Re: [CAD_CAM_EDM_DRO] Re: Need help with SuperCam step size settings

If you are not using backlash compensation then how can you accurately make
a pocket cut? The cutter is traversing back and forth across the pocketed
region, or is spiral pocketing where the cutter is on one side of the
backlash on the left side of the cut and the other side of the backlash on
the right side of the cut.

There are so many variables in every system that it is difficult to know
where all the potential problems exist. For example it is possible that
your cutter is not plumb in the X-direction. If it is slightly slanted then
it will cut a slightly wider pocket in the direction of the slant compared
to the other direction. Have you trammed the head of the mill to ensure the
axes are perpendicular?

Another thing that you can do, if you feel the error is truly reproducible,
is to just compensate for it in your programming. Diminish your X-axis
dimensions by 0.1% (or whatever you think it should be). Your CAM program
should be able to scale any single axis by any amount. This will allow you
to work until you figure out where the problem is. This is exactly
equivalent to your original idea of changing the step size.

If you need somebody to field test one of your cues, I would be happy to
demo one.

Daniel J. Statman, Statman Designs
www.statmandesigns.com
dan.statman@...

----- Original Message -----
From: "SMW51" <michaelwagner@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, September 29, 2002 8:00 PM
Subject: [CAD_CAM_EDM_DRO] Re: Need help with SuperCam step size settings


> I currently have no x or y-axis backlash settings. I've had the mill
> only a few days. Backlash was my next consideration once I could get
> the x and y travel to be equal.
>
> I have just started to sell custom cues to some local customers.
> I've spent the last 11 months, or so, building cues, testing them and
> then cutting them up. Except for the ones I use. Most of the others
> were pretty good, but not good enough. One was used by a player at
> the BCA junior nationals and a few others are now being used (tested)
> by local players. I don't have a web site yet. Before I try to
> market any cues beyond the local area I want a minimum of one year on
> some of the test cues and then some pretty intense usage (and abuse)
> of the ones that supply to local pool rooms as demos.
>
> I'm almost afraid to ask what else the problem could be, but please
> enlighten me.
>
> --- In CAD_CAM_EDM_DRO@y..., "Dan Statman" <dan.statman@r...> wrote:
> > Are you using backlash compensation in your controller software?
> If so,
> > having it set at 0.001" too high will cause this same problem.
> What is the
> > backlash in your system on the Y-axis and the X-axis. I really do
> not think
> > your problem is with the threads of the leadscrew, but I have no
> real basis
> > for that, just a feeling since there are so many other
> possibilities for
> > this problem.
> >
> > Do you make custom cues? Do you have a website, I would be very
> interested
> > in seeing your work.
> >
> > Daniel J. Statman, Statman Designs
> > www.statmandesigns.com
> > dan.statman@r...
>
>
>
>
>
> >
> >
> > > > >At first I cut circles out of plastic. I marked them with the
> x
> > > and y-axis. The diameter on the y sides was acceptable. The
> > > diameter on the x sides was off. I measured the pockets I had cut
> > > and found a similar discrepancy.
> > > Then I cut various sized horizontal and vertical lines
> through .200
> > > plastic with an endmill and measured them with dial calipers. The
> y-
> > > axis lines were pretty much on each time. The x-axis lines were
> > > consistently off by .001. I'm making inlays for pool cues.
> > >
>
>
>
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