Re: DRO issue "HEDs in hand"

Thanks for the info, I think I'm going to give it a try. I feel that
the resolution should be adaquate for the majority of the work that I
do.

Dan, how did you mount the strip? I was thinking about a fiberglass
plane to support the strip. Hopefully this would lessen the effects
of temperature on the system, but perhaps this isn't needed.

I remember a website with pics of a linear encoder installation but I
guess I didn't bookmark it. Does anyone have a URL showing this
setup?

Thanks again, Roger Linscheid

--- In CAD_CAM_EDM_DRO@y..., "Dan Mauch" <dmauch@s...> wrote:
> I have used the linear 360 line encoder strips from USdigital with
good
> results. I guess you have to ask your self this question. Can my
machine
> really machine to .00069"? The reason I say this is many machines
like
> mill drills and other imported machines suffer from a variety or
> problems mainly caused by a lack or rigidity of the column and or
> excessive play in the spindle assembly. If you machine is rigid
then the
> USditial encoders used with the Kulaga/Mauch dro board should be
> adequate. It should be equal or better than a rotary encoder driven
by a
> rack or cable.
> I have been following Usdigital's 500 line encoder development for
the
> past three years. I have given up on them solving their problems
with
> it. But that sure would have been nice.
> Dan
>
> -----Original Message-----
> From: Ken Jenkins [mailto:kjenkins@b...]
> Sent: Tuesday, October 29, 2002 11:59 AM
> To: CAD_CAM_EDM_DRO@y...
> Subject: [CAD_CAM_EDM_DRO] Re: DRO issue "HEDs in hand"
>
> I posted a message a few days ago regarding the U.S. Digial Linear
> strip options ... 360 is the highest and in my opinion not
> high enough (360 x 4 = 1440 then 1 / 1440 = .00069 per increment.
> I want something closer to .0005 which would need 500 lpi. U.S.
> Digital in a recent email response did not sound very hopeful
> re: a linear strip with 500 lpi res. So that leaves a rotary
> encoder and wire arrangement. One would think you would want the
> highest res possible ... 2048?
>
> I have done several postings here in the past and recently ...
> other than Bubba (who has been very helpful) no one seems to
> have much information regarding what encoder works well with
> the Camtronics board. Has anyone used the 360 US Digital strips
> with the Camtronics board and got it to work and been satisfied
> with the result? OR Has anyone used a rotary encoder with wire
> loop arrangement with the Camtronics board and got it to work
> and been satisfied with the results? Could you share your experience
> here.
>
> Also, you should be aware that just having a couple HEDS does not
> help you unless they are matched to the particular encoder
> you select. The HEDS unit and the encoders are selected together
> and will not work if used with out matching them. There are linear
> HEDS and rotary HEDS and within those two groups there are specific
> ones for each resolution.
>
> Ken
>
>
> > Message: 4
> > Date: Tue, 29 Oct 2002 01:26:52 -0000
> > From: "Roger Linscheid" <r.linscheid@a...>
> > Subject: DRO encoders- Rotary or Linear?
> >
> > Hi, I am ready to begin adding a DRO to my G4003 lathe. What is
the
> > current thought on the best method to accomplish my goal?
> >
> > IIRC, when I was looking into this before, the linear strips from
> > U.S. Digital were only available in 250 CPI and this was not
> > considered high enough to provide the necessary resolution. Using
> > rotary encoders meant the possibility of losing counts if the
drive
> > cable slipped or stretched.
> >
> > Now U.S. Digital has linear strips in 300 and 360 CPI. Will these
> > provide a resolution of 0.0005 or better?
> >
> > I have a completed DRO board from Camtronics and several HEDS on
> > hand, so I just need to scrounge an old PC and start the
installation.
> >
> > Thanks for any input!
>
>
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