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I am simply trying to join two box's of identical cross-sectional profiles (I copy pasted the first box to make the second box). I rotated 1 box by 90 degrees relative to the other box, and then I 3Daligned (with 3D Object snap on corners) to make the boxes make an L shape (they have small cross sectional area compared to a long length). When I then union the 2 objects, I get two extra lines across the intersection of the L. This seems to indicate that they are mismatched along the dimension perpendicular to the "extra lines." That should be impossible, since the objects have identical length along this dimension (the second was a copy of the first and the properties do read the same length along this dimension). They should have an identical position along this dimension (indeed the properties list the same position). The 3Dalign using the snapping function should make the alignment precise(? maybe that is not true).
Anyway, I tried other methods as well: after 3Daligning, I tried extending the box in all 4 relavent directions with the snap to command to grab the corners of the box I am trying to union to, which I thought would close any mismatches; however, it does not. I.e. I still have the same issue when I union the objects.
I know that the 3Dobject snap grabs wrong points all of the time, but I have tried everything dozens of times, rotating and checking that I did not accidentally grab the wrong points.
So, Is the 3D object snap not precise enough? Is the 3dalign not precise enough? Do copies of objects have different dimensions at the sub-10ths scale? Is it because I made the blocks in a coordinate system rotated 45 degrees from my WCS, leading to trivially small but relevant rounding errors or something like that? Do I need to have some special setting of CAD turned on? What is the deal here?
Also, for what it is worth, I have been able to make other similar joints union perfectly; however, it only works on about 50% of the attempted joints (not 50% of the times that I try, but 50% of the joints--as in I try many many times before giving up). I am using the same techniques when it works and when it does not work. So, what do I do? Is this just the struggle of CAD or is there some trick I can use that I am not?
¡Resuelto! Ir a solución.