> From: Gregg Eshelman via Emc-users [mailto:emc-users@lists.sourceforge.net]
>
> KB makes SCR and PWM motor drives, but rather than spend the $$ for a KB PWM
> I'm leaning towards an MC2100 treadmill drive
> for my JET 9x20 I put a DC treadmill motor on. Just have to build a PWM
> control circuit to replace whatever would be on the
> treadmill control panel.
> The old MC60 treadmill SCR control may or may not be useful for a spindle
> drive, depending on how it's been set up for when it
> will turn on and how it handles fast speed changes and getting close to a
> stall. If it starts up as soon as the control rheostat is
> moved and doesn't quit if slowed down too fast, it'll work but the low RPM
> torque is low. The MC60 that was on the mill my motor
> is from wouldn't start until the knob was turned to 50%, and it'd start *at*
> 50% speed. Then if I turned it down too fast it'd shut
> down until it was power cycled and the knob put back to zero. Useless for a
> lathe spindle, without the knowledge to modify the
> circuitry or adjust the trimpots that may control those behaviors.
>
Probably why I didn't do much with my MC60 controller. It's so long ago I
don't remember it's behaviour. Somehow though your description sounds very
familiar.
John Dammeyer
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