Feed fingers

feed fingers

art. no. D thread G L max. diameter
Kreis Sechseck Quadrat
207 E 18 M 16 x 1 L 70 12 11 9
217 E 21 M 20 x 1 L 70 16 14 11
220 E 24 M 22 x 1 L 85 18 16 13
236 E 30 M 28 x 1 L 95 24 21 16
237 E 31 M 29 x 1 L 90 25 22 18
254E 42 M 40 x 1 L 116 36 31 25
273 E 60 M 58 x 1 L 140 52 45 36
Highlighted art. no. according to DIN 6344

external feed fingers

art. no. D thread G L max. diameter
Kreis Sechseck Quadrat
242 E 42 M 36 x 1,5 120 30 24 20
259 E 56 M 50 x 1,5 138 42 36 29
278 E 75 M 68 x 1,5 138 60 52 42

Use:

  • as feed fingers for feeding forward workpiece bars in automatic lathes
  • as pick-up collets for moving up workpiece bars on NC lathes for repositioning of workpieces


Bore patterns:

  • smooth
  • on request with round grooves


Hardness:
Feed fingers are made from special spring steel. The front component with the clamping bore has a hardness of approx. HRc 60 – where this is not prevented by the partial tempering. The thread and spring areas are hardened to spring temper.

Feed force:
Feed fingers are supplied sprung together so that, when the dimensions are nominal, they pretension the workpiece rods or workpieces.

The feed force table below gives the reference values. A hardened ground test mandrel with a tolerance of h7 must be used for checking.

Feed fingers with increased feed force can be made for an extra charge.