On Sat, 05 Sep 2009 14:08:35 -0400, dave
wrote:

need to build a (retractable wheels) dolly for my big saw. the huge
motor, and other thick cast iron parts, stick out to one side, and
rearward. I'd prefer to space the wheels 'relative to' the center of
gravity, at least 'somewhat, anyway'.

this is the saw, or at least 'most of it' anyway
http://machines.2x.nu/unisaw_offloading/


if I lift the saw, and try 'balancing' it on, say, .500 diam round steel
rods, and find the 'balance center' left to right, then (use same
procedure to) find the balance center front to rear, is the center of
gravity ALWAYS over where the two lines intersect?

umm, it 'seems to me' like it is, but just checking here...

Yes.

Consider it from the other direction: imagine the object balanced on
a ball under its CG. If the ball is replaced with a rod, the object
will still be balanced in a direction perpendicular to the rod's axis.