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Finding Moment of Inertia of Solids in AutoCAD

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I was able to do it by starting out as Gerard suggested.  First make a region 
out of the outer portion.  Next make a region out of one or more voids. Then 
use the "subtract" command in AutoCAD (you have to read the prompts carefully 
with this one) to pick the objects to be left, then the object to be 
subtracted.  You can check out what you have by using the "shade" command.  
As always, you have to move the whole thing to the origin or use the "ucs" 
command to move the origin to the c.g.  Don't use solids.  There was a thread 
on this within the past year.

Hope that helps,
Mark Johnson

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