Hello All, I am a newbie to cnc and I am glad to have access to such a resourceful site. I have a 24"X36" tabletop cnc machine and I am going through the initial testing. The problem is that when I run the circle g-code program it comes out as an oval instead. I am not sure where to start troubleshooting this problem. Your help is really appreciated. Thank you

Hi Wellbuiltcabs,

How oval, .001 or .250", how are the axis driven, ball screws, belt and pulley,

A little more detail would help us give you a realistic answer.

Graham.

Sounds like you may have your step per unit set wrong for one or both axis. But as Graham says more info is needed as it could be one of many things.
Hood

After hours of troubleshooting I found out that my table was off by 1/16" and pushing on the y axis mount. Its smooth now.
Its 24X36 tabletop running on 177 oz steppers and acme 10:1 screws. it has Y and A axis with A being the slave and Y the main axis.
I do have another problem now. it seems my X and Y axis motor outputs are reveresed only when I try to reference. when I reference X the Y axis moves instead and vice versa. I checked all the cabling and it all traces fine. when I jog it works correctly X is X and Y is Y. what could be the problem? I also tried uninstall and reinstall Mach3.

How are you referencing? ie are you using the Ref All button? if yes then the only thing I can think of is for some strange reason the code in the button  has been mixed up.

Hood

I am using ref y button in diagnostics. How do I check the code for the buttons?

Well dont think that button is a VB button so you will have to open your screen in Screen4 ( its in the MACH3 Folder) go to the Diags screen and double click on the Y button and make sure its set up for the Home Y .

Hood

Thanks Hood. I tried that and when pressing home x, y moves and I press home y, x moves. I think there is something going on with the set I am using in the reference buttons. Also when I press ref y button, the axis does not move but the dro numbers are moving. Please advise.

Please zip your screenset and xml file and post them and I will have a look see if I can find out whats happening.
Hood

Thank you, will do shortly.