Those numbers look about right. The only things I would add a

1. Use cutting fluid. Even motor oil helps quite a bit if you don't have
access to the "real stuff". Just avoid the fumes if possible as it smokes.

2. If you start to get chips iin any color other than silver, slow down
either the feed rate or RPM. The chips will discolor before the tool is
ruined because the chips are actually colling the tool end as they go by...
Hard to imagine, but they are... But eventually, that tool tip will
overheat and stop working.

If you ever need RPM guidelines, you can cound on the MHandbook. Although I
suually suggest RPMs that are around 10% less than what they do for
customers as people tend to mess a perfect environment up every time.

Regards,
Joe Agro, Jr.
http://www.autodrill.com
http://www.multi-spindle-heads.com
..