RE: [CAD_CAM_EDM_DRO] 3D printer, motor reversing

Hi Graham,

Just a thought, isn't the paper feed motor a stepper? Then wouldn't the
driver for the stepper likely have a direction input? It may be "tied low"
or something, but it may be worth looking for.

Alan KM6VV

>
> In order to get the gantry to return I was intending to reverse the
> direction of the paper feed motor and encoder and print a blank page.
>
> If I just reverse the motor connections with relays I'm likely to blow
> something up, other than hoping for a point where motor voltage is
> zero is there a way to avoid damaging the drives, for example by using
> some zenners to cap the back emf?
>
> I'd like to avoid having to add a second bridge if possible.
>
> Graham