A Fusion 360 user with a GRBL router (the guy is very precise) has a recurring problem with inside dimensions in his different parts. External dimensions are extremely close to desired dimensions (delta is less than 5/100 of a millimeter), but internal dimensions are systematically too small (+- 0.7 mm). I have to add that he tested with both possibles compensations, with always the same result.
Any idea where to look for ?
Thanks for your help.
Internal contours always a bit too short while external contours are right on ?
Tests have been made on parts of about 50 x 50 mm
Can you share the test file where you've machined a pocket and an external part? Are you using the same cut direction for both and the same finishing cut stepover?
Mark Hughes
Owner, Hughes Tooling
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