The diagram applies under the conditions
that the workpiece is retained on the machine
tool table by frictional forces between the table
and the workpiece, generated by the clamping
force FSp acting on the workpiece normal
to the machine tool table. The force FSp is just
large enough to prevent slipping of the workpiece
caused by cutting forces. Machine tool
efficiency is assumed to be 75% and the
friction coefficient between table and workpiece
= 0.2. It is required to multiply the
clamping force FSp with a correction coefficient