Inventor General Discussion

Inventor General Discussion

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Valued Mentor
acwtzwegers
Posts: 435
Registered: ‎04-20-2011
Message 1 of 4 (319 Views)
Accepted Solution

So, what software to believe?

319 Views, 3 Replies
06-30-2011 02:57 AM

I need weight (volume/length or basically area times density) and statical values (Ix, Iy) of varied profiles for quotes. I started noting differences in different software - for the same profiles, from the same .dwg. So who do I believe?

 

Attached are the massprops of AutoCAD Mechanical, Inventor and Solidworks of a basically rectangular profile of 217 mm x 10 mm. (with r=0.5 mm fillets on the corners). In Inventor and Solidworks I basically extruded it 1000 mm.

 

Ok, area should be about 217x10=2170 mm^2 (minus the fillets, about 0.05 mm^2 each) and Ix=217x10^3/12=18083 and Iy=10x217^3/12=8515261 ... according to my minimal understanding of such things combined with my calculator.:smileywink:

 

Now, I just don't see much of these numbers in Inventor or Solidworks... am I looking wrong or calculating wrong or which one is actually accurate?

Inventor & SW are giving you the properties of the whole 1 m bar, not a cross-section.  For example, the area given is the entire surface area of the bar, not just one end.  And the moments given by Inventor & SW are mass moments, not area moments.

*Pro
sbixler
Posts: 1,930
Registered: ‎09-15-2003
Message 2 of 4 (251 Views)

Re: So, what software to believe?

06-30-2011 05:27 AM in reply to: acwtzwegers

Inventor & SW are giving you the properties of the whole 1 m bar, not a cross-section.  For example, the area given is the entire surface area of the bar, not just one end.  And the moments given by Inventor & SW are mass moments, not area moments.

Valued Mentor
acwtzwegers
Posts: 435
Registered: ‎04-20-2011
Message 3 of 4 (216 Views)

Re: So, what software to believe?

06-30-2011 06:29 AM in reply to: sbixler

Thank you, that makes sense.

 

Any way to let Inventor give me the area moments etc? It is what software our customers use needs to see if constructions are according to norm.

*Expert Elite*
jtylerbc
Posts: 886
Registered: ‎09-01-2010
Message 4 of 4 (183 Views)

Re: So, what software to believe?

06-30-2011 07:53 AM in reply to: acwtzwegers

While editing the sketch, use Region Properties on the Inspect tab, Measure panel.

John Tyler
Inventor 2015
Windows 7 64 Bit
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