Re: [CAD_CAM_EDM_DRO] 4wire vs 6wire step mtrs also Taig mill S&D conversion

At 18:31 04/02/2002 +0000, you wrote:

> > Another way I can go in doing the conversion to S&D is to
> > use a bank of (4) Pacific Scientific 6410 drivers I have all
> > powered up/wired up/ and ready to go (this has the advantage
> > of letting me add a rotary "A" axis later and keep everything
> > the same). I am using the 6410's to drive steppers which I am
> > installing on my Taig lathe (these are 4 wire motors and work
> > just fine). My question is can I treat the Taig motors
> > as (4) wire motors by just tying both commons together back
> > at the 6410.
>
>No, I think you DON'T want to do that. Assuming the 6410 is a
>bipolar drive, connect one end of each winding and the common
>to the bipolar drive, leave the other winding end disconnected.

You're absolutely right there - if you short out the unused half of the
coil, it will act as a brake against the motor's movement. Not a smart
idea! The right thing, as you say, is to leave the unused coil termination
unconnected.

Regards,
Tony