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Internal thread whirling

Chip breaking operation when an angled cutting tool mills the internal thread of a rotating workpiece.

Illustration of Internal thread whirling

The process

The workpiece is clamped in a rotating chuck which slowly rotates during machining time. An angled milling tool is positioned against the inner wall of the workpiece and moved axially along the surface which results in an internal thread being milled.

Advantages and disadvantages
In comparison with alternative methods
Accuracy of the profile, only one step required to produce internal threads
Limited length of thread
expensive tools