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mburlone10-Marble
10-Marble
April 15, 2020
Question

Looking for a named parameter for gear ratio that I can use in a relation

  • April 15, 2020
  • 3 replies
  • 1917 views

I have an assembly that includes a Gear Pair connection defined in the Mechanism Application.  The models of the gear components themselves are adjustable based on a few input parameters like tooth count, and module etc.

 

However, if I change the tooth count of either of the gears, I have to manually re-input the new gear ratio in the assembly model.  I'm looking for a way to relate the gear ratio in the assembly to these same component parameters, but I cannot find the name of the variable to use for this gear ratio.

 

How do I find the names of the dimension/parameters in a GearPair connection?

 

Thank you,

3 replies

T
TomU23-Emerald IV
23-Emerald IV
April 15, 2020

To the best of my knowledge, most of the mechanism "stuff", including gears, cannot be controlled outside of the interface where they are created.  See https://community.ptc.com/t5/Creo-Parametric-Ideas/Mechanism-Set-Gear-Pitch-Circle-via-Parameter-or-Relations/idi-p/456363

    M
    mburlone10-MarbleAuthor
    10-Marble
    April 15, 2020

    Hmmm, that's frustrating; especially since there are parameters for more obscure variables in other types of connections.  In the relations window under Local Parameters, if I filter by Current and all sublevels, I can see parameters for kinetic friction and restitution of each of the joints.  Even the coefficients of servomotor profiles can be found here.  But sadly, I see no such parameter for gear ratio.

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      pausob19-Tanzanite
      19-Tanzanite
      April 15, 2020

      I checked the same as you and came up with the same lack of results.  No parameters accessible for the gear connections.  This software should be called "Creo (mostly)Parametric"

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