Assigning the mass to a model

[gvs]

I wan to assign a mass to a model/assembley without assigning density.Is there a way to do this. CAn we do uit useing relation If yes how to write a relation for this.

 

[TrailBarge]

I'm going to assume that your are using some version of Wildfire.


If so, go to the mass properties section of the parameters.


There should be other tabs in that dialog... something like parameters and another called alternate mass properties. Go to the alternate mass props tab. I think you put a value in pro_mp_mass and throw a flag to back-calculate density from there.


If this does not work, don't use the parameters dialog, but the dialog where you set up the mass properties. File-options? Format-something or other? Anyway, there is a tab on THAT dialog that does what I described before.


I have a new job (using AutoCRAP) so my Pro/E is 9 months out of date and any memory of playing with this is at least that old, but the option IS in one of those two places, just tucked away on another tab.


Kinda reminds me of those SciFI novels about alternate universes just a vibration away. You've always been so close but never suspected it was there.


Let us all know which one of these was right.





G'luck

 

[Jacoolo]

Hello



There is a way to do this - Setup>Mass Props and than geometry and
Parameters > Edit> and put your value. There is one thing You
should know doing this - pro\e still will be calculating mass by itself
and in assembly your mass will not be included.



For more details please look in :



http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID= 22969&PN=2

 

[TrailBarge]

Yes, I recall something like that. I thought that the Setup > MassProps had been fixed in Wildfire and this was all old stuff. The salient post in the thread was the last one:


"The relation previously posted was close...but here's what I use.


mp_density=actual_weight/mp_volume("")


"Actual_Weight" will be your parameter for the known weight of the part. Make sure you regenerate a couple times before it can recognize the relation. And like muadib3d said...this weight will also be recognized in the assembly too."


The several-regen thing killed us more than once... and made it impossible to pull this stunt in a family tabled part. I think we wound up playing with the density untill we got the mass we wanted for each instance, then we put that arbitrary number as density in the family table. Not quick or intuitive. This was all pre-wildfire.


The problem was that the relations were run first, then the geometry generated. If the family table changed the geometry, all of the relations (i.e.: mp_density=actual_weight/mp_volume("") ) were run with the generic values.


I seem to recall seeing a new section of relations in wildfire. They now have post-regen relations. If you put the density relation here, it may work. I have not had the pleasure of using pro/e to this purpose since I saw the new relations section, so I don't KNOW that it works.


Anybody know?