Inventor General Discussion

Reply
Valued Contributor
schnautza
Posts: 139
Registered: ‎03-13-2013
Message 1 of 8 (268 Views)
Accepted Solution

Folded piece of fabric

268 Views, 7 Replies
02-06-2014 08:42 AM
I'm trying to figure out if it is possible to model a folded piece of fabric that can be unfolded. Starting with the unfolded position, we have a piece of material that will be approx 7'-6" wd x 6'-4" lg. First, the 7'-6" section will be folded into 3 pieces (2'-6"). Then the result will be folded in half in the other direction, giving us a 3'-2" x 2'-6" 6-layer folded fabric. I assume that something like this can be done with lofted lines to make surfaces and then applying a thickness. I have gotten as far as the first set of folds with adequate results by lofting lines on parallel planes, but I am at a loss as to how I can now do the final fold...because these three layers all need to double back over each other. Any ideas? Also, once folded, is it possible to unfold easily? Or do I just build a fresh new model for this view?
*Expert Elite*
cwhetten
Posts: 1,051
Registered: ‎09-03-2008
Message 2 of 8 (257 Views)

Re: Folded piece of fabric

02-06-2014 09:07 AM in reply to: schnautza

Modeling double folds in Inventor sheet metal is not easy, especially if you want to get a meaningful flat pattern.

 

I experimented with this idea by modeling a sticky note that has been folded in half one way, then in half again the other way.  The first fold is trivial, but the second is not.  The particularly difficult part is the corner where both folds come together:

 

Double Fold Corner.PNG

 

After several failed attempts, I was able to get it to work by creating the radii of the second fold using the contour roll tool (see attached part, version 2012).

 

Use the contour roll tool with caution, as it often returns meaningless flat patterns.  In this very simple case, it appears to have worked properly, but I can't say if it will for your project.

 

Cameron Whetten
Inventor 2014

*Expert Elite*
JDMather
Posts: 26,287
Registered: ‎04-20-2006
Message 3 of 8 (252 Views)

Re: Folded piece of fabric

02-06-2014 09:11 AM in reply to: schnautza

schnautza wrote:
.... I have gotten as far as ....
...

Attach the *.ipt file of what you have completed so far.
If I follow your problem description correctly - someone posted an example here several years ago that worked.

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2014 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Valued Contributor
schnautza
Posts: 139
Registered: ‎03-13-2013
Message 4 of 8 (226 Views)

Re: Folded piece of fabric

02-06-2014 11:11 AM in reply to: schnautza
Dang it, I would attach the file, but this forum is acting up again and I once again cannot attach a file or format text. Soon as it works again, I'll post it. I did find a feature that is helping me - "bend part". I made the full length part and was able to successfully fold the entire thing in half.
Valued Contributor
schnautza
Posts: 139
Registered: ‎03-13-2013
Message 5 of 8 (225 Views)

Re: Folded piece of fabric

02-06-2014 11:17 AM in reply to: schnautza
I started a new part with the "bend" feature in mind (Modify-->Bend). Start with a full sized sheet, then just add bends as needed. You can double and triple bend as many layers as you want. Turned out to be super easy. Still can't attach the example, but there is the answer. To unfold it, all I have to do is suppress or remove the bend.
Distinguished Mentor
rdyson
Posts: 880
Registered: ‎04-11-2005
Message 6 of 8 (206 Views)

Re: Folded piece of fabric

02-06-2014 12:19 PM in reply to: schnautza
Be aware that bend does not calculate the bend allowance like the sheet metal features do.
Given you're dealing with fabric, it's probably not important, just wanted to point it out.
Also, I would derive the flat piece into a new part to add the bends. That was you can document both the flat and the folded part.
Valued Contributor
schnautza
Posts: 139
Registered: ‎03-13-2013
Message 7 of 8 (204 Views)

Re: Folded piece of fabric

02-06-2014 12:22 PM in reply to: rdyson
What do you mean by "bend allowance"? Something to do with the stretch of the material? And also what do you mean by "derive the flat piece"...just save it as another file? I plan on doing that.
Distinguished Mentor
rdyson
Posts: 880
Registered: ‎04-11-2005
Message 8 of 8 (198 Views)

Re: Folded piece of fabric

02-06-2014 12:31 PM in reply to: schnautza
Yes to bend allowance.
Start a new standard.ipt, cancel out of sketch if necessary.
Go to manage>insert>derive and choose your flat part. Apply your bends.
The bent part is now linked to the flat, changes to the flat will update the bent part.

You are not logged in.

Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register

Announcements
Are you familiar with the Autodesk Expert Elites? The Expert Elite program is made up of customers that help other customers by sharing knowledge and exemplifying an engaging style of collaboration. To learn more, please visit our Expert Elite website.

Need installation help?

Start with some of our most frequented solutions to get help installing your software.

Ask the Community


Inventor Exchange Apps

Created by the community for the community, Autodesk Exchange Apps for Autodesk Inventor helps you achieve greater speed, accuracy, and automation from concept to manufacturing.

Connect with Inventor

Twitter

Facebook

Blogs

Pinterest

Youtube