Re: [CAD_CAM_EDM_DRO] Re: New Article Posted

---------
So anyone using these boards will need to turn OFF microstepping, OR the
auto current and noise reduction. Can't use both without losing steps...
--------
That is correct, assuming you consider half-stepping not microstepping. Step
divisions greater than 2 (the default) are not recommended for the 7062 in
sync mode. For most applications using the PC parallel port, the required
pulse rate would be too high anyway if you used higher microstepping rates.
I don't see where there is all that much to be gained anyway by high
microstep rates in this case. The extra efficiency is trivial. We probably
will eliminate the step rate selection jumpers in the next revision.
--
Phil Mattison
http://www.ohmikron.com/

----- Original Message -----
From: ballendo <ballendo@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, May 07, 2006 6:15 PM
Subject: [CAD_CAM_EDM_DRO] Re: New Article Posted


> Phil,
>
> Thank you for the reply.
>
> Snips, inserts below...
>
> >In CCED, "Phil Mattison" <mattison20@...> wrote:
> >
> >It doesn't actually "require" the PPT0106, although it will be
> >quite a bit easier if you use it.
>
> Yes, that's what I wrote. Folks looking at the price of the drivers
> should keep this on mind... (I think you have GREAT prices; just
> don't want apples confused with oranges.)
>
> >but realized it would be cheaper to consolidate certain functions
> >into the breakout board. I kept them separate for better physical
> >design flexibility when building a box.
>
> Yes, as I said I applaud your "lines of division"...
>
> >The drivers are based on the SLA7062M, which by the way does not
> >have a full-step mode,
>
> Yes, corrected my error in the follow-up post.
>
> >but does not lose any steps when in sync mode. I've been using this
> >setup in half-step mode for months and have not had any problems.
>
> Yes, in HALF STEP mode it will work fine. BUT you WILL lose steps if
> you try to microstep whilst using the sync mode. (or going into and
> out of it).
>
> So anyone using these boards will need to turn OFF microstepping, OR
> the auto current and noise reduction. Can't use both without losing
> steps...
>
> Unless you've done something special with your PIC, as I wondered
> earlier???
>
> Thank you in advance,
>
> Ballendo
>
> > ----- Original Message -----
> > From: ballendo <ballendo@...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Saturday, May 06, 2006 8:08 PM
> > Subject: [CAD_CAM_EDM_DRO] Re: New Article Posted
> >
> >
> > > Hello,
> > >
> > > I too, appreciate your drives and the design "philosophy" of
> > > minimising the drive board components and stuffing the "breakout"
> > > portion.
> > >
> > > Your "division of labor" makes the driver boards less expensive,
> > > but "requires" the use of your pport board. (Folks should realise
> > > that using the drivers without your pport portion will be <much>
> > > harder than using other integrated drives.)
> > >
> > > Quick question: Does your pic only allow going into Synchronous
> mode
> > > on full steps? (Because otherwise you'll lose steps going into
> and
> > > out of sync mode with Allegro chips.) Since we cannot know in
> > > advance when a "final" step is coming, I'll be interested
> inhearing
> > > how youdoeal with this?
> > > (I'm guessing you're using Allegro chips from the pinouts and
> > > pictures which show traces and rivets in "familiar"<G> places.)
> > >
> > > Thank you in advance,
> > >
> > > Nice products!
> > >
> > > Ballendo
> > > > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Phil Mattison"
> > > > > <mattison20@> wrote:
> > > > > >
> > > > > > For anyone who might be interested, I've posted an updated
> > > article
> > > > > on my web
> > > > > > site about how to Build Your Own 3-Axis CNC Stepper Control
> > > > > System. This<snip>
>
>
>
>
>
>
>
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