Hi,

what units do you use?

Mark the current location of the torch. Zero X, move X some reasonable distance, say 200mm or 8in in the X axis only

G0 X8.

Now move it back

G0 X0.

If it does not return to the same position the fix that, no useful work can be done otherwise. Once you are happy that X is moving

the nominated distance do the same thing with the Y axis.

If you wish to cut an 8 inch circle then the X axis must be able to travel 8 inch, not 7.5 or 8.5 but 8. Likewise Y must be able to move

8 inch on command otherwise the circle will not be round.

Fix each axis independently to be accurate first then cutting circles is a doddle.

Craig