Re: Feedback/DRO DIY

Abbylynx,

Mach1 has dro feedback which can be used independant of the control.
may be less money than yourother options. May also fix your lost
steps... Uses the nist interpreter that EMC uses, so your files will
be mostly compatible.

But let's look at your "some kind of feedback" statement...

Do you really need complete report on position at all times, or can
you do with a once-in-awhile, or "periodic" check?

Cuz if you can, you can get by with a few microswitches, or even a
single microswitch.

Just set it/them to "go on"(wire a bright led in series with power
and NC switch(es) at some particular part of your axis travel(s). And
be sure that "that" particular part of the travel has meaning for
your parts.

In other words, having a reassuring led "blink" at certain points in
your toolpath will let you know whether you're missing steps or not.


Cheap insurance until you fix the real problem, which is your
unreliable machine/control! Having said that, these type indicators
can be reassuring even on a "proven" setup. Most of the older control
had lights that lit when an axis was "home". We're just extending
that idea for positions other than home. And independant of the
control.

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "abbylynx <abbylynx@y...>"
<abbylynx@y...> wrote:

> > 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).
>