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BobCondra1-Visitor
1-Visitor
November 13, 2014
Question

Create COG Point that Dynamically Updates

  • November 13, 2014
  • 4 replies
  • 2203 views
I have a model that I need to measure the distance from a surface to the center of gravity of the part. I need to be able to tweak the geometry so that this distance is the value that I need.

When I use the Mass Properties function, it shows what appears to be a coordinate system at the center of gravity. Is there any way to save this coordinate system, or create a point at the center of gravity? I could then use this to measure from the COG to my surface and watch it change with the geometry updates.


Thanks,

Bob




Bob Condra

Mechanical Engineer



Trijicon,Inc.

248-960-7700 Ext.1147

49385 Shafer Avenue | P.O. Box 930059

Wixom, Michigan 48393 US

- | www.trijicon.com



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4 replies

R
RandyJones20-Turquoise
20-Turquoise
November 13, 2014
On 11/13/14 13:10, Bob Condra wrote:
>
> I have a model that I need to measure the distance from a surface to the center of gravity of the part. I need to be able to tweak the geometry so that this distance is the value that I need.
>
> When I use the Mass Properties function, it shows what appears to be a coordinate system at the center of gravity. Is there any way to save this coordinate system, or create a point at the center of gravity?
>

Simply choose to create a feature and then select point:
B
BobCondra1-VisitorAuthor
1-Visitor
November 13, 2014
Randy,

Thanks for the quick response. This would be easy, except we do not have BMX.

Is there another way around it if we do not have BMX? Is there a way to extract the information from the MassProperties feature? Maybe through relations?

Thanks,

Bob




Bob Condra

Mechanical Engineer



Trijicon,Inc.

248-960-7700 Ext.1147

49385 Shafer Avenue | P.O. Box 930059

Wixom, Michigan 48393 US

- | www.trijicon.com
R
RandyJones20-Turquoise
20-Turquoise
November 13, 2014
On 11/13/14 13:47, Bob Condra wrote:
>
> Randy,
>
> Thanks for the quick response. This would be easy, except we do not have BMX.
>
> Is there another way around it if we do not have BMX?
>

Yes. You can still create a feature and create xcog, ycog, and zcog parameters. Then simply create a (offset from coordinate system) point and use relations to make the points dimensions equal to the *cog parameters.

> Is there a way to extract the information from the MassProperties feature? Maybe through relations?
>
> Thanks,
>
> Bob
>
> **
>
> *
>
> Bob Condra
>
> *
>
> **Mechanical Engineer
>
> **
>
> Trijicon,Inc.
>
> 248-960-7700 Ext.1147
>
> 49385 Shafer Avenue | P.O. Box 930059
>
> Wixom, Michigan 48393 US
>
> - | www.trijicon.com
>
> *From:*Randy Jones [ |www.trijicon.com <">http://www.trijicon.com>
>
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> /This electronic message contains information that may be confidential, privileged, proprietary, or subject to the export control laws of the United States, including the Arms Export Control Act (22 U.S.C. 2571 et seq.), the International Traffic in Arms Regulations (22 C.F.R. Part 120 et seq.),
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> --
> ------------------------------------------------------------------------
> Randy Jones
> Systems Administrator
> Great Plains Mfg., Inc.
> 1525 E North St
> PO Box 5060
> Salina, KS USA 67401
> email:- <">mailto:->
> Phone: 785-823-3276
> Fax: 785-667-2695
> ------------------------------------------------------------------------


--
------------------------------------------------------------------------
Randy Jones
Systems Administrator
Great Plains Mfg., Inc.
1525 E North St
PO Box 5060
Salina, KS USA 67401
email: -
Phone: 785-823-3276
Fax: 785-667-2695
------------------------------------------------------------------------

B
BobCondra1-VisitorAuthor
1-Visitor
November 13, 2014
I have received a couple of other responses, and they both use the same basic methodology. Using the general mass properties features.

The issue is that a model regeneration does not update the mass properties values. It requires a manual update of the mass properties. The screen shot below shows generally how I have done this with a relation. The d26, d27, and d28 are the x,y,z offsets for my ‘CENTEROFGRAVITY’ coordinate system.

I also have a feature called MASS_PROP_1, which contains the center of gravity information, and this COG updates with every regeneration. Is there a way to extract the x,y,z data from this feature?
[cid:image001.jpg@01CFFF62.E35D3C90]

Thanks,

Bob




Bob Condra

Mechanical Engineer



Trijicon,Inc.

248-960-7700 Ext.1147

49385 Shafer Avenue | P.O. Box 930059

Wixom, Michigan 48393 US

- | www.trijicon.com
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