Page 6 - FAST FEED MILL Brochure_metric 2022

Although the introduction of innovative carbide
grades and advances in the form of rake faces
has further improved progress in FF milling
cutters, the essential element of fast feed
milling – geometry – remains constant.

The cutting edge of a FF milling cutter is
the arc of a great circle (or the chords that
approximate the arc), and therefore the
cutting edge angle of the cutter is not a
constant value but varies depending on the
axial depth of cut from 0 to 90°. Decreasing
depth reduces the cutting edge angle resulting
in thinner chips. The programmed feed per
tooth for a cutter with round inserts relates to
the maximal diameter of the cutter, i.e. to the
maximal depth of cut (it is equal to the insert
radius) and the maximal cutting edge angle.

Id the cutter mills under the maximal
depth, the chip is thinner; and therefore
the programmed feed should be increased
correspondingly in order to produce the
chips of the required thickness. The same
situation is observed in ball-nose milling tools,
which explains why FF cutters run so fast.

6