Spindle speed seems way low, feeds are probably not bad depending on the flutes.

Best bet is to copy the xml from your machine, that way it will (or should) simulate exactly as the machine does.
Hood

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.

Yes that sounds about right
Just finished doing an actual run through and the simulated time and the real time differes by 3 secs

Hood