Hood,
Ah! What it calls spindle speed is not spindle speed, it's VFD frequency. That is also set manually at the moment. I was running around 380RPM with a 1/2" end mill, which is right around 50SFPM. That's reasonable, no?
The simulation is working now, just don't ask me why. I re-started Mach a few times, and it started behaving! Go figure!
Regards,
Ray L.