Re: Driving gantry with two paired stepper motors

Hi Richard,

I can see that a system such as you describe without a direct physical
connection between the two leadscrew could easily get out of phase and thus
bind, however, given enough torque in the motors, this should be a rare
event. As to driving two stepper motors together, I would suggest that you
look at the possibility of using one L297 and driving two L298s with it, one
for each motor. This way you can get full torque to each. I am no
electronics expert but I would imagine that, at worst, you would have to put
some form of simple buffer chip between the step and direction outputs of
the L297 and the inputs of the two L298s, - perhaps one of our electronic
genius' can comment? At least with this method both motors receive the same
step and direction signals at exactly the same time.

Ian
--
Ian W. Wright
Sheffield UK

----- Original Message -----
From: <rumancik@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: 14 January 2000 05:05
Subject: [CAD_CAM_EDM_DRO] Driving gantry with two paired stepper motors


> From: rumancik@...
>
> I have seen someone suggest that you can couple 2
> stepper motors in parallel on a one-axis drive. I
> have tried this with a simple L297/L298 driver
> board. The two motors appear to be staying in
> phase with each other. I realize that you can't get
> the same torque from each motor (as you would if
> driven individually) but if you have a mechanical
> transmission, you also split the torque.
>
>
> My question: are there any potential problems with
> this technique, electrical or otherwise?
>
> -Richard-
>
>
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