What is the fastest feed rate I can run on a 80mm spindle?
That depends on what tool you are using and what material you are cutting and at what depth per pass and what finish you wish to achieve — like most things in life, it’s a trade-off (actually, a series of them).
The community has worked up some notes on the principles at:
and there are some videos discussing these concepts in various materials at:
Running finish pass
Start at 10mm max depth 11mm for finish pass
Running a 1/2 bowl bit
But simple question how fast can I push machine in software
If no other aspects of the cut are limiting, then the max speed for a feed rate on an SO5 Pro w/ current firmware settings, motor, and electronics is 200 ipm as discussed at: