Trouble Constraining

[Anonymous]

Hey guys, I am having trouble constraining the attached file. It is a simple trapezium type shape but I am having troubles constraining it to make it a solid which I can extrude. I have tried many different combinations of constraints and dimensions to no avail. Every time I use the auto constraint it always leaves me with 2 dimensions left over and if i try to constrain or dimension it further it tells me it is over constrained. Any help would be much appreciated. Thanks -Mike

[JDMather]

First thing I noticed is 4 Fix (lock) constraints.

You should (almost) never ever use Fix constraints.

You are missing 2 horizontal constraints and 5 coincidient constraints.  Inventor should have automatically added all 7 of these missing constraints.  What happened to them?  Did you delete them?  Did you fool with Constraint Options (if yes, don't).

I recommend you go through these.

http://home.pct.edu/~jmather/SkillsUSA%20University.pdf
http://inventortrenches.blogspot.com/p/inventor-tutorials.html
http://wikihelp.autodesk.com/enu?adskContextId=HELP_TUTORIALS&language=ENU&release=2014&product=Inve...

[JDMather]

My solution might look something like this - using symmetry about the origin.