Inventor General Discussion

Inventor General Discussion

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jonselzer
Posts: 34
Registered: ‎01-13-2011
Message 1 of 8 (933 Views)

Center of Gravity of Surface models or Mesh Features

933 Views, 7 Replies
04-29-2013 11:16 AM

Ok received parts from a customer.  It was ALL mesh features.

I converted some of them(the mesh features) to Solids.  Some would not convert to solids (converted to surfaces).

I need to have the COG show up correctly.  Yes, I have a physical COG.  I know where it is supposed to be.

I am trying to use this and several other parts (with mixed, Solids, Surfaces, Mesh features), in an assembly AND balance it all thru a common lift point.

How can I correct the COG of the individual parts, so that the assembly is correct.

I have work planes for the corrected COGs, but I am afraid that I will need to calculate the new COG for the assebmly.

Anyone with good ideas?

Distinguished Mentor
swhite
Posts: 531
Registered: ‎11-08-2012
Message 2 of 8 (932 Views)

Re: Center of Gravity of Surface models or Mesh Features

04-29-2013 11:19 AM in reply to: jonselzer

Have you tried extruding or thickening the mesh surfaces to create a solid?

Steven White
Lee C. Moore, Inc.
www.lcm-wci.com
Inventor 2011
Intel Dual Xeon E31225 @ 3.1 GHz CPU
16 GB RAM
NVIDIA Quadro 600 GPU
Windows 7 - 64 Bit
Active Contributor
jonselzer
Posts: 34
Registered: ‎01-13-2011
Message 3 of 8 (926 Views)

Re: Center of Gravity of Surface models or Mesh Features

04-29-2013 11:22 AM in reply to: swhite

If you were to convert all of the solids that you can on these files.  They end up with hundreds of solids and a dozens of surfaces, creating files that are too large to handle (>120MB per file).  This is why there is a mix of solids, surfaces and meshes.

 

 

*Expert Elite*
blair
Posts: 4,494
Registered: ‎11-13-2006
Message 4 of 8 (898 Views)

Re: Center of Gravity of Surface models or Mesh Features

04-29-2013 08:11 PM in reply to: jonselzer

I guess if you know what the Mass is and where the COG is suppose to be, just manually enter the values in the iProperties-Physical tab for the Mass and XZY location.

 

I would test it with a simple model before passing it off to the shop/field just to verify when using Over-ride values.

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jonselzer
Posts: 34
Registered: ‎01-13-2011
Message 5 of 8 (891 Views)

Re: Center of Gravity of Surface models or Mesh Features

04-29-2013 08:23 PM in reply to: blair
You can only update the mass. This does not effect the COG. I would love to be able to modify the COG, but no dice.
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blair
Posts: 4,494
Registered: ‎11-13-2006
Message 6 of 8 (886 Views)

Re: Center of Gravity of Surface models or Mesh Features

04-29-2013 10:51 PM in reply to: jonselzer

It might be accessable via iLogic.

 

Or create a new IAM for each Mesh/surface part and place a IPT with the correct mass at the CG point you have determined as correct.

 

It would mean having to create a new IAM to get your total mass and correct COG

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jonselzer
Posts: 34
Registered: ‎01-13-2011
Message 7 of 8 (874 Views)

Re: Center of Gravity of Surface models or Mesh Features

04-30-2013 06:38 AM in reply to: blair

From iLogic you can read the COG.  However, you cannot change it thru iLogic.  It may be possible with VBA.  I posted that question to the Inventor Customization site, we will see what is doable.

 

 

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mrattray
Posts: 2,538
Registered: ‎09-13-2011
Message 8 of 8 (872 Views)

Re: Center of Gravity of Surface models or Mesh Features

04-30-2013 06:44 AM in reply to: jonselzer
There's very few things that you can do with the API that can't be done through the UI. Pretty much the only thing I'm aware of is creating additional property sets and working with entity attributes.
I checked in the API's object browser and a part's physical properties object (which includes its CoG) is marked as read-only, so you wont be able to change it by any method.
Mike (not Matt) Rattray

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