Set weight of part?

Hello All,

Is there any way to set the weight of a part, to be used in mass props of an
assembly?
I drew up a right angle gearbox, and would like to set the weight at 4 lbs.

TIA,
Muggs

 

Good idea, Thanks Dale!

Muggs

 

Same here.

WT

 

My collegue once made a 1" cube weigh 300lb because he didn't want to draw a
whole engine. Geee what kind of material is 300lb/1in^3. Kryptonite?
MyMaterialonite? =^)

 

there was a tv advertisment a while back for some science show describing
the density of a 1" cube at around a million pounds, material was from a
star (best as i can remember).

 

mass=density*volume
density=mass/volume

Get volume, set density accordingly.

 

not sure ... it may have been as much as 10~15 years ago when this ad aired
(PBS only, can't remember). i do remember being baffled as to how something
could be that dense. it might have just been speculation (from the
astronomers).

 

Black hole material?

WT

 

There's another trick if the center of gravity needs to be independently
located, as in a model of a purchased part (like a motor/gearbox) where
the external features are modeled to show appearance and fit, but none
of the internal parts are created.

Make the part with a density close to zero. Make a tiny sphere or cube
and give it a high density to match the weight of the real part. Put
them both into an assembly and mate the high density part so it's at the
desired location of the center of gravity. Save the assembly as a
2-body part, which now has the correct weight AND C.G. location.

Art W.

 

I should have mentioned that a part made this way still doesn't really
duplicate the "real" part. With all the mass concentrated at a point,
such things as radii of gyration and moments of inertia will be totally
bogus.

AW

 

Cute trick! I'll remember that one.

 

if you find out the volum of the part. you can reverse from that using
4 lbs to figure out what to set the dencity to.

hope this helps.

 

Would be way, way, WAY heavier than than a million pounds per cubic
inch. Just for grins . . . the density is theoretically "infinite", but
it's actually not even describable in those terms. Since light cannot
escape the gravity well Relativity breaks down at the "event horizon" of
a black hole and there becomes no meaning to the concept of "infinite".
One would need a workable theory of quantum gravity in order to quantify
the density, and we don't have one . . . yet (I'm workin' on it 8^P ).
SolidWorks is just the means to the end.

'Sporky'
"On the foreskin of technology"

 

Let me add something to the theoretical "wish list" of stuff for
Solidworks (and other CAD packages).

An object called "simple representation" which is drawn using any
combination of points, lines, solids, or 3-d faces, which can be
assigned a weight and moments of inertia.

This way we can use objects from 3-D model services (normally as
meshes) or even 2-D drawings from manufacturers in our designs without
all the hassle of re-creating them 3d in solidworks.

Joe