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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

7. Straight knurling of convex parts

With this technique attention is to be paid to the following:

- Mostly the workpiece is clamped in hard chuck jaws.
- Concave knurling is mainly applied for straight knurling of control knobs.
- The knurling wheel is fixed in the holder by an unhardened steel pin.
- The possibilities of application depend on the width of the portion to be knurled and the concave knurling wheels available.
- 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.
- The knurling wheel must be clean.
- The workpiece is to be chamfered after knurling.
- The knurling is checked by visual inspection.

Figure 19 Control knob

1 gripping surface