Manual Thread Cutting - Course: Technique for manual working of materials. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 22 p.): 1. Purpose of thread cutting

Manual Thread Cutting - Course: Technique for manual working of materials. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 22 p.)

		(introduction...)
		1. Purpose of thread cutting
		2. Kinds of threads
		3. Tools for internal threading (tapping)
		4. Tools for external threading
		5. Operation of thread cutting
		6. Special hints on the designation of threads by the example of the metric threads
		7. Technological process of cutting internal threads (tapping)
		8. Technological process of cutting external threads

1. Purpose of thread cutting

Thread cutting is cutting of helical turns of threads out of the tapping-size hole or bolt in order to create screwed connections.

Figure 1 - Thread cutting

A complete screwed connection requires an internal thread and a matching external thread as a counterpart. With single-piece manufacture or with repair work, manual thread cutting is a necessary working technique, because - due to technical and economical reasons - machines cannot be used in every case.