• Usually spindle speeds above 10000 RPM, but this is highly relative to the cutting tool and work.
• The cutting velocity is higher, but the feed/depth of the cut is reduced, the resulting mrr is still higher.
• Higher spindle speeds call for new low inertia spindle, and tolerances as well. Small tolerance problems can result in unacceptable vibrations at these speeds.
• The table below is an example of some cutting speeds [Ashley, 1995]