How to reduce vibration in metal cutting User Manual

Sandvik Coromant – How to reduce vibration in metal cutting16
Problem solving
Chip jamming:
Use the largest possible amount of coolant as this will help to evacuate
the chips from the groove.
Choose a different geometry to reduce the risk of chip jamming.
Dimension problems (tolerances):
Choose a Silent tool holder which will reduce the vibration max over-
hang is 5 x D.
Choose sharp and positive insert geometry, CoroCut CM or ground
– GF as it enables a smooth cutting action and minimum deflection from
the workpiece.
Make sure the tool is positioned at correct centre height. The deviation
from the workpiece should not be greater than +/- 0.1 mm.
Have the shortest possible overhang for the application to increase the
stiffness of the bar. Max 2 x D for steel bars and max 5 x D for Silent tool
bars. A rule of thumb is never to have a tool overhang larger than 8 x l
a
(insert width).
Choose the largest possible boring bar diameter, to increase stability.
Vibrations (bad surface finish):
Adjust the cutting speed (v
c
) as the frequency of vibration can change
and the vibration eventually can disappear.
Increase the feed slightly as this can reduce the friction created when
grooving and reduce the cutting action. However, this can increase the
deflection (the radial force).
Choose a thinner insert width and make several cuts, especially for the
finishing cut.
Check the clamping of the boring bar.