Sandvik Coromant Silent tools - How to reduce vibration in metal cutting - Manual (Page 48)

Sandvik Coromant – How to reduce vibration in metal cutting 44
Tooth pitch:
When machining with long tool over-
hangs or unstable conditions, it will have
a positive effect using a coarse pitch (L)
cutter.
Sometimes it can be a good idea to
remove some of the inserts (e.g remove
two inserts from a four inserts cutter).
Milling direction:
Down milling is the first choice for most
machining operations. In some cases,
when the machine has insufficient power,
the workpiece is very pliable, there is
play in the table feed or vibrations arise
during machining, up milling is the best
choice. When up milling, remember
that the cutting force tends to lift the
workpiece up from the work table. This
must be counteracted when clamping
the workpiece.
Position/diameter:
In general, when face milling, the cutter
diameter should be 20-50% larger than
the cutting width. The cutter should be
positioned slightly off centre. Do not
position the cutter dead centre.
When the cutter diameter is smaller
than the workpiece, it is recommended
that maximum width of cut is 60-70%
of the cutter diameter.
In full slot milling, it is very important
to reduce the number of inserts to avoid
vibrations.