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Anonymous
en respuesta a: Valentin-WSP

Solution: Change the number of decimals displayed in UNITS to 8, since CAD keeps 8 anyway. 

 

The problem came from using my UCS to rotate in 3D, because apparently my UCS was only correct to the 4 displayed decimal points but had errors in the subsequent 4 decimals. Therefore, after rotating my boxes the 4 corners of the mating face were not in the same plane as the face I wanted to mate to. So, when I used 3dalign to align the mating surfaces, they only touched at the 1 corner that I used to align them, but the other corners missed each other, barely. 

 

So, Valentin's solution of just using the WCS would have worked too, but if you want to use UCS, I would just display all 8 decimals so you can catch if the coordinate system is slightly off. But at the point you mentioned, it was the difference in X that caused the issue, which your measurement does not show, since you only display 4 decimals (the error will be in the 5-8 decimal), whereas the difference in Y you point to is actually the width of the box; so you probably measured different points all-together—maybe.