How do I change the Eagle NC drill file precision?
By default Eagle generates the NC drill files with 2.3 file format (i.e. 3 digits after the decimal point) in some cases if your board is designed in Imperial units (while default Eagle database units are metric) and the board is high density there is small error due to the rounding when the drill XY coordinates are generated. This leads to small displacement of the holes inside the pad area i.e. your holes are not in the center of your pads. You can increase the NC drill precision by following procedure: Go in your EAGLE BIN folder and make copy of EAGLE.
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