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Distinguished Contributor
rickduley
Posts: 129
Registered: ‎04-08-2014
Message 1 of 4 (247 Views)
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Overconstraint problem

247 Views, 3 Replies
04-17-2014 12:41 AM

I am starting work with Shih's book Learning Autodesk 2014 although I am working with AI 2015.

In the first exercise I am sketching this beastie

 

_Shih-OverConstraintProblem.gif

 

Text calls for an angle of 50.00 degrees opposite the one shown.  Trying to dimension this raise an overcontraint warning.  In fact, the only point that is not dimensioned in this sketch (where the inner slope on the right meets the upper horizontal line) cannot be dimensioned without that warning.  I am offered the alternative of a Driven Dimension.

 

What causes this problem and how do I fix it?

 

Thanks

In the future - it would have been more helpful if you had attached the *.ipt file here when you ran into trouble.

My guess is that the real problem is that Inventor automatically put a Perpendicular constraint between the angled lines.

(BTW - I would not constrain/dimension as shown in the book. I might find time to post example later today.)

 

Don't worry about the arrows or dimension location in sketch mode (try zooming in or out - what happens to your dimensions text/arrows).

In AutoCAD you are doing 2D detailing.  When you finish your model in Inventor you will leave the Inventor modeling (ipt) environment and enter the Inventor detailing (idw or dwg) drawing environment where you will detail your drawing to standards - just like AutoCAD (only better).

Distinguished Contributor
rickduley
Posts: 129
Registered: ‎04-08-2014
Message 2 of 4 (240 Views)

Re: Overconstraint problem

04-17-2014 01:05 AM in reply to: rickduley

Oh Dear!  :smileyfrustrated:  It's always this way.  The moment I give up and ask for help, I send off the post and then solve the problem.  Garn!  :smileyfrustrated:

 

The solution was to delete the horizontal line and the offending slope, then replace them.  No problem after that.

 

_Shih-OverConstraintProblem_2.gif

 

Still a question though if you folks don't mind.

 

Note the two .100 dimensions at the top.  How can I control the way the arrows fit?  Obviously, here the example on the left is preferable.  I know this would be an issue if AutoCAD, does it even matter in Inventor?

 

Thanks

*Expert Elite*
JDMather
Posts: 27,034
Registered: ‎04-20-2006
Message 3 of 4 (227 Views)

Re: Overconstraint problem

04-17-2014 03:52 AM in reply to: rickduley

In the future - it would have been more helpful if you had attached the *.ipt file here when you ran into trouble.

My guess is that the real problem is that Inventor automatically put a Perpendicular constraint between the angled lines.

(BTW - I would not constrain/dimension as shown in the book. I might find time to post example later today.)

 

Don't worry about the arrows or dimension location in sketch mode (try zooming in or out - what happens to your dimensions text/arrows).

In AutoCAD you are doing 2D detailing.  When you finish your model in Inventor you will leave the Inventor modeling (ipt) environment and enter the Inventor detailing (idw or dwg) drawing environment where you will detail your drawing to standards - just like AutoCAD (only better).

Please mark this response as "Accept as Solution" if it answers your question.
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Distinguished Contributor
rickduley
Posts: 129
Registered: ‎04-08-2014
Message 4 of 4 (195 Views)

Re: Overconstraint problem

04-17-2014 02:18 PM in reply to: JDMather
Thanks JD
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