Inventor General Discussion

Inventor General Discussion

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Registered: ‎10-29-2012
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2 dimensions needed, cannot constrain a simple square

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10-29-2012 08:17 PM

I do not know what I am missing but when I sketch any basic shape i end up with "2 dimensions needed" in the lower right and it doesn't matter what I dimension or constrain I cannot get a part to Fully Constrained.  any assistance would be greatly appreciated.

 

constraints are needed to not just dimension the drawn objects but to also locate them in "space"

 

Assuming you've drawn a rectangle and dimensioned each side then you'll still need 2 constraints to lock it in a position on the sketch.  Options:

1) Dimension to any existing geometry

2) Dimension to the center-point

3) use a "fix" constraint to lock 1 of the corners of the rectangle

 

While option 3 seems the easiest 2 and 1 are better and 2 is generally the best a LOT of the time.  From the Options menu -> Sketch tab and make sure "autoproject part origin on sketch create" is ticked - now, whenever you create a sketch there will be a little dot at the origin to tie your sketch to.

 

If you still need constaints are dimensioning the rectangle AND dimensioning it to the origin then you probably need a horizontal or vertical constraint and check parrallel and perpendicular constraints are being set.  Basically you've created a random quadrilateral/trapezium instead of a rectangle with parallel edges.

 

Hope that all makes sense - if you're still struggling post a screen-shot of your sketch and we can try to show you what's missing.

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Registered: ‎10-21-2009
Post 2 of 4

Re: 2 dimensions needed, cannot constrain a simple square

10-29-2012 09:31 PM in reply to: crtcadmin

Auto_dim.jpg

 

Click on "Automatic Dimension" to see what's needed.

Franc
inventor :-)
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Post 3 of 4

Re: 2 dimensions needed, cannot constrain a simple square

10-30-2012 01:47 AM in reply to: crtcadmin

constraints are needed to not just dimension the drawn objects but to also locate them in "space"

 

Assuming you've drawn a rectangle and dimensioned each side then you'll still need 2 constraints to lock it in a position on the sketch.  Options:

1) Dimension to any existing geometry

2) Dimension to the center-point

3) use a "fix" constraint to lock 1 of the corners of the rectangle

 

While option 3 seems the easiest 2 and 1 are better and 2 is generally the best a LOT of the time.  From the Options menu -> Sketch tab and make sure "autoproject part origin on sketch create" is ticked - now, whenever you create a sketch there will be a little dot at the origin to tie your sketch to.

 

If you still need constaints are dimensioning the rectangle AND dimensioning it to the origin then you probably need a horizontal or vertical constraint and check parrallel and perpendicular constraints are being set.  Basically you've created a random quadrilateral/trapezium instead of a rectangle with parallel edges.

 

Hope that all makes sense - if you're still struggling post a screen-shot of your sketch and we can try to show you what's missing.

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Post 4 of 4

Re: 2 dimensions needed, cannot constrain a simple square

10-30-2012 05:39 AM in reply to: crtcadmin

Attach ipt file here that exhibits this behavior.

 

You might read this document

http://home.pct.edu/~jmather/SkillsUSA%20University.pdf

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