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Aluminum?
You genreated G code with two tools, which was used to mill the part?
It looked like the cuts were not ramped in. Did the tool have the capablity to make a ramp cut (changing Z while X...

I'm interested in building a large (10'x20') CNC router. Have 3PH gear motors with brakes ever been employed successfully as the XYZ motive force for a CNC? I assume some type of position feedback...