"Stormin Mormon" wrote in message
...
I think different metals or woods, different speed
and feed. For many metals, fast is better. For
example, thick aluminum works better for me,
with high speed and very gentle feed pressure.

Most steel, for me, high speed is better. High
pressure, to start, and then lighten up.

Agreed, but I've had good success with fast speeds on most woods, to avoid
splintering/chipping and slow speeds on most metals, especially aluminum.
Aluminum being soft is easy to drill at slower speeds, though, I can see
using faster speeds on it due to that softness.