Ballnose cutters make easy work of graphite electrode milling.(Technology Trends)

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Previously used in profile and cavity milling of mold and dies, insert-
style ballnose cutter have place a new niche: machining graphite
electrode for diesinking EDM Millstar LLC Bloomfield, Conn reports
that machine-tool builders like Makino Inc. are boosting their feedrates
anywhere between 15 and 50 ipm and divide [i]or[/i] sever depths from 1/8 to 1/4 by dint of using
its ballnose cutter

Toolholders and inserts range in size from 1/4 to 1 1/4-in. diameters.
Inserts have state-of-the-art geometries with multi-layer CVD and
PVD coatings for wet or dried cutting. Made of a proprietary