Re: Stepper driver question (slightly O.T.)

Marv,
There are lots of ways to do this, but it is a fairly simple problem
electronically. I would be happy to help you work out a solution if you want
to contact me offline.
Phil Mattison
mattison20@...

----- Original Message -----
From: "Marv Frankel" <Dcdziner@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, January 30, 2006 2:57 AM
Subject: [CAD_CAM_EDM_DRO] Re: Stepper driver question (slightly O.T.)


> 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
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> <dave_mucha@y...> wrote:
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Marv Frankel" <Dcdziner@p...>
> > wrote:
> > >
> > > Guys,
> > > I have an industrial application that requires only one stepper
> > > motor, and two photocells. When one photocell goes dark, the stepper
> > > motor cranks clockwise. When the other photocell goes dark, the
> > > stepper motor cranks counterclockwise. I'm looking for a fairly simple
> > > driver. Any suggestions?
> > >
> > > Marv Frankel
> > > Los Angeles
> >
> >
> > It sounds like your machine has an ON/OFF setting. no signal at all
> > and it is OFF.
> >
> > any signal and it is ON.
> >
> > ONE of the signals ALSO changes state of the DIR pin.
> >
> > Very simple to do, but the logic and electronics may not be on topic
> > for the list.
> >
> > the motor and driver parts seem pretty close though.
> >
> > What size motor ? how much power do you need ? (have?)
> >
> > It sounds somewhat similar to Mel Bartels's telescope stuff (CNC to
> > move a telescope)
> >
> > Alan is correct that a PIC could handle this, but so could a 555 and a
> > comparitor.
> >
> > The comparitor would report when either input went high. and also
> > report when that one went high so as to necessitate a DIR change.
> >
> > With the signal, the 555 would just start pulsing away.
> >
> > If you were running TurboCNC or some such, you could feed those
> > signals into inputs and run G-Code to make the thing move.
> >
> > Dave
> >
>
>
>
>
>
>
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