
The core element of the tool is the tool spindle, which is spring mounted...

The combination with the engraflexx LC-S deburring tool has considerable advantages with regard to process safety, reducing operating costs and improving quality compared to deburring with fixed clamped brushes.
The core element of the tool is the tool spindle, which is spring mounted in the axial direction. The deburring brush therefore always affects the tool with even pressure – and consistent ratios means consistent results.

Field of application

Rational, process-safe deburring of tools with complex and/or undefined edges.
Mainly used for tools made from aluminium, GGG, GG, etc.

General information

  • Use in machining centres, automatic lathes, special systems, robots etc.
    (no additional installations required)
  • Direct drive via machine spindle resp. power unit
  • Standard model with 20 mm Weldon shank
    (various HSK, SK or special holders optionally available)

Tool specifications

  • Stable mounted, tool spindle that is axially movable by up to 20 mm
  • Adjustable force of the axial spindle deflection
    • stepless adjustment via knurled sleeve and spindle adjustment
    • setting readable on engraved scale
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Extremely high degree of process reliability due to mechanical deflection function integrated into the tool
    • designed for series production, completely maintenance-free

Advantages compared to fixed clamped brushes

  • Automatic wear compensation of the deburring brush
    • less brush wear
    • conditions always consistent
    • no periodic readjustment required
  • Easy to use, low-wear brushes (usually with stainless steel wire)
    • no contamination of the coolant due to abrasive residues
    • massive savings when purchasing brushes in some cases

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Roland Zahner

Advice and customer service

Roland Zahner
Technical Support / Distribution

Tel. +41 (0) 71 940 06 76
E-Mail: info@gravostar.com

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Use in robot systems

Use in robot systems makes particular sense when manufacturing very large numbers of parts. Additional operations such as finish machining of parts and deburring etc. can be done simultaneously for effective part processing.
A variety of different spindle versions with integrated compressed air or electric drives are available for this area of use.

Entgratspindeln Gegenüberstellung

Comparison:
Properties of tools with compressed air or electrically operated drive spindle are shown in the table opposite

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Gravostar deburring tool

engraflexx AP

Tool with integrated, laterally deflecting compressed air spindle.
The relatively low weight enables use in smaller robot cells and special systems. The spindle deflection function reacts very quickly and smoothly...

Tool with integrated, laterally deflecting compressed air spindle.
The relatively low weight enables use in smaller robot cells and special systems. The spindle deflection function reacts very quickly and smoothly due to the special bearings.

The result: deburring or part reworking is always carried out evenly, regardless of any dimensional or positional deviations.

Field of application

Deburring and reworking of many different types of workpiece
with different or undefined edges.

General information

  • Universal use in robots and special systems
  • Driven by an integrated air spindle (speed 30’000 rpm)
  • Slim construction, low weight (< 2 kg)

Tool specifications

  • Integrated, lateral deflection function up to max 15 mm
    • unchanged deflection force even with larger spindle deflection
    • uniform deburring, independent of dimensional deviations
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Lateral spindle deflection with adjustable deflection force
    • mechanically preloaded via spring assembly
      (deflection force independent of possible compressed air fluctuations)
    • stepless adjustment via knurled sleeve
    • setting readable on engraved scale
  • Quick-change system for exchanging the compressed air spindle
    • Spindle can be replaced in a few easy steps
    • no downtimes in the event of defects due to crashes or wear
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different end milling cutters, grinding bits etc.
    • milling dimensionally defined chamfers or seamless radii
    • reworking of workpiece contours with position deviations

Option

  • Anbau von lateral workpiece stop
    • milling of bigger and/or absolutely dimensionally accurate chamfers
    • milling of seamless radii

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Gravostar electric deburring tool for robots

engraflexx ESP

A core element of the engraflexx ESP is the laterally deflecting, electric spindle with infinitely variable speed adjustment. This consists of an air-cooled high frequency motor with integrated collet chuck for tool clamping.
Thanks to the tried and tested electric drive, efficiency and process-safety are...

A core element of the engraflexx ESP is the laterally deflecting, electric spindle with infinitely variable speed adjustment. This consists of an air-cooled high frequency motor with integrated collet chuck for tool clamping.

Thanks to the tried and tested electric drive, efficiency and process-safety are among the special characteristics of the spindle.
The spindle (start/stop command, speed specification etc.) is actuated via the frequency converter that is connected to the robot and the higher-order machine controller.

This tool system is used for deburring work or part reworking on robots or special systems. Anywhere where contours are being machined on workpieces whose dimensional or position differences have to be compensated for automatically and with maximum process-safety.

Field of application

Deburring and reworking of many different types of workpiece
with different or undefined edges.

General information

  • Universal use in robots and special systems
  • Driven by an integrated electrical high-frequency spindle
  • Compact, stable construction

Tool specifications

  • Integrated, lateral deflection function up to 10 mm
    • unchanged deflection force even with larger spindle deflection
    • uniform deburring, independent of dimensional deviations
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Lateral spindle deflection with adjustable deflection force
    • mechanically, preloaded via spring package
    • stepless adjustment via adjusting knob
    • setting readable on engraved scale
  • Driven by an electrical high-frequency spindle motor
    • power consumption 380 W
    • speed is infinitely adjustable via frequency converter (speed 1’000-24’000 rpm)
    • different monitoring functions such as speed stability etc.
  • Total weight of the spindle unit: 4.8 kg
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different end milling cutters, grinding bits etc.
    • milling dimensionally defined chamfers or seamless radii
    • reworking of workpiece contours with position deviations

Options

  • Pneumatically adjustable, lateral pre-tension pressure
  • Deflection blocking function
  • Lateral workpiece stop
    • milling of bigger and/or absolutely dimensionally accurate chamfers
    • milling of seamless radii
  • Automatic tool change unit

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Gravostar electric deburring tool for robot

engraflexx ESP / VA-175

A core element of the engraflexx ESP is the laterally deflecting, electric spindle with infinitely variable speed adjustment. This consists of an air-cooled high frequency motor with integrated collet chuck for tool clamping.
Thanks to the tried and tested electric drive, efficiency and process-safety...

A core element of the engraflexx ESP is the laterally deflecting, electric spindle with infinitely variable speed adjustment. This consists of an air-cooled high frequency motor with integrated collet chuck for tool clamping.

Thanks to the tried and tested electric drive, efficiency and process-safety are among the special characteristics of the spindle.
The spindle (start/stop command, speed specification etc.) is actuated via the frequency converter that is connected to the robot and the higher-order machine controller.

This tool system is used for deburring work or part reworking on robots or special systems. Anywhere where workpiece areas that are difficult to access (for example recessed lying in housings etc.) are being machined on workpieces whose dimensional or position differences have to be compensated for automatically and with maximum process-safety.

Field of application

Deburring and reworking of workpiece areas that are difficult to access
with different or undefined edges.

General information

  • Universal use in robots and special systems
  • Driven by an integrated electrical high-frequency spindle
  • Compact, stable construction

Tool specifications

  • Integrated, lateral deflection function up to 25 mm
    • unchanged deflection force even with larger spindle deflection
    • uniform deburring, independent of dimensional deviations
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Lateral spindle deflection with adjustable deflection force
    • mechanically, preloaded via spring package
    • stepless adjustment via adjusting knob
    • setting readable on engraved scale
  • Driven by an electrical high-frequency spindle motor
    • power consumption 380 W
    • speed is infinitely adjustable via frequency converter (speed 1’000-24’000 rpm)
    • different monitoring functions such as speed stability etc.
  • Total weight of the spindle unit: 13.5 kg
  • Short deburring time
    • feed speed approx. 2’000 – 8’000 rpm depending on the application
  • High removal rate due to use of carbide rotor pins
    • easily replaceable via collet
    • can be used for practically any machinable materials
  • Additional usage options of different end milling cutters, grinding bits etc.
    • milling dimensionally defined chamfers or seamless radii
    • reworking of workpiece contours with position deviations

Options

  • Pneumatically adjustable, lateral pre-tension pressure
  • Deflection blocking function
  • Automatic tool change unit

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Gravostar electic deburring tool for robots

engraflexx ELC

A core element of the engraflexx ELC the axially movable tool spindle with integrated chuck for tool clamping. This consists of an electric, air-cooled high frequency motor with infinitely variable speed adjustment.
Thanks to the tried and tested electric drive, efficiency and process-safety...

A core element of the engraflexx ELC the axially movable tool spindle with integrated chuck for tool clamping. This consists of an electric, air-cooled high frequency motor with infinitely variable speed adjustment.

Thanks to the tried and tested electric drive, efficiency and process-safety are among the special characteristics of the spindle.
The spindle (start/stop command, speed specification etc.) is actuated via the frequency converter that is connected to the robot and the higher-order machine controller.

This tool system is used for deburring work or part reworking on robots or special systems. Anywhere where contours are being machined on workpieces whose dimensional or position differences have to be compensated for automatically and with maximum process-safety.

Field of application

Deburring and reworking of many different types of workpiece
with different or undefined edges.

General information

  • Universal use in robots and special systems
  • Driven by an integrated electrical high-frequency spindle
  • Compact, stable construction

Tool specifications

  • Integrated, axially spring mounted deburring spindle
    • axial deflection function up to 10 mm
  • Chuck for holding the processing tools
    • span diameter 1-8 mm
  • Axial spindle deflection with adjustable deflection force
    • mechanically, preloaded via spring package
    • stepless adjustment via adjusting knob
    • setting readable on engraved scale
  • Driven by an electrical high-frequency spindle motor
    • power consumption 700 W
    • speed is infinitely adjustable via frequency converter (speed 1’000-18’000 rpm)
    • different monitoring functions such as speed stability etc.
  • Total weight of the spindle unit: 6.5 kg
  • Wide range of application options
    • reworking of cast parts
    • workpiece deburring with bevel cutting bit
    • process-safe deburring with brushes
  • Additional usage options of different end milling cutters, grinding bits etc.
    • reworking of any workpieces with deviating or unclear positioning
    • finisching of surfaces, equalisation of protuding material, etc.

Options

  • pneumatically adjustable, lateral pre-tension pressure
  • deflection blocking function
  • automatic tool change unit

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Gravostar workpiece stop

Lateral workpiece stop attachment

The lateral workpiece stop attachment can be used in conjunction with the tool types engraflexx AP, ESP, and SX.
Due to the special geometry of the stop nose and the smooth-running bearing, the stop automatically rotates around the spindle axis so that the stop tip is always...

The lateral workpiece stop attachment can be used in conjunction with the tool types engraflexx AP, ESP, and SX.
Due to the special geometry of the stop nose and the smooth-running bearing, the stop automatically rotates around the spindle axis so that the stop tip is always directed against the edge to be deburred. This means that workpieces with a wide variety of internal and external contours can be reliably reworked or deburred.

The lateral workpiece stop attachment is used if dimensionally tolerated chamfers or seamless radii have to be milled on workpieces.

Special feature of the stop system:
the router bit positions itself directly onto the workpiece edge during “conventional” use of the deflecting spindles. Accordingly, the thickness of the burr can have an influence on the dimensions of the deburring, i.e. with different burr formation thicknesses, the deburring can also have some differences.

If the deflecting spindle with workpiece stop attachment is used, this supports itself at the side on the edge of the workpiece. The main benefit: the milling cutter clamped in the spindle is always held at the same defined distance from the spindle regardless of the position difference or burr thickness.
Therefore, neither the burr thickness, feed speed or the lateral pre-tensioning force has an influence on the dimensions of the edge machining.

Application area

Precisely defined reworking of workpiece edges
with deviating positions or dimensional differences, e.g.

  • Milling off of protruding burrs
  • Milling of dimensionally tolerated chamfers
  • Milling of seamless radii

General information

  • Universal use using different adapters for
    • engraflexx AP
    • engraflexx ESP
    • engraflexx SX

Tool specifications

  • Rotating stop as a core element
    • optimal accessibility of a wide range of contour areas
    • extremely smooth-running thanks to double ball bearings
    • stable and wear resistant (hardened end stop surfaces)
  • Different tip radii available
    • for the milling of different radii
    • for the use of milling cutters with different diameters
    • workpiece stop attachment is simple to replace without using tools

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Roland Zahner

Advice and customer service

Roland Zahner
Technical Support / Distribution

Tel. +41 (0) 71 940 06 76
E-Mail: info@gravostar.com

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Spindles for special solutions

In particular applications or in special purpose machines etc., the use of compensating spindles can sometimes be necessary for the finish machining of parts or in deburring or brushing operations.
We offer special purpose spindles with stable mountings for this purpose which can be flange-mounted onto any drive motor.

Gravostar deburring tool

engraflexx SX

The unique stability and the extremely quiet operation of the lateral deflection spindle are the main features of the engraflexx SX. This tool system is used for deburring or part reworking on robots or special systems, and also on CNC machines...

The unique stability and the extremely quiet operation of the lateral deflection spindle are the main features of the engraflexx SX. This tool system is used for deburring or part reworking on robots or special systems, and also on CNC machines.
Anywhere where contours are being machined on workpieces whose dimensional or position differences have to be compensated for automatically and with maximum process-safety.

The result:
deburring or part reworking is always carried out evenly, regardless of any dimensional or positional deviations.

Field of application

Deburring and reworking of any workpieces
with different or undefined edges.

General information

  • Universal use in robots and special systems
  • Any drive motor can be fitted
  • Extremely slim spindle design
  • Stable flange mounting

Tool specifications

  • Integrated, lateral deflection function up to max 15 mm
    • unchanged deflection force even with larger spindle deflection
    • uniform deburring, independent of dimensional deviations
  • Lateral spindle deflection with adjustable deflection force
    • mechanically, preloaded via spring package
    • stepless adjustment via knurled sleeve
    • setting readable on engraved scale
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Separate, extremely stable spindle bearing
    • outstanding stability and quiet operation
    • speed limits: Standard 20’000 rpm, special 30’000 rpm
    • complete recording of the machining forces that are applied
  • Total weight of the spindle unit: 1.8 kg
  • Wide range of application options
    • reworking of cast parts
    • workpiece deburring with bevel cutting bit
    • process-safe deburring with brushes
  • Additional usage options of different end milling cutters, grinding bits etc.
    • reworking of workpiece contours with position deviations
    • for surface finishing, levelling of protruding material residue etc.

Options

  • lateral workpiece stop
    • milling of bigger and/or absolutely dimensionally accurate chamfers
    • milling of seamless radii
  • Version BAZ: use in machining centres

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Gravostar deburring tool with radial brush

engraflexx SX / BA (special design for brush application)

The unique stability and the extremely quiet operation of the lateral deflection spindle are the main features of the engraflexx SX. This tool system is used for deburring or part reworking on robots or special systems, and also on CNC machines...

The unique stability and the extremely quiet operation of the lateral deflection spindle are the main features of the engraflexx SX. This tool system is used for deburring or part reworking on robots or special systems, and also on CNC machines.
Anywhere where contours are being machined on workpieces whose dimensional or position differences have to be compensated for automatically and with maximum process-safety.

The result:
deburring or part reworking is always carried out evenly, regardless of any dimensional or positional deviations.

Range of application

Defined, fine deburring and rework of arbitrary workpiece contours
with radial brushes, grinding or polishing tools.

General information

  • Universal use in robots and special systems
  • Any drive motor can be fitted
  • Stable flange mounting
  • Extremely slim spindle design
    • Virtually all individual spindle lengths are available
  • Use of a wide range of tools possible, such as
    • Radial brushes
    • Grinding bits or polishing tools
    • Router bits

Tool specifications

  • Integrated, lateral deflection function up to max 15 mm
    • unchanged deflection force even with larger spindle deflection
    • uniform deburring, independent of dimensional deviations
  • Lateral spindle deflection with adjustable deflection force
    • mechanically, preloaded via spring package
    • stepless adjustment via knurled sleeve
    • setting readable on engraved scale
  • Collet chuck for holding the processing tools
    • standard diameter 6 mm (further diameters on request)
  • Separate, extremely stable spindle bearing
    • outstanding stability and quiet operation
    • speed limits: Standard 20’000 rpm, special 30’000 rpm
    • complete recording of the machining forces that are applied
  • Total weight of the spindle unit: 1.8 kg

Advantages compared to fixed clamped brushes

  • Automatic wear compensation of the deburring brush
    • less brush wear
    • conditions always consistent
    • no periodic readjustment required
  • Easy to use, low-wear brushes (usually with stainless steel wire)
    • massive savings when purchasing brushes in some cases

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Roland Zahner

Advice and customer service

Roland Zahner
Technical Support / Distribution

Tel. +41 (0) 71 940 06 76
E-Mail: info@gravostar.com

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Router and grinding bits

Solid carbide router bits, like those also used in manual grinders, are normally used in conjunction with the spindles we manufacture. Particularly when using the engraflexx EC and LC versions it is important to note that the choice of the router bit has a decisive effect on the outcome of the deburring.

Normal, commercially available or specially fashioned router bits are used depending on the particular problem (the material to be machined, the contour of the part or tool model). If required, we also manufacture customer-specific milling cutters, special purpose router bits or abrasive bits.

Gravostar conical router bits

Conical router bits

Solid carbide conical router bits are used for most deburring tasks.
Depending on the respective requirements (desired size and quality of the deburring, workpiece contour to be deburred, etc.), these are standard products or reworked or specially...

Solid carbide conical router bits are used for most deburring tasks.
Depending on the respective requirements (desired size and quality of the deburring, workpiece contour to be deburred, etc.), these are standard products or reworked or specially manufactured router bits.

On the side you can see a selection of the conical router bits offered by us, all of which are available from stock.

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Gravostar 90° deburring cutter

Conical router bits with extended shank

Conical router bits with extended shank are used for deburring contours whose accessibility is restricted due to interfering edges etc.
The deburring of recessed workpiece edges is also...

Conical router bits with extended shank are used for deburring contours whose accessibility is restricted due to interfering edges etc.
The deburring of recessed workpiece edges is also a classic application of these router bit versions.

On the side you can see a selection of the conical router bits we offer with an extended shank.
A certain standard range is available from stock. Special router bits with shanks of any length can also be manufactured, taking into consideration the respective delivery time.

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Gravostar Spezial-Kegelfrässtifte

Special conical router bits

The use of special router bits is required for deburring rear-side edges.
For this application we essentially offer two versions of router bits...

The use of special router bits is required for deburring rear-side edges.
For this application we essentially offer two versions of router bits:

  • Version with simple reverse cutting toothing (for deburring of rear-lying edges)
  • Version with double-sided toothing (for deburring front and rear-lying edges)

On the side you can see a selection of the special conical router bits we offer, of which a standard range is available from stock. For special applications, the router bits can also be manufactured in various sizes and designs to customer specifications.

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Gravostar Frässtifte in Sonderform

Router bits in special shapes

Depending on the respective application, router bits with different shapes are required. In addition, we offer a wide range in various sizes and shapes.
The selection of the router bit always depends on...

Depending on the respective application, router bits with different shapes are required. In addition, we offer a wide range in various sizes and shapes.
The selection of the router bit always depends on the task at hand. If this cannot be solved with a standard product, special router bits can also be produced to customer specifications in any shape.

 On the side you can see a selection of the router bits we offer, most of which are available from stock.

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Gravostar Frässtifte in Zylinderform

Router bits in cylindrical form

Router bits in cylindrical form are often used for milling off protruding residual material.
A typical application is e.g. the milling off of protruding parting lines on castings etc....

Router bits in cylindrical form are often used for milling off protruding residual material.
A typical application is e.g. the milling off of protruding parting lines on castings etc.

The router bits are available in different sizes and toothings as standard. For special applications, the cylindrical router bits can also be manufactured in any dimensions.

In principle, a distinction is made between two types of cylindrical router bits:

  • Standard version with gear teeth on the circumference (for use in tool types with laterally deflectable spindles)
  • Version with additional spur toothing (for use in tool types with axially spring-loaded spindles)

On the side you can see a selection of the router bits we offer, most of which are available from stock.

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Gravostar Anschlagfräser

Special milling cutter with integrated workpiece stop

Milling cutters with integrated workpiece stop are used in conjunction with the tool types engraflexx EC- or ESP- and SX with a laterally deflectable spindle.
The main area of application is the deburring or reworking of...

Milling cutters with integrated workpiece stop are used in conjunction with the tool types engraflexx EC- or ESP- and SX with a laterally deflectable spindle.

The main area of application is the deburring or reworking of workpieces, where there are increased demands, such as:

  • Precise milling of protruding material residues or burrs without damaging the actual workpiece contour
  • Milling of minimal, often narrowly tolerated chamfers
  • Milling of larger, dimensionally accurate chamfers
  • Milling of seamless radii

Depending on the requirements, the milling cutters are fitted with ball bearings or rotating stop pins as stop elements.

On the side you can see a selection of the stop milling cutters offered by us and available from stock.

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Gravostar Schleifstifte

Grinding bits and special grinding elements

For certain applications, grinding bits or special grinding elements are used in conjunction with the deflectable tools.
Especially in robot applications, the deflectable tools manufactured...

For certain applications, grinding bits or special grinding elements are used in conjunction with the deflectable tools.

Especially in robot applications, the deflectable tools manufactured by us are often equipped with an automatic tool changing system.
As actual grinding bits or grinding elements, the most diverse tools available on the market or specially manufactured tools are used.

As a user, you do not need to worry about the selection in this respect either, as we offer our customers the complete tool solution for each new application: this consists of the deflectable deburring tool and the actual machining tool such as a router or grinding bit, etc.

On the side you can see a selection of the possible grinding elements.

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Roland Zahner

Advice and customer service

Roland Zahner
Technical Support / Distribution

Tel. +41 (0) 71 940 06 76
E-Mail: info@gravostar.com

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All questions resolved
FAQs – freqeuntly asked questions

The special feature of the engraflexx deburring tools developed by us is the flexible tool spindle bearing. This enables the automated deburring of parts with undefined edges, where the effective workpiece edge deviates from the programmed contour.

As standard, all tool versions are equipped with a cylindrical Weldon shank of 20 mm.
In principle, however, all tools can also be supplied with integrated tool holders such as HSK etc., some of which are even available from stock.

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Which tool holders are the tools equipped with?

As standard, all tool versions are equipped with a cylindrical Weldon shank of 20 mm.

In principle, however, all tools can also be supplied with integrated tool holders such as HSK etc., some of which are even available from stock.

What does the adjustment of the knurled nut cause?

Only the pressure with which the milling cutter is pressed against the workpiece is affected by this adjustment.
The maximum deflection measurement is not affected by it.

Does the milling cutter position change with an adjustment in pressure?

No, the position of the router bit remains unchanged with the adjustment of the lateral contact pressure.

Are the spindles flexible deflectable in a radial and axial direction?

Because both deflection directions would mutually influence each other, these are not combined in a single tool.
We offer the two deflection processes in different tool versions: the EC- version with radial deflection principle and the LC- version with the axial spring-preloaded spindle.

What are the decision criteria for radial or axial spindle deflection?

There are various parameters such as workpiece contour, material, burr formation etc. which have an influence on the tool selection. This means that a lot of practical experience is required, which is why every new application is clarified by our application technicians by telephone.

How does the contact pressure change with the deflection?

The lateral pressure force remains practically unchanged over the entire scope of spindle deflection, no matter whether it is deflected by 5 or 1 mm only.

What materials can the tools be used for?

The engraflexx deburring tools can be used for practically all machined materials. However, it should be noted that different deburring cutters must be used depending on the material of the workpiece.
Depending on the materials to be processed and the deburring requirements, a wide variety of grindig bits can be used in the tools.

What type of deburring cutter makes the most sense?

As a standard we use conical router bits with a point angle of 90° with our tools. Depending on the task, however, routers with a wide variety of contours are also used.

Which milling cutter diameters should one process with?

This depends essentially on the desired results.
As a basic rule, with larger milling cutter diameters the abrasion performance (deburring thickness) increases.

Does a secondary burr arise when deburring with conical bits?

Whether a secondary burr arises and how thick it is normally depend on the deburring cutter that is used as well as on the various adjustment parameters.
When processing aluminium as well as various other materials the use of coolant reduces the formation of secondary burrs.

If there is a requirement for absolutely burr-free edges, we offer appropriate tool solutions with an integrated brush, whereby the deburring and smoothing of any secondary burr take place in a single working process.

Our workpieces require deburring of precisely 0.5 x 45°. Is this possible with engraflexx?

The milling of precisely defined chamfers is possible, although this requires special milling cutters with an integrated side stop.
Appropriate special milling cutters can be acquired from us ex stores.

Can the tools also be used to produce smooth run-out radii?

The milling of smooth run-out radii is possible, although this requires special milling cutters with an integrated side stop.
Appropriate special milling cutters can be acquired from us ex stores.

What is it necessary to consider when selecting the milling cutter?

It is essential to note that milling bits are always inserted in the tools, in the same way as these are used in hand-held grinders.
Milling bits in standard versions can be used for many applications. However, this does not always produce the desired result. Depending on the deburring quality required or the respective machining material, it may be expedient to use reworked or specially produced milling bits.

We shall be happy to assist you with the requisite information, please get in touch with us.

How great is the wear on the router bits?

Experience has shown that the wear on the milling bits is almost insignificant.
Even if used in three-shift operation, it is usually only necessary to replace them after a number of weeks.

Is periodic maintenance work required on the engraflexx?

No, the operation of all deburring tools we produce is completely maintenance-free.
However, it is necessary to ensure that the maximum permissible spindle deflection is not exceeded.

The dimension of the deburring is uneven

This can have various causes, which can be remedied as follows:

  1. The lateral distance position was not correctly adjusted
  2. The programmed feed speed is not reliably adhered to by the machine with major changes in direction
  3. Feed speed is generally too slow

This can usually be rectified with ease by optimising the machine parameters.
Please get in touch with us if you require technical support!

 

The dimension of the deburring is even, but too small

This can be rectified as follows:

  1. Increase lateral contact pressure (knurled nut on engraflexx)
  2. Reduce feed speed

Both measures do not lead to the desired results?
Please get in touch with us if you require technical support!

The dimension of the deburring is even, but too large

This can be rectified as follows:

  1. Increase feed speed
  2. Reduce lateral contact pressure (knurled nut on engraflexx)
  3. Reduce spindle speed

None of the measures led to the desired result?
Please get in touch with us if you require technical support!

The deburring is regular, but the aesthetic quality is inadequate

The following always applies: in particular with engraflexx EC tool types with lateral deflection, it is not possible to achieve the same visual surface quality as with securely clamped deburring millers.
This is due to the characteristics of the deflecting spindle. However, due to the often very small deburring thickness, these visual quality defects are insignificant in the majority of cases.

If you require higher deburring quality then this is possible with a range of measures.
Please get in touch with us if you require technical support!

 

The deburring is highly unsatisfactory and exhibits intermittent milling grooves

This phenomenon can arise in particular with the use of engraflexx EC- tool types and can be caused by the following:

  • the spindle has met with the deflection boundary
  • the deburring mass is too great
  • the milling bit used is not optimally tailored to the material

Please get in touch with us if you require technical support!

When is the version with radial spindle deflection, or the version with axial spring-mounted spindle used?

This decision depends on a wide range of criteria and is not always simple.
That is why we always have an initial discussion on the telephone with every new interested party. Due to our many years of experience, we are then able to recommend the optimum respective tool type for the customer.

Please get in touch with us if you require technical support!

Gravostar Faqs

FAQs summarised for download

The FAQs of the engraflexx deburring tools conveniently in a PDF for downloading

Download PDF now

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decision for the best

With our products, as well as our consulting competence, we help our customers to increase productivity, quality and process reliability of their production. We support you in advance in the selection of the optimal tool type.

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decision for the best

Mit unseren Produkten, wie auch unserer Beratungskompetenz helfen wir unseren Kunden, Produktivität, Qualität und Prozess-Sicherheit ihrer Produktion zu erhöhen. Dafür unterstützen wir Sie bereits im Vorfeld bei der Auswahl des optimalen Werkzeugtyps.

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