Re: Need help with SuperCam step size settings

--- In CAD_CAM_EDM_DRO@y..., "Dan Statman" <dan.statman@r...> wrote:

> How are you measuring the 1.001" of travel? There are many ways to

do this,

> and some of them are prone to causing errors. Also, is it a

consistent 0.1%

> error over the entire leadscrew? If so, then it is most likely not
> leadscrew inaccuracy. DO not take this last comment as offensive,

but if

> you need greater than 0.1% accuracy, you may need a better

machine. What

> types of parts are you making?
>
> Daniel J. Statman, Statman Designs
> www.statmandesigns.com
> dan.statman@r...
>
> ----- Original Message -----
> From: "SMW51" <michaelwagner@m...>
> To: <CAD_CAM_EDM_DRO@y...>
> Sent: Sunday, September 29, 2002 7:35 AM
> Subject: [CAD_CAM_EDM_DRO] Need help with SuperCam step size

settings

>
>
> > The x axis, actual travel, on my Taig mill is .001 per inch longer
> > than it should be. I assume the problem is related to a less than
> > perfect 20 tpi leadscrew. I calculate that I need to use 7992

half

> > steps instead of 8000 to compensate for the error. If my math is
> > correct that will translate to .000125125 instead of .000125

travel

> > per half step. So far as I can tell the SuperCam 'set step'

commands

> > allow for a 6 digit field. Entering .000124 or .000126 would

clearly

> > make the problem worse. I haven't been able to find a way to

change

> > the number of half steps to 7992. Is there a way to make this
> > change? If not is there any other way to compensate for the

error?

> >
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> >
> > 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

as 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.
> >
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> >
> >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.