With this technique attention is to be paid to the following:
- The workpiece is mostly chucked in internally turned chuck jaws because material with low mechanical strength is knurled.
- The pressing force depends on the material of the workpiece. If necessary and possible, a live centre is to be used as counter-support.
- The knurling wheels are fixed in the holder by unhardened steel pin.
- The knurling wheel must be clean.
- The knurling holder is to be clamped (approx. 1 mm) below centre and at right angle to the workpiece axis.
- By operating the cross-slide screw, the tool is pressed against the workpiece.
- If possible, the knurling should be produced in one feed setting.
- Good lubrication is to be ensured. Attention! The materials knurled (e.g. plastics) have other properties than steal!
Sticky or smeary lubricants are not to be used.
- The workpiece is to be chamfered after knurling.
- By visual inspection the knurling is checked.
Firm and safe clamping of the workpieces is essential because of high pressing forces generated in chipless forming.