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Excellon Drill Holes not lined up with Copper Layers


Chris56000

Hi!

I'm trying to make this experimental Z80 PCB on a CNC machine for my friend, but the Excellon *.drl file doesn't come aligned with the copper plots - the drill layer is about four times the size of the copper layers and way off the board!

I get the same result when I view the Gerbers in FlatCam and the open-source gerbv tool!

Can someone explain to me what's going wrong please?

Chris Williams