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Re: Off topic, Moment of Inertia

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The method I have used with reasonable results is as follows:

1. Center the shape about the origin (0,0,0) for a rectangle, circle 
etc, the centroid will be at 0,0,0
2. Convert the shape to a region.(Using the pulldown menu : Draw-
>region)
3. then use the Mass properties function

I hope this helps.

Peter McCormack

Send reply to:  	seaint(--nospam--at)seaint.org
From:           	"Fountain Conner" <fconner(--nospam--at)pcola.gulf.net>
To:             	<seaint(--nospam--at)seaint.org>
Subject:        	Off topic, Moment of Inertia
Date sent:      	Thu, 10 Feb 2000 12:45:05 -0600
Organization:   	http://www.seaint.org

> 
> Does anyone have an ACAD Lisp routine that will reliably calculate the
> moment of inertia of a shape once it's drawn?
> 
> I tried one, but it wasn't too accurate -- even on a simple rectanguar
> section.  Build-up sections were worse.
> 
> Thank you,
> 
> Fountain E. Conner, P.E.
> 1724 Beaver Pond Rd.
> Gulf Breeze, Fl. 32561
>    Phone 850-932-5547
>    Fax      850-934-1916
> 
>