Sandvik Coromant Threading - Manual (Page 26)

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2. Applications – Thread turning
Insert clearance angles
Two types of angular clearance between the insert and thread are
necessary for precise, accurate threading. These are:
• Flank clearance
• Radial clearance
Flank clearance Radial clearance
Flank clearance
Cutting edge clearance between the sides of the insert and thread
fl ank is essential to ensure that tool wear develops evenly, to give
consistent, high quality threads. The insert should therefore be
tilted to gain maximum symmetrical clearance from the fl anks (fl ank
clearance angle).
The tilt angle of the insert should be the same as the helix of the
thread, to ensure success.
Flank
clearance