Page 8 - Iscar_Article_Brochure
P. 8

(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




                               8
   3   4   5   6   7   8   9   10   11   12   13