RE: [CAD_CAM_EDM_DRO] Loosing position and need help...

Would sound like you getting some growth. Heat causes aluminum to grow at a
rate of .0000063 inch per inch per degree F and steel will grow at about 1/3
of that amount. You could also get some variation in readings based on the
temperature in the electronics cabinet..causing resistors to change values
and such.
R. Wink

> -----Original Message-----
> From: mmurray701 [mailto:gmurray@...]
> Sent: Sunday, January 02, 2005 12:00 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Loosing position and need help...
>
>
>
>
> I have a Taig CNC mill powered by G320's, Electrocraft E543 servos
> with renco encoders setup in a 2:1 reduction. Running off a P133 in
> dos with TurboCNC V3 (not sure exactly what version but its the
> latest release of V3)
>
> I'm picking up a few thousandths on long machining files. If I run
> an hour long program i could be off by a few thousanths on X or Y,
> seems to vary depending on what file i'm running. I've written all
> sorts of test files and can never seem to duplicate the problem.
>
> I have no idea whats causing it, tried almost everything to fix it
> with no luck and its really starting to turn me off from CNC
> machining. I thought I knew enough about this to solve it but no
> luck. Have to turn to the experts on here for help.
>
> The fault lights are not comming on, I've tried a different
> computer, and shielded cables are used everywhere so picking up
> steps is unlikely. Anybody have any suggestions on something else to
> try? When I did switch computers, i did keep the same hard drive,
> should i format it and start fresh? Anything else?
>
>
>
>
>
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