I'm trying my cnc, when performed square and rectangular shapes with certain dimensions indicated in the code satisfactorily; but when making circles, this form has truncated ends, to verify if the transmission has the error I change the x and y axes, and found that no transmission problem. How I can solve this problem. See attachment thanks.

Does the circle LOOK correct in the toolpath ?  IF it does then you may have a backlash problem with your machine.

 (;-) TP

I've been trying to backlash, but that value is entered or as this parameter is configured.
thanks