Re: [CAD_CAM_EDM_DRO] stepper pulser, and RE: Stepper driver question (slightly O.T.)

There may be logic states that you want to accomodate as well that are
simple in a PIC but complicated in a BEAM type control - such as power up,
power down, and various failure modes such as simultaneous true from both
sensors.

Alan,

I have been considering a similar device using a PIC to the one you're
working on. (One of my applications is a Solar array tracker.) Please let me
know when you have a design.

Thanks,

D.

----- Original Message -----
From: "Alan Marconett" <KM6VV@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, January 30, 2006 9:52 AM
Subject: [CAD_CAM_EDM_DRO] stepper pulser, and RE: Stepper driver question
(slightly O.T.)


> HI Dave, Marv,
>
> You're right! The 555 timer circuit posted in the files could ramp a
> stepper up. Add comparators, and you might have it.
>
> But just changing directions may not be enough. Some hysteresis may be
> required, so that the device does not "hunt". How wide would the "dead
> band" (area between limits where no motor activity is desired) be? I
> suppose if a "limit" (photo detector, what type?) was reached, one could
> simply move 1/2 the distance across the dead band.
>
> Contact Dave or I off list if you're interested in a PIC solution. Dave
and
> I are currently working on a "stepper pulser" that runs a stepper with
> proper acceleration/deceleration in either direction when a switch or push
> button is actuated. Your project doesn't sound like a big leap from ours.
>
> A stepper driver would be required; an LMD18245 stepper driver would work,
> or you could order a single axis Xylotex board. The ELS board (ELS list)
> would be a candidate; it has a driver on board. Also has an LCD display,
> which may or may not be desired.
>
> Our stepper pulser board is smaller, and may be used with or without an
LCD.
>
>
> Alan KM6VV
>
>
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of turbulatordude
> > Sent: Sunday, January 29, 2006 8:25 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Re: Stepper driver question (slightly O.T.)
> >
> > --- 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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timg@...
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[Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
>
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>
>