Re: What about a Stepper with Encoder?

Dear Sir:
Here is a possibility; my steppers have extended shafts on which are
placed encoders, 500 count which will give me .001 inch resolution.
Since the steppers are driven by 10x microstepping, one could compare
the pulse input and encoder output to determine if steps were lost.
With microstepping you can rotate the stepper motor +/- 5 steps
before losing sync! If you set a limit of +/- 3 steps as a threshold,
you could either shut down OR keep track of the accumulated error. I
haven't tried it yet but the idea seems good.
Regards,
Jack C.

> Someone posted a link to US Digital on another topic so I surfed

over and

> found heaps of stuff about Encoders ie that can be fitted to

various shafts

> for motion data.
>
> Here is my question.
>
> Considering the cost of servo motors with encoders is quite

astronomical,

> what about a stepper motor say in the hi torque 34 42 NEMA size

with encoder

> from US Digital to over come the problem when a stepper loses steps.
>
> But which controllers and drivers are compatible to accept encoder
> feedbackloop while driving a stepper?
>
> Regards Jess
>
>
>
> --
>