"Pete C." fired this volley in news:51656994$0
:

Vey cool, but "relatively low cost" scares me. Any idea what these sell
for and where?

Pete, the more I look at those, the less I think they'd be well suited to
milling where one must control chip loads. Although they spin to
enormous RPMS, they are not speed regulated under loads.

I think they'd do fine for fragile, brittle materials where chip loads
are secondary to just cutting through the stuff (like PM said... mother
of pearl, or fiberglass PCB material), but wouldn't work well at all
cutting aluminum.

They're made specifically for grinding, where speed is important, but
tight regulation of speed not as much.

LLoyd