"Ignoramus11030" wrote in message
...
On 2009-06-28, Joseph Gwinn wrote:
When you get into really high-speed cutting, Joe, they often run dry --
or
with a 1/2-liter per 24 hour lean oil (vegetable) mist.

Yeah, that's now true, at least for the 40000 rpm spindle folks.

Most of the machining centers I've seen use a flood though.

How do they keep the cutter cool, then?

i

They don't. They're meant to run very, very hot. The ones with aluminum
oxide coatings count on the heat to sublimate the AlOx layer, which then
insulates the other layers with a film of gas.

--
Ed Huntress