Nann Workpiece Clamping Collets - Draw-Back Collets

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Work Piece Clamping Solutions

Nann Workpiece Clamping Collets - Draw-Back Collets

QUANTITY

Draw-Back Collets

Use:

  • for workpiece clamping on finishing lathes, grinding machines and indexing units
  • small axial movement of the collet during the clamping process
  • suitable for very short workpieces, because the power is transferred from the clamping sleeve taper to the taper of the collet on their front part.
  • stops can be supplied
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Bore patterns:
smooth

Mounting sleeves:
Mounting sleeves according to DIN 6341 or something similar are available for the drawback collets. When making an inquiry or an order, please supply us with details on the mounting taper and type of collet.

Taper angle of the clamping sleeve:
The taper of the clamping sleeve should be 15’ (one-sided) flatter than the taper angles given in the tables. This frees the collets on release.

Hardness:
The collets are made from a special spring steel. Where possible, by partial tempering, the hardness of the taper and clamping bore is approx. HRc 60.

Taper grinding:
For some types the clamping taper is lightly ground at the slot edges to ease removal of the collet from the mounting taper thus making possible low undersized clamping.

Extended collets (long-nose collets):
If the collet has to be extended towards the front in order to support the workpiece, it must be ensured that the clamping point reaches into the taper of the collet. If the clamping point lies in front of the collet taper, the nose of the collet will open towards the front. Under these circumstances, running concentricity (truth) will no longer be guaranteed.

 

Stops for collets:
Adjustable stops which are easily fitted into the rear bore of the collet are available for standard models.

art. no. pic. d D L thread G max. diameter
        Kreis
302 E 1 8 13 34 20 6,85 x 0,625 6
303 E 1 9,3 15 50 21 8,25 x 1/32“ 7,5
313 E 1 10 14,5 73 20 M 9,2 x 1 8
314 E 1 10 14 41,5 15 S 9.83 x 0,833 8
318 E 1 12 16 43,5 15 S 11,75 x 1,25 10
319 E 1 12 18 60,0 20 Tr 12 x 1 10
3213 E 1 15 20,2 58,3 15 14,75 x 1,25 12,5
324 E 1 15 21,5 53,0 20 M 13 x 1 13
330 E 1 16 24 70,0 20 Tr 16 x 1,5 13
349 E 1 20 26,3 69,0 15 S 19,7 x 1,667 20
350 E 1 20 27,5 117,0 20 M 18,5 x 1,4 18
351 E 1 20 28 80,0 20 Tr 20 x 1,5 17,5
354 E 1 20 28 117,0 17,5 19 x 1/20“ 17,5
355 E 1 20 28 117,5 17,5 S 20 x 2 18
358 E 1 23 32 82,0 20 21,1 x 1 20
359 E 1 23 32 90,0 20 Tr 23 x 1,5 20
369 E 2 24,12 32 101,5 8,5 7/16“ x 1/20“ 20
363 E 1 25 33,5 84,0 16 M 23 x 1 22
364 E 1 25 34 92,5 15 S 25 x 1/15“ 22
366 E 1 28 36 102,0 18 Tr 27 x 1/20“ 25
367 E 1 28 38 100,0 20 Tr 28 x 1,5 24
385 E 1 31,75 37,5 83,0 10 31,45 x 1/20“ 26
3713 E 1 32 40 100,0 15 S 29,7 x 1/15“ 30
386 E 1 32 45 110,0 20 Tr 32 x 1,5 29
3838 E 1 45 53 109,0 15 M 42 x 1,5 40
389 E 1 45 60 140,0 20 Tr 45 x 2 40
390 E 1 47 60 110,0 20 Tr 47 x 1,5 42

Highlighted art. no. according to DIN 6341

draw4

art. no. d D L thread G max. diameter
        Kreis
637 E 16 24,5 58,0 24 M 16 x 1 12
666 E 25 35,5 67,0 20 M 25 x 1 21
667 E 36 46,5 72,5 20 M 36 x 1,5 31
668 E 50 62,5 98,0 20 M 50 x 2 43
669 E 60 73,5 101,0 20 M 60 x 2 52

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