C of G on Origin

I posted once on this newsgroup and asked for a macro that would locate the
center of gravity of a part. I was obliged by someone that sent me a macro
that created a point at the CG. I would now like to further ask if, in a
macro the CG point relocate the part with the CG at the Origin. This would
then allow rotation about the CG.

Thanks,
Terry Robb

 

I would now like to further ask if, in a

This could be achieved easily by using a macro feature... You would just
insert a "relocation" feature, which would move the body to appropriate
location. Worth a try!

-h-

 

With SW2003 and above, moving a solid body with a macro can be
accomplished with the InsertMoveCopyBody2 command. You simply run
this command with the negatives of the values you obtained for the
center of gravity. Unless you do this repetitively, it is probably
not worth your while to develop the macro. Just goto Tools, Mass
Properties to get your CG values, then Insert, Features, Move/Copy,
select the solid body, and plug in the negative CG values to move your
origin to the CG. To move the solid body back, just suppress or
delete the Body-Move/Copy feature.

Kent

 

An alternative would be putting the part in an assembly with just the
part and mating the assembly origin to the CG sketch point. Then
create your axis of rotation....

Blair

 

With SW2003 and above, moving a solid body with a macro can be

By using macro feature instead of regular macro, you could take the part
body as an input parameter and multiply its translation matrix with inverse
values from mass properties. As a result, the macro feature would act like
move/copy body-feature, but it would automatically keep the body in a such
position that the origin would be in GG.

-h-

 

Back to your original question,

If you go to View, Modify, and leave Rotate About Screen Center
unchecked, won't SW rotate about the CG no matter where your model is
located? That's how it appears to me. If your trying to center the CG
on the screen, then create the point at the CG first and Zoom to
Selection, then Z out to the desired magnification. Or am I missing
something?

 

i dont think its COG. i think its center of overall size