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		Knurling - Course: Techniques for machining of material. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 19 p.)
			(introduction...)
			1. Purpose and meaning of knurling
			2. Design and types of knurling tools
			3. Preparation of knurling
			4. Straight knurling of small widths on simple cylindrical parts
			5. Spiral knurling of small widths
			6. Cross knurling of small widths
			7. Straight knurling of convex parts
			8. Spiral knurling of big widths

6. Cross knurling of small widths

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.