Sandvik Coromant Threading - Manual (Page 49)

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3. Products - thread turning
The unique guide-rail interface between the insert and tip seat
eliminates insert movement caused by cutting force variation.
CoroThread 266 therefore provides accurate and repeatable thread
profi les as a result of rigid insert stability.
Insert with slots for rail guide
Shim with rail guide
The insert-rail support system solves the
problem of insert movement, which is often
caused by substantial forward- and reverse
cutting forces when entering and exiting the
thread.
The interface: holder - shim
The screw locks the insert securely in the
pocket, at the blue contact faces.
The interface: shim - insert
Cutting forces are distributed along the
back wall of the tool holder, indicated in red.