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wfalco16-Pearl
16-Pearl
May 23, 2022
Solved

Weight of Shrink Wrapped Part

  • May 23, 2022
  • 2 replies
  • 4878 views

How do I assign a weight to a shrink wrapped part with no weight?

Best answer by tbraxton

If you only are concerned with the weight then create a solid sphere or cube inside the surface boundary of an arbitrary volume (i.e. 1 in^3). You can then assign the density in the part such that the volume of the solid feature multiplied by the density is equal to 2 pounds. Creo will then calculate the mass properties and the weight will be 2 Lbf.

2 replies

tbraxton
22-Sapphire II
tbraxton22-Sapphire II
22-Sapphire II
May 23, 2022

Assign the mass properties to the model. See details on how to do this in the link.

 

https://support.ptc.com/help/creo/creo_pma/usascii/index.html#page/model-based_definition%2FTo_Use_a_File_for_Assigning_Mass_Properties.html%23wwconnect_header 

tbraxton
22-Sapphire II
tbraxton22-Sapphire II
22-Sapphire II
May 23, 2022

I should have noted that you can use relations to control the assigned mass to the shrinkwrap part by using the mass property calculations of the parent model of the shrinkwrap such that it will always be accurate and current upon full regeneration. This way you will have accurate mass properties in any models using the shrinkwrap part(s).

    W
    wfalco16-PearlAuthor
    16-Pearl
    May 23, 2022

    Thanks! I hear what your saying about the relation to the model. I created a shrink wrap part independent of the model. It is a power supply with too much detail. No real need to update. I would like to assign a weight somehow. If it's relations, can you give me an example?

    S
    23-Emerald III
    StephenW23-Emerald III
    23-Emerald III
    May 23, 2022

    I've done this several ways in the past.

    If the shrinkwrap model has solid geometry, I will adjust the density of the shrinkwrap so that it matches the weight needed.

    If the model is a surface model AND I am concerned about CG location, I will add a small sphere at the CG location and adjust the diameter/density to match the desired weight.

    If you want to simply assign the weight, you can go to File - prepare - mass properties change and set the "define by" to assigned.

     

      W
      wfalco16-PearlAuthor
      16-Pearl
      May 23, 2022

      The shrink wrap is all surfaces.

      tbraxton
      22-Sapphire II
      tbraxton22-Sapphire IIAnswer
      22-Sapphire II
      May 23, 2022

      If you only are concerned with the weight then create a solid sphere or cube inside the surface boundary of an arbitrary volume (i.e. 1 in^3). You can then assign the density in the part such that the volume of the solid feature multiplied by the density is equal to 2 pounds. Creo will then calculate the mass properties and the weight will be 2 Lbf.

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