Mach 3 and spindle speed problems

So, the Conect Cadet Plus is a BBC microcomputer-controlled CNC lathe based on a Myford ML-10.  If you’ve got the same one that I have, it has a motor controller board that looks like :

Image

If you’re trying to get it to work with Mach 3, then it will run extremely raggedly on the defaults.  A little investigation shows the following :

Image

Mach 3’s manual recommends a spindle PWM base frequency of 5-10Hz.  For this motor controller, you don’t begin to get linearity until much higher figures : I’m using 120Hz and it works well.

Hope this helps someone else.  It’s the difference between the motor barely working and working well. 

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