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Booleans on parts with tangent surfaces
In the real world, I expect that if I lay one part on top of another so that their surfaces are tangent, then I can glue them or weld them together so that they are joined.
But this seems a difficult thing in Onshape. Much of the time, if surfaces or edges are tangent, then the Boolean fails. It seems silly to add 1/100th of an inch to artificially overlap the tangent surfaces just to get the Boolean to work.
Does anyone know why tangents are such a problem with Booleans? I avoid them where I can, but sometimes the parts to join just have to be tangent---like a panel to be welded on a beam or strut...