RE: [CAD_CAM_EDM_DRO] Re: Stepper driver question (slightly O.T.)

Hi Marv,

ELS has a driver you might be interested in:

http://www.embeddedtronics.com/

It uses the driver chip I mentioned.

I'd go for a "photo-interrupter" switch, not a simple photocell. Much the
same as one might use for a limit switch. The product (is it thin enough to
go through a photo-interrupter switch?) then actuates a switch on either end
of it's "travel" limits. The stepper controller would then generate an
appropriate number of steps to re-align the product.

Alternately, roller-micro switches could be used to sense the approach of
the product's edge.

Alan KM6VV

> Guys,
> To explain a little further, a laminating machine has product
> coming off two rolls and they go through two pressure rollers.
> Sometimes the product on the bottom roll wanders to one side or the
> other, and gets out of registration with the upper product. The
> photocells will detect which way the product is going, and the stepper
> will skew the shaft to center the product.
> The stepper motor is a bipolar 440 oz.in, 4-lead, that will run on
> 24 or 48 volts. Since I'm "electronically deprived", I need the
> controller explained in simple terms. Does anyone have a simple
> schematic for a driver, or point me in the right direction. I know
> that the GRex that Gecko is coming out with will do the job, but I
> think it's slightly overkill for this application.
> Thanks for your help.
>
> Marv Frankel
> Los Angeles