4. Thread cutting by dies on simple cylindrical workpieces

Thread cutting by dies produces an external thread. The work-pieces are processed on the external surface.

- Operations are carried out in chucked conditions.

- Often extended chuck jaws are employed in order to ensure true workpiece running and not to damage the surface of the pre-worked parts.

- The die is positioned in the die holder.

- The die is positioned by means of the quill.

Figure 16. Positioning the die

1 die, 2 quill, 3 support for die holder, 4 workpiece

- The first thread turns must be cut by hand.

- After the initial cut machine processing follows with the help of a support for the die holder. (see Fig. 14)

- Ensure proper cooling and lubrication.

- The chip chambers must always be kept clean.

- Turn back the die by hand after having completed the work sequence.

- The thread is checked by means of a thread ring gauge.

Figure 17. Normal thread ring gauge to check an M 16 thread

What is checked by means of the thread ring gauge and what must be heeded?
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