Re: [CAD_CAM_EDM_DRO] Re: voltage based servo controller ?

Stephen Wille Padnos wrote:

> You shouldn't need a "matching" motor. If you can find the current and
> voltage limit, you can find a motor that it's capable of driving (just
> like a gecko, but probably with different limits).
>

But, most velocity servo amps need a tachometer (or encoder->
tach converter).

> Sure. You can use EMC2 with PWM output on a parallel port pin (or other
> supported I/O card). You'll need a little bit of filtering, a resistor
> and capacitor should do it, though you may want to check your parport
> output - it may not be symmetric (so it would take a bit of fiddling to
> get the filter to decay at the same rate as it charges).

This will almost work, but it will be unidirectional. You'd
need additional circuitry (pretty simple, though) to flip the
aritmetic sign of the analog output for the reverse direction.

Jon