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Author Topic: tru circle  (Read 1615 times)

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Offline PCH

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tru circle
« on: March 09, 2012, 01:42:58 PM »
I have calibrated my axis for x & y axis to accuracy.  I am not getting a true circle.  Checked all components for play.
 On a 6" dia. it is out about.060  for one dia. to 90 deg. on the other.
 I cannot believe it is my cad/cam end.  What can I do to get a true circle. :(

Offline RICH

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Re: tru circle
« Reply #1 on: March 09, 2012, 04:26:14 PM »
You cutting an oval instead of a circle. That is indicative of poor axis calibration, backlash, or a varying lead of the screw.
RICH

Offline PCH

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Re: tru circle
« Reply #2 on: March 09, 2012, 05:59:59 PM »
As it turns out my gantry was not square with my x axis.
It was out about 3/16" over 24".   After truing it up
voila!  Perfect circle.   My calibration was spot on as I
use an indicator over 1" of travel on both axis.
Thanks for your response.
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