Guys got my newest cnc mill running under computer control.  I ran the roadrunnersmall.tap program and mudflapgirl.tap programs with a pencil on a collet.  All worked well and now I am understanding mach again.  Next question is how to set acceleration again.  Well how do I tune my motors to mach3?  Will post videos after I get the tuning done...  

I am trying to follow section 5  in the Mach 3 install and config pdf

Afraid tuning motors is all trial and error, unless someone has exactly the same machine with same motors and drives there is no way to give you settings.

Best thing is put the Accel fairly low and keep increasing the Velocity until you get missing steps (motors squeal) then back off 50% and start increasing the Acceleration until the same happens then back off that a bit. Then you just have to mess around with both until you find the best of both worlds that your machine is happy with.

Hood

Buffer load seems to have a bearing on this as well, mine is much more prone to crap itself and squeal the motors if the buffer load approaches or reaches 100%. Find this on the diagnostics screen, right in the middle.

do you have to have the motors mounted on the machine?  I just see the ability to rapid would change from bench testing with no inertial weight to machine testing with table moving behind the motor.