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bikeman18 (Automotive) (OP)
3 Apr 07 14:10
In NX4, in the pull down (Analysis)mass properties,
tab, Create Principal Axes, is that the same as finding the center of gravity? If not, how can I get the C.G.??
phillpd (Mechanical)
3 Apr 07 14:24
I guess the easiest option is to click the "Keep Measure" icon. This will create an associative point object for you.

Specialty Engineered Automation
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Helpful Member!  JohnRBaker (Mechanical)
3 Apr 07 15:51
If you just want the CSYS at the Centroid but without saving the measurements, just toggle on the 'Create Principle CSYS' BEFORE you select a body.

John R. Baker, P.E.
Product 'Evangelist'
NX Product Line
UGS Corp
Cypress, CA
http://www.ugs.com
http://www.plmworld.org/museum/

cowski (Mechanical)
3 Apr 07 16:18
In NX2 and earlier there was an option for creating a point at the centroid (in place of or in addition to the CSYS). Is this still an option in NX4?
JohnRBaker (Mechanical)
3 Apr 07 16:38
In reality, a CSYS can be referenced as if it were a point, so just use the Principle Axis option.

John R. Baker, P.E.
Product 'Evangelist'
NX Product Line
UGS Corp
Cypress, CA
http://www.ugs.com
http://www.plmworld.org/museum/

Xwheelguy (Automotive)
3 Apr 07 18:17
bikeman18,

Select Measure Bodies, select the body and let the computer crank away for the results.  When it's finished, click the Information icon (large lowercase i) and the Center of Gravity will be listed as the Centroid in the upper portion of the Listing Window and also as Center of Mass beneath that.

Same thing John outlined but without creating anything "extra".

I haven't used the Keep Measure since NX3, but the last time I did, it created a point at the Center of Mass (Centroid) and would update after any model revisions.  Make it the very last feature if you want this to be associative.  Then after your model updates, all you need to do is an Info Object on the point to get the Centroid rather than waiting 2 times for the software to crunch the numbers. (Once for the onscreen information and a second time for the Listing Window information).

Tim Flater
Senior Designer
Enkei America, Inc.
www.enkei.com

Some people are like slinkies....they don't really have a purpose, but they still bring a smile to your face when you push them down the stairs.

Vikingbro (Industrial)
4 Apr 07 11:19
bikeman18,

To add to what Tim stated, this is what I do with the Keep Measurement point. In my line of work (putter design) weight is a HUGE concern.

When I do my mass measurement, I too keep this feature at the end of the feature tree so it always updates. The beauty for me is that I have the "Details" window open at the bottom of my 'Part Navigator' window, so all I have to do is select the body measurement in the model navigator and the details show up in the Details window. I don't even have to do an Info Object.

Now, you won't get all of the details that you would if you DO perform an Info Object, but for me, this works.

Good Luck!

Chris Cooper
Senior CAD Specialist
Cleveland Golf / Never Compromise
www.clevelandgolf.com
www.nevercompromise.com

jackley (Automotive)
5 Apr 07 9:45
I also use the Keep measurement feature.  Cost estimating here wants to know the volume of our suspension bushings and mounts.  (Rubber design)

I keep the measure body feature in our drawing formats.  Then link it to a note on the drawing through expressions.  So it's always correct to the math.

Justin Ackley
Designer
jackley@gmail.com

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