Inventor General Discussion

Inventor General Discussion

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Valued Mentor
MaximUdod
Posts: 535
Registered: ‎01-14-2010
Message 1 of 7 (250 Views)

True value of threaded part surface area automaticaly?

250 Views, 6 Replies
04-26-2013 12:51 AM

In most cases threaded parts are designed without true surface (just cilynder with texture) thus part surface area is calculated wrong (less than it is i real world)).

I wonder if there any automatic way to get true value of threaded surface which is modeled in traditional (simplified) way?

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johnsonshiue
Posts: 2,092
Registered: ‎04-30-2008
Message 2 of 7 (233 Views)

Re: True value of threaded part surface area automaticaly?

04-26-2013 08:51 AM in reply to: MaximUdod

Hi! Unfortunately, you need to create the geometry in order to get the surface area. You can either use Coil or Sweep command to do that.

Thanks!

 



Johnson Shiue (johnson.shiue@autodesk.com)
Principal SQA Engineer, Inventor
Mechanical Design
Autodesk, Inc.

Distinguished Contributor
VdVeek
Posts: 107
Registered: ‎09-13-2012
Message 3 of 7 (197 Views)

Re: True value of threaded part surface area automaticaly?

04-30-2013 02:33 PM in reply to: MaximUdod

Uma, What do you mean by True value of surface area? Do you want to know the extra mass the thread is adding to your model? or something else?

 

When i first read your post i thought of the extra mass that is missing because the thread is simplified. For an internal thread, Inventor is using the minimal minor diameter. If you use the minimal pitch diameter the average mass for the thread hole will be much better. I wrote an iLogic Rule that creates an user parameter with the corrected mass. The rule is for a simple thru threaded hole in a part with a thichkness d0 of 10mm.

You didn't tell which version you are using of Inventor, but i created this in 2012 hope you can have a look at the attached part.

Rob.

Autodesk Inventor 2012 Certified Associate & Autodesk Inventor 2012 Certified Professional.
Valued Mentor
MaximUdod
Posts: 535
Registered: ‎01-14-2010
Message 4 of 7 (187 Views)

Re: True value of threaded part surface area automaticaly?

04-30-2013 11:29 PM in reply to: VdVeek
I was asking about surface area but you are right mass of part with
simplified thread modeled is also calculated wrong.



Imagine the gold plated part with thread.

Somebody should calculate the surface as close to real as possible.

Of course modeling thread without simplifications would be the
workaround but this means extensive load on hardware while working with
assy with part as component....



PS: I'm using Inv12 and pretty sure there were no improvements made in
latter releases.
*Expert Elite*
mrattray
Posts: 2,481
Registered: ‎09-13-2011
Message 5 of 7 (176 Views)

Re: True value of threaded part surface area automaticaly?

05-01-2013 06:37 AM in reply to: MaximUdod
You could create the part as an iPart. You would have two iPart members; one with modeled threads and one with simplified threads. This way you can get accurate physical properties of the model, but still use a simplified representation in your assemblies and drawings.
Also, you should look on the app exchange site for the free thread modeler add-in. This will automate the construction of the thread features for you.
Mike (not Matt) Rattray

*Expert Elite*
JDMather
Posts: 26,543
Registered: ‎04-20-2006
Message 6 of 7 (171 Views)

Re: True value of threaded part surface area automaticaly?

05-01-2013 07:04 AM in reply to: mrattray

mrattray wrote:
...Also, you should look on the app exchange site for the free thread modeler add-in. This will automate the construction of the thread features for you.

Has this app been fixed? Last time I checked I thought it only did British Whitworth threadforms.

Please mark this response as "Accept as Solution" if it answers your question.
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*Expert Elite*
mrattray
Posts: 2,481
Registered: ‎09-13-2011
Message 7 of 7 (166 Views)

Re: True value of threaded part surface area automaticaly?

05-01-2013 07:29 AM in reply to: JDMather
I thought I had used it in the past for ANSI threads (I certainly didn't use it for Whitworth!), but I can't seem to get it to work for me now.
Mike (not Matt) Rattray

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