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Sketch Collapse (lines becoming zero length)

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Message 1 of 4
mrattray
218 Views, 3 Replies

Sketch Collapse (lines becoming zero length)

I opened a part today and noticed that it had collapsed into itself.

 

This should be a rectangle 85x15.75:

Capture.JPG

 

On closer inspection it appears that the vertical lines somehow became zero length lines. Why does this happen?

 

Edit: I should mention that I was able to repair the skecth by making the 85" dimension driven, then dragging the line over...

Mike (not Matt) Rattray

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Message 2 of 4
JDMather
in reply to: mrattray

I was able to repair the sketch by deleting the Vertical constraint (and then putting it back in again).

Very interesting.

 

But this brings up a question - why are you not using centerpoint rectangles?

And for many years I have recommended against horizontal and vertical midpoint constraints to constrain rectangles.


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Message 3 of 4
mrattray
in reply to: JDMather


@Anonymous wrote:

But this brings up a question - why are you using centerpoint rectangles?


I assume you mean "...why are you not using centerpoint rectangles?"

I originally drew this part before the feature was integrated into Inventor. If I was to draw it today, I would.


And for many years I have recommended against horizontal and vertical midpoint constraints to constrain rectangles.

Is this why?

Mike (not Matt) Rattray

Message 4 of 4
JDMather
in reply to: mrattray


@mrattray wrote:

Is this why?


No,  my reason was un-predictable results with sketch fillets or chamfers http://home.pct.edu/~jmather/AU2006/MA13-3%20Mather.pdf , but now you have given me an example of another reason.
Back then centerpoint rectangle tool didn't even exist.


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Autodesk Inventor 2019 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional


The CADWhisperer YouTube Channel


EESignature

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