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-
3. then use the Mass properties function
I hope this helps.
Send reply to: seaint(--nospam--at)seaint.org
From: "Fountain Conner" <fconner(--nospam--at)pcola.gulf.net>
Subject: Off topic, Moment of Inertia
Date sent: Thu, 10 Feb 2000 12:45:05 -0600
> 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