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james.g.turner61-Visitor
1-Visitor
February 20, 2015
Solved

Mixed part units in assembly results in incorrect weight calculation for the assembly. Fix?

  • February 20, 2015
  • 4 replies
  • 4024 views

Is there a fix for this? Getting an incorrect weight result for the overall assembly when using part files that have been created with different units.

Thanks.


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Best answer by dgschaefer

I've found that Proe / Creo does not handle mixed units well if some are mass based and others are force based. If all are one or the other, things generally go well.

4 replies

Mahesh_Sharma
Mahesh_Sharma22-Sapphire I
22-Sapphire I
February 20, 2015

You may need to change the units of all parts in assembly. If you are working with Creo 2.0, you can change the units of all part in one step from assembly using File > Prepare > Model Properties > Units > Change > Check Include Submodels > Set

    D
    dschenken1-Visitor
    1-Visitor
    February 20, 2015

    Why do you think you have the incorrect mass?

    Are there simplified reps involved?

    Look at the output of the analysis to see what components were included, what their density is, and what their calculated mass is.

    M
    mdebower18-Opal
    18-Opal
    February 20, 2015

    I usually have pretty good luck with mixed unit assemblies calculating correctly. I would look to see if there is a component model that doesn't have a material or density assigned.

    Another thing to check are the units of the assembly itself. Are the units set to what you expect.

    Another thing are unregenerated parts, or failed features that can mess up the mass calculation as well.

    D
    dgschaefer21-Topaz IIAnswer
    21-Topaz II
    February 20, 2015

    I've found that Proe / Creo does not handle mixed units well if some are mass based and others are force based. If all are one or the other, things generally go well.

      J
      james.g.turner61-VisitorAuthor
      1-Visitor
      February 23, 2015

      Thank you, that's exactly the issue I am having. We have legacy data that is in forced based units and our new models are mass based. The assembly weight is incorrect and most of the older files are released in Windchill and can't be changed without a major process.

      D
      dgschaefer21-Topaz II
      21-Topaz II
      February 23, 2015

      It's frustrating, because there's no reason why Creo shouldn't be able to figure this out. Gravity is pretty consistent for most users outside of aerospace. i would think that they could make this work for the vast majority that only think of gravity as a single constant and provide a few simple config options could account for the few users that need varying values for gravity.

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