Constraints in Assemblies
Message 1 of 6
If I try to add two constraints between the bolt and the plate (one coincident to the underside of the bolt and the top face of the plate and one concentric with the inside of the hold and the bolt), then I get an overconstrained system since the plate is a part, so I cannot select individual surfaces. I tried geometric constraints for this, but eventually ran into similar problems once I constrained the geometric references to the original part to allow for dragging the complete assembly.
Is there a better way to constraint a bolt to a plate in an assembly?
I'm new to 3D cad, so any suggestions on additional books/reading that I should do would be greatly appreciated.
Message 2 of 6
If you look closely at your parts you somehow have one of them out of square. This would cause the error your getting.
By the way this technique you attempted is the only possible way to constrain a bolt to a plate. Bolt axis to hole axis or bolt od to hole id and a coincident to position the head is all you can do. Of course the bolt will still be free to rotate about it's axis but for now we won't worry about that.
I would suggest that you start over with new parts.
Message 3 of 6
Message 4 of 6
In reproducing a simple case for the 2nd time to share this, "Face/Datum" is showing in the context selection list when I click on Assembly -> Align and things are working -- before, this wasn't showing up -- I'll keep an eye on it to see why -- the only thing I did differently this time is I went through assemblies example (http://www.zwsoft.com/Service_Support/ser_zw3d/Show/en/200.html) before doing the latest test.
Now, for my more complex case, the same technique fails, so it must be a 90 degree issue as you mentioned, even though the parts *should* be at 90 degrees. I'll keep digging into it and report back with steps if I can reproduce the issue again.
Message 5 of 6
Message 6 of 6
In my more complex design, I removed all of the constraints and started over and everything is fine now -- I think I had picked some wrong edges (instead of faces) since I didn't have the pick-pull down set to "All".
So, looks like beginner misfortune. Thank you very much for the posts to confirm that it *should* work which gave me enough energy to push forward some more.
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