Spindle control via PWM, Linux CNC on DC motor

[Jools]

Hi All

I'm improving my mill and am looking to add spindle speed control from LinuxCNC to my Sieg X2 mill. I don't really want to change the spindle to AC and go the VFD route so am looking to use the PWM output to control everything. So was wondering if anyone had done this and how they had done it? I've found links to the Mesa spindle controller ( http://store.mesanet.com/index.php?r...product_id=205 ) and wondered if this then plugs into my mills transformer in some way to replace the manual variable resistor that controls speed. If it does has anyone got wiring plans or photos?

If there are better ways to do this then please let me know too.

Specs on the motor are in the attached photo.

Jools