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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.

Chip thinning due to the cutting edge of a FF
milling cutter is the arc of a great circle (or the
chords that approximate the arc), making the
cutter a toroidal tool. The latter being rotated
around their axis produces a torus or ring-shape.
A typical representation of a toroidal tool is a
milling cutter carrying round (button) inserts.

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

8 ISCAR