Re: [CAD_CAM_EDM_DRO] Re: Feedback/DRO DIY

If you are trying to cure lost step problems with an encoder feedback loop,
I would advise against it. You should fix the problem first as it is
probably caused by EMC putting out ragged step pusles. If you are using
steppermod try freqmod, although even that pulse train is not the best, it's
better than steppermod. Problem with encoder feedback with steppers is,
missed pulses are probably caused by uneven pulses or too high of an
acceleration (could be caused by uneven pulses) when EMC senses a missed
step it will try to spit out pulses even faster to compensate, causing even
more missed steps, causing EMC to spit out pulses even faster etc, etc.

If you are using Geckos, try adding the pulse multiplier board as it will
then generate it's own pulse train which should be cleaner than EMC's. Or
you can try another program which may have a better pulse train than EMC.

Just my 2 cents

Bill

----- Original Message -----
From: <abbylynx@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, February 19, 2003 2:29 PM
Subject: [CAD_CAM_EDM_DRO] Re: Feedback/DRO DIY


> > There is Kulaga/Mauch card.
> > I believe its in a public domain now.
> > Alex
>
>
> Yes, I've seen that one around as well - they seem to be the same
> design with perhaps minor revisions.
> Does anyone know if this works with EMC or not?
>
>
> I really need to get some kind of feedback mechanism in place.
> Thanks
>
>
>
>
> > > building your own ISA DRO card for under "fiddy dowwah". <a
> > > href="http://www.boondog.com/%5Ctutorials%5C7266%
> > > 5C7266.htm#Initialization">HERE</a>
> > >
> > > It's only 2 axis, but you could just make another one and put it
> on a
> > > separate IO address to give you 4 axis. Could something like this
> be
> > > made to work with EMC and a step/dir driver? Or would that require
> > > some major hacking and recompiling?
> > >
> > > As I've had and keep seeming to have all kinds of problems with
> lost
> > > steps, I've become very distrusting of my mill setup, so something
> > > like this seems the way to go. Does anyone know of any prebuilt
> > > DRO/feedback systems that are somewhat low cost? (The cheapest
> I've
> > > seen a DRO card for was about $200 - definatelt not worth the
> price).
> > >
> > >
> > >
> > > Addresses:
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> 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
>
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timg@...
> Moderator: pentam@... indigo_red@... [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
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>