DRAW-IN COLLETS

USE OF DRAW-IN COLLETS

Draw-in collets are used for workpiece clamping as well as in all common grinding machines, dividing heads and manual turning machines.
Clamping is performed by retracting the draw-in collet into the collet sleeve.

dShaft-Ø
AHead-Ø
LTotal length
KTaper angle
GThread
FShape
Articleø d
[mm]		ø A
[mm]		L
[mm]		K
[degree]		GF
min. – max. [mm]
      
E3241521,55320M13x11,0 – 9,02,0 – 6,52,0 – 8,0
E34092028908Tr.20×1,52,0 – 14,5PRPR
E35120288020Tr.20×1,51,0 – 15,02,0 – 10,52,0 – 13,0
E358233281,520M21x11,0 – 16,52,0 – 11,02,0 – 14,5
E359233289,520Tr.23×1,51,0 – 18,02,0 – 12,02,0 – 16,0
E3632533,58416M23x11,0 – 17,52,0 – 12,52,0 – 15,5
E366283610018Tr.27×1/20″1,0 – 21,02,0 – 15,02,0 – 18,0
E367283810020Tr.28×1,51,0 – 22,02,0 – 15,52,0 – 19,0
E38531,7537,58310Außen: 31,45×1/20″
Innen: 26,44×1,058		1,0 – 25,02,0 – 17,52,0 – 21,5
E386324511020Tr.32×1,51,0 – 27,03,0 – 19,03,0 – 23,5
E666253559,520M25x13,0 – 20,0PRPR
K2020288020Tr.20×1,51,0 – 15,02,0 – 10,52,0 – 13,0
K23233289,520Tr.23×1,51,0 – 18,02,0 – 13,02,0 – 16,0
K32324511020Tr.32×1,51,0 – 27,04,0 – 19,03,0 – 23,5
K45456014020Tr.45×25,0 – 36,55,0 – 26,05,0 – 32,0
KDT385870,39915M50x1,510,0 – 38,08,0 – 26,08,0 – 32,0

DRAW-IN COLLETS CLAMPING SURFACE DESIGNS

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GROOVED

  • With additional grooves

AXIAL & RADIAL GROOVES

  • Higher clamping force compared to the grooved standard collet due to the additional axial grooves

SUPERGRIP

  • Highest clamping force at the same clamping pressure of the machine due to very closely spaced axial grooves
 

CARBIDE COATING

  • Carbide coating possible for all shapes
  • Higher coefficient of friction than a standard collet
  • Higher clamping force
  • Repeated / afterward coating possible

EXTENDED CLAMPING LENGTH

  • Can be used for long workpieces with multiple grooves
  • Higher wrap around at the workpiece perimeter, therefore more force to clamp
  • More stable clamping for long workpieces

SHORTENED CLAMPING LENGTH

  • Application for workpieces whose geometry behind the clamping diameter shouldn’t be damaged
  • Used for short workpieces so the ejector can be lead closer to the clamping diameter

ZUGSPANNZANGEN FORMEN

SQUARE

  • Suitable for clamping square material

HEXAGON

  • Suitable for clamping hexagon material

SPECIAL PROFILES

  • Various profiles can be realized by ram EDM or wire EDM
  • Profiles can be adapted individually to the workpiece

SPECIAL CONTOURS

  • Complex contours can be realized by hard milling, hard turning and grinding
  • Already possible with smallest diameters from 0.2 mm

ECCENTRIC

  • Eccentric bore can be eroded individually according to application
  • Through hole or offset hole is possible

STEP BORES

  • Step bores are suitable for simultaneous clamping of several diameters of a workpiece
  • Very high precision as both step bores are ground in one step

INNER CONICAL

  • For clamping conical workpieces
  • The taper angle of the collet is precisely adapted to the workpiece

DRAW-IN COLLETS SLOT DESIGNS

S-SLOT

  • High and constant clamping force
  • Clamping with virtually no clamping marks
  • Alternatively usable for profile material (corner clamping)
  • Prevents the entry of machining chips, as the collet closes almost completely
  • Easy to clean after use

L-SLOT

  • High and constant clamping force
  • Clamping with virtually no clamping marks
  • Alternatively usable for profile material (corner clamping)
  • Prevents the entry of machining chips, as the collet closes almost completely
  • Easy to clean after use
  • Ideal for clamping short clamping surfaces

W-SLOT

  • High and constant clamping force
  • Clamping with virtually no clamping marks
  • Alternatively usable for profile material (corner clamping)
  • Prevents the entry of machining chips, as the collet closes almost completely
  • Easy to clean after use

Z-SLOT

  • High and constant clamping force
  • Clamping with virtually no clamping marks
  • Alternatively usable for profile material (corner clamping)
  • Prevents the entry of machining chips, as the collet closes almost completely
  • Easy to clean after use
 

 

 

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DRAW-IN COLLETS WEAR REDUCTION

CARBIDE INSERT

  • High wear resistance
  • Prevents pressure marks on the workpiece
  • Higher service life

BL COATING

  • Smooth surface
  • Fewer clamping marks on the material
  • Especially suitable for material with poor gliding properties
  • Prevents the welding of the material in the collet

PREMIUM BLUE COATING

  • Economical alternative to collets with carbide insert
  • High wear resistance
  • Can also be used for special shapes
  • Are completely coated on the functional surfaces like cone and shaft therefore more durable

DRAW-IN COLLETS ADDITIONAL VERSIONS

INTERNAL STOP

  • Suitable for manual loading of the machine at a certain length
  • Prevents the displacement of the workpiece at high axial forces
  • Used to stabilize the workpiece when the clamping length is too short

INSERT AID

  • Is inserted in main spindle collets
  • Is mainly used for small diameters
  • Minimizes vibrations as the bar material is supported along its total length

BUSH

  • Is inserted in main spindle collets
  • An alternative to the insert aid
  • Is mainly used for medium to large diameters
  • Absorbs the vibrations of the bar material, supports it at the back and keeps it axially aligned

 

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SUPPORTING BUSH

  • Minimizes vibrations as the bar material is supported along its total length and keeps it axially aligned
  • Ejection is made possible in a process-safe way

EJECTOR & INNER COOLING

  • Mechanical ejection of the workpieces
  • If required internal cooling of components can be integrated
  • For flushing the clamping surface
  • Simple change of the ejector within one collet type possible

UP VERSION

  • High precision

UUP VERSION

  • Highest precision

SEALED

  • Prevents the entry of machining chips
  • The whole slot area can be sealed
  • Resealing possible
  • Not usable with high pressure flushing in the machine

DRAW-IN COLLETS INSERTS

PEEK / PLASTIC INSERTS

  • Prevents pressure marks on the workpiece
  • Inserts are replaceable when worn
  • Ideal for scratch-sensitive materials, as well as for gentle gripping

ALUMINIUM INSERTS

  • Prevents pressure marks on the workpiece
  • Inserts are replaceable when worn
  • Ideal for scratch-sensitive materials, as well as for gentle gripping

BRASS INSERTS

  • Prevents pressure marks on the workpiece
  • Inserts are replaceable when worn
  • Ideal for scratch-sensitive materials, as well as for gentle gripping

BRONZE INSERTS

  • Prevents pressure marks on the workpiece
  • Inserts are replaceable when worn
  • Ideal for scratch-sensitive materials, as well as for gentle gripping

 

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INSERTS FOR SELF-TURNING

  • Clamping diameter can be reworked by the user himself
  • Inserts are replaceable when worn
  • Ideal for scratch-sensitive materials, as well as for gentle gripping

DRAW-IN COLLETS VERSIONS

LONG NOSE

  • Are used for workpiece clamping
  • Better accessibility to the workpiece