Sandvik Coromant Threading - Manual (Page 32)

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2. Applications – Thread turning
Insert nose radius and tool life
The nose radius is the smallest point on the insert and the most li-
able to break under the extreme pressure of a threading operation.
Nose radii differ considerably for different insert types and consid-
eration should be made to the cutting speed and number of passes
in order to optimize performance and machining security.
NPT and NPTF inserts have the smallest nose radii within the
standard range. For optimized performance increase the number of
passes and reduce cutting speed.
The internal insert has a signifi cantly smaller nose radius than the
external insert.
NPT/NPTF UN/MM