High tangential cutting forces due to:
Cause
a) Insert geometry creating high cutting forces.
b) Chip breaking is too hard, producing high cutting forces.
c) Cutting forces vary or are too low due to small depth of cut.
d) Tool is incorrectly positioned.
e) Instability in the tool is due to long overhang.
f) Unstable clamping offers insufficient rigidity.
Solution
a) Select a positive insert geometry.
b) Reduce the feed or select a geometry for higher feeds.
c) Increase the depth of cut to make the insert cut.
d) Check the centre height.
e) Reduce the overhang.
Use the largest bar diameter.
Use a Silent Tool or a carbide bar.
f) Extend the clamping length of the boring bar.
Use EasyFix for cylindrical bars.