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CLOSE THIS BOOKKnurling - Course: Techniques for machining of material. Trainees' handbook of lessons (Institut fr Berufliche Entwicklung, 19 p.)
VIEW THE DOCUMENT(introduction...)
VIEW THE DOCUMENT1. Purpose and meaning of knurling
VIEW THE DOCUMENT2. Design and types of knurling tools
VIEW THE DOCUMENT3. Preparation of knurling
VIEW THE DOCUMENT4. Straight knurling of small widths on simple cylindrical parts
VIEW THE DOCUMENT5. Spiral knurling of small widths
VIEW THE DOCUMENT6. Cross knurling of small widths
VIEW THE DOCUMENT7. Straight knurling of convex parts
VIEW THE DOCUMENT8. Spiral knurling of big widths

1. Purpose and meaning of knurling

Cylindrical parts, such as screw heads, round nuts, gripping surfaces on measuring tools and all kinds of handles or grips which have to be gripped firmly, must have roughened gripping surfaces. Good grip of such gripping surfaces of operating elements is ensured by providing them with knurled portions. According to the patterns produced, the knurled portions are called straight knurling, cross knurling or spiral knurling.

Figure 1 Straight knurling

Figure 2 Cross knurling

Figure 3 Spiral knurling

This non-cutting technique is no real turning operation. As an embossing operation it belongs to the metal forming techniques, but it is done on the lathe and is a very simple and cheap method.

Gripping surfaces thus produced are sufficient in terms of

- accuracy to size
- shape (good grip)
- surface finish and
- fit.