I have made a homemade CNC for double sided pcb protoyping. I use flatcam to convert excellon files in gcode and then use UGS to send this gcode to arduino. I tried to drill a pcb size 180x140 mm having four registration holes in the corner, but when i match the drilled PCB with the printout of excellon files they don't match.
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the red outline shows the drill being matched
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drills in flatcam
I tried to calibrate the CNC axis but the result is same.
I also tried to check whether the print is proper or not, so tried to print in landscape orientation as a result most of the drills match but some do not.
What possibly be the solution of this error?