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shastu
Posts: 1,802
Registered: ‎12-10-2003
Message 1 of 8 (257 Views)
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Holes show as oblong in flat pattern.

257 Views, 7 Replies
01-24-2014 06:15 AM

Please see attached file.  Is there anyway to get my hole to show up as a round hole in the flat pattern?

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JavaLodge
Posts: 100
Registered: ‎11-12-2013
Message 2 of 8 (251 Views)

Re: Holes show as oblong in flat pattern.

01-24-2014 06:22 AM in reply to: shastu

I'm not entirely sure why the hole is showing up as oblong.  My suspicion is that it's because the hole is on a curved surface (that is, the face that it is on has a curve, though it is an in-plane curve).  Whatever the reason, you could try adding the hole after the flat pattern is generated.  This hole will not show up when you go back to the folded part, but as long as you know its position relative to the edges you should be able to place it acurately.

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-niels-
Posts: 1,485
Registered: ‎06-20-2006
Message 3 of 8 (241 Views)

Re: Holes show as oblong in flat pattern.

01-24-2014 06:38 AM in reply to: shastu

Yes, see attached... though i doubt you'll like it that way either...

The roll is adding extra deformation, which might not be what it's doing in reality. (at least not as severe...)


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JDMather
Posts: 26,282
Registered: ‎04-20-2006
Message 4 of 8 (237 Views)

Re: Holes show as oblong in flat pattern.

01-24-2014 06:39 AM in reply to: shastu

Check the Flat Pattern in this file.

 

If the hole is made before rolling the part - the hole cannot be round in both the flat pattern and the rolled part as the material will be stretched.

 

If the hole is drilled after rolling - then it should not appear in the flat pattern.

 

Whether Inventor does the correct stretching of the hole is another question (I didn't try to evaluate), but logic indicates that the material stretches (or compresses) and therefore cannot be round in both states.

 

Edit:  I see neils beat me to the example.

Please mark this response as "Accept as Solution" if it answers your question.
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Distinguished Contributor
shastu
Posts: 1,802
Registered: ‎12-10-2003
Message 5 of 8 (231 Views)

Re: Holes show as oblong in flat pattern.

01-24-2014 06:43 AM in reply to: -niels-

No, that is not what I want either.  I wanted an actual hole both in the folder model, and the flat pattern, but when that didn't work I tried a cut just to see if that would give different results but it didn't.

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JDMather
Posts: 26,282
Registered: ‎04-20-2006
Message 6 of 8 (227 Views)

Re: Holes show as oblong in flat pattern.

01-24-2014 06:47 AM in reply to: shastu

Check this "solution".

Please mark this response as "Accept as Solution" if it answers your question.
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Distinguished Contributor
shastu
Posts: 1,802
Registered: ‎12-10-2003
Message 7 of 8 (214 Views)

Re: Holes show as oblong in flat pattern.

01-24-2014 06:57 AM in reply to: JDMather

Thanks so much for the quick response.  I knew there had to be a way to do it.

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-niels-
Posts: 1,485
Registered: ‎06-20-2006
Message 8 of 8 (213 Views)

Re: Holes show as oblong in flat pattern.

01-24-2014 06:58 AM in reply to: shastu
I figured as much, JD was a bit more thorough in explaining why it's happening.
See his other examples, maybe that works for you.
What i would do, if this would have to be made on our lasercutter, is model the folded so it works for assemblies and edit the flat pattern, filling the oblong hole and just recreate a round hole on the correct spot as a "flat-pattern only" feature.
Also not the greatest solution, but production could continue.

Using IV2014 Pro SP2 - upd.1, Win7-64bit

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