Quote Originally Posted by Jonathan View Post
You've said the reason for wanting 1000rpm is for a fly cutter ...
For mild steel, 1000rpm is 32mm cutter diameter... 1mm depth of cut, 155mm/min, power is 63W
For aluminium, 1000rpm is 140mm cutter diameter...1mm depth of cut, 310mm/min, power is 38W
Doesn't it also depend on the width of the cut or am I missing something?

Russell.