"Doug White" wrote in message
. ..
Joseph Gwinn wrote in news:joegwinn-
:

snip
I have Alibre, and use it occasionally for 3D stuff, but it's a bit
buggy. If you don't apply constraints just right when aligning parts, it
will disassemble things at weird angles. "Undo" works, so it's not
fatal, but annoying.


To avoid that problem while constraining parts in an assembly, anchor the
1st part (preferably a "central" part). To do that right click on the part
name in the Design Explorer and select "Anchor Part". You may want to
constrain that first part to the major planes or axes before anchoring, but
if you do, delete the constraints after anchoring to avoid over-constraint
errors..