Center of Mass

[affie]

I am studying for the certified solidwors associate and wanted to know what is the best way to determine the origin of an assembly/part in the beginning to get the correct center of mass after the part drawing and assemble together or where I can go to find out.

Thanks
Affie

 

[MadMango]

Just click on the assembly Origin before you see the center of mass. The CofG is calculated from there.

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read faq731-376 to make the best use of Eng-Tips Forums?

 

[handleman]

The test questions tell you where the origin of your part should be if it matters for the question.

-handleman, CSWP (The new, easy test)

 

[affie]

Thanks you.

 

[affie]

Even with correcting the origin as shown on the problem, my problem is the center of mass is always wrong. But I get the overall mass and volume of the assembly correct when doing the practice questions. Any suggestion on getting the correct center of mass .

 

[fcsuper]

If the CoM is wrong, then I think you are making the part wrong. They expect you to pull that info directly from SW itself from the CoM it provides on that screen.

Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group

 

[affie]

When I double check the questions asked, the overall mass of the assembly and volume of the assembly are correct. It is the center of mass location I am getting wrong.

 

[handleman]

Then you are modeling your part with either the incorrect origin or the incorrect orientation. Check to make sure that all of the axes are pointing in the same direction as the example part.

-handleman, CSWP (The new, easy test)

 

[GregLocock]

Why not model up a cube and check the centre of mass etc vs a hand calculation?



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[fcsuper]

Greg,

Because that's hard. Well, really answer is because that's not what the test is asking for.



Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group