Cause
a) Too short, hard
b) Too long
Solution
a) Increase cutting speed
Decrease feed
Change geometry to a more open chip breaker (L-K, L-WK)
b) Increase feed
Decrease cutting speed
Change geometry to a more closed chip breaker (L-F, PF)
Tool vibrations
Cause
a) Cutting force too high
b) Tool length/coupling size ratio too high
c) Unstable conditions
d) Feed too high
e) Speed too high
f) Friction instead of clean cutting action
Solution
a) Choose a light-cutting insert (L-K)
Use smaller nose radius
Choose sharp cutting edges with thin coating or uncoated
Wiper or L-F inserts are not recommended for long overhangs or unstable
conditions
Choose a smaller nose radius
Decrease depth of cut
b) Use largest possible coupling size
Shorten the assembly if possible
Use damped boring tools (Silent Tools)
c) Ensure rigid clamping with face contact to spindle
Check workpiece clamping
Check that all units in the tool assembly are assembled correctly with
correct torque
Check machine spindle, clamping, wear etc
d) Decrease feed
e) Decrease cutting speed
f) Increase depth of cut
Cause
a) Vibration
b) Feed marks
c) Worn insert
d) Surface damage from chips
Solution
a) Reduce speed. See above for additional solutions
b) Use L-WK or L-F geometry (not for 391.37 A / B, long overhangs or
unstable conditions)
Use larger nose radius
Decrease feed
c) Change cutting edge. For how to avoid specific wear patterns, see General
turning
d) Improve chip breaking