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

hi Marv

I have done my guitar pickup winding machine as the
way as you describe, the Square Wave Generator is only used
for preset the start place or the windind (the second synchro wave,for
windings
is generated with a photocell on the spindle, ex: spindle feedrate/carriage,
directly hooked with the step input pin)

-First you have to inject a square wave in the step
input pin of your stepper board , an adjustable lenght wave generator
throught a cmos 4066 based board can produce stable logic compatible
wave, it's possible to add throught 1,2 or 3 R/C adds some presetted
values plus a fine tuner.

-secondly , an EXOR logic CI can provide what you want ,the
output will be injected in the DIR stepper board input pin.

X X O =CW
X 0 X =CCW
0 0 X =CCW
0 X X = CCW

But this shematic work only if you use a notched template
with the lenght (or width)of the darkener for X X O etc...according with
the logic you need and the length of you displacement.

For my purpose , I use different templates (patterns ?) according
with the width of the coils

I use also some push button to stop the wave during the
carriage move .

for security , because sometime a photocell can fail (!..)
to add limit switches connected in the Enable/Disable input
stepper board can prevent from overload.

thierry

----- Original Message -----
From: "turbulatordude" <dave_mucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, January 30, 2006 5:24 AM
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
>
>
>
>
>
>
>
>
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
> Moderator: pentam@... indigo_red@... davemucha@...
[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
>
>
>
>
>
>
>