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y is off .120

y is off .120

Postby maineshops » Mon Jun 15, 2015 12:55 pm

I cut an oval using cut2d and it came out .120 wide in the Y and length was good. oval is 9.5 x 6.5. it cut 9.5 x 6.620.
I set the xyz with a dial indicator a month ago. any ideas where to start looking for the problem? thanks Dan
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Re: y is off .120

Postby ShenValleyCNC » Mon Jun 15, 2015 8:56 pm

One of things I do in a situation like this is go back to the code generation and turn the drawing 90 degrees and regenerate the GCode.

Your oval should then draw something like 6.5 x 9.620. You can also cut air and watch the numbers. If the numbers are ok, then cut in wood. If it messes up, its free play in the driveline. Do the same cut again in the opposite direction. If you get a different measurement result on that same axis, then there is almost certainly free play somewhere. If the numbers stay the same, then it is calibration or software error, maybe a hidden offset.

And if you get 6.620 x 9.5, the problem moves with the orientation, so it would be a software generation problem.
It always takes longer than you expect, even when you take into account Hofstadter's Law
Hofstadter's Law
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Re: y is off .120

Postby maineshops » Tue Jun 16, 2015 11:44 am

thanks Shen...good thought I,ll try your thoughts as soon as I can and see what goes on. Dan
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Re: y is off .120

Postby kevinl » Tue Jun 16, 2015 5:49 pm

wonder if a circle will turn into an oval.. which it should if the drivetrain is loose..
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Re: y is off .120

Postby maineshops » Tue Jun 16, 2015 9:05 pm

I was thinking that too Kevin but wouldn't that dimension be smaller rather than larger?
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