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(usually 10-17°) meets the requirements of chip
thinning and total cutting force. Ensuring the
geometry of solid carbide fast feed endmills and
replaceable milling heads demands the specific
shape of a cutting edge, while in indexable
milling it may be provided by the appropriate
location of an insert of even simple profile.

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 it 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.
But if 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 required thickness. The same situation is
observed in ball-nose milling tools, and explains
why FF cutters run so fast. ISCAR offers a wide
variety of fast feed milling families that represent
different classes of indexable tools, solid carbide
endmills and solid carbide interchangeable
heads with Multi-Master threaded connections.

A popular example is the ISCAR HELIDO
600 UPFEED LINE, a real workhorse for fast
feed milling. Although this commonly used tool

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