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Complex Moving Mates Questions

SunkmailSunkmail Member Posts: 20 ✭✭✭
Trying to get a better handle on complex mates ...

How would you recreate this:  Reciprocating Rack & Pinion  in Onshape?    

I can see how it would be done if collision detecting mates were available, but I can't envision how to reproduce the movement with the available mate options.

Comments

  • cody_armstrongcody_armstrong Moderator, Onshape Employees, Developers Posts: 204
    @Sunkmail  Have you tried the Rack Pinion relation?
  • SunkmailSunkmail Member Posts: 20 ✭✭✭
    I haven't had a chance to yet ...

    Does that work with the drive shaft always turning in the same direction?    (Such as a linear motor)

    The sample in the video allows the drive shaft to maintain a constant rotational movement of the Pinion in a single direction.  
    The partially toothed gear will engage two (essentially) separate Racks for only a portion of each rotation, allowing the part with the two racks to oscillate back and forth repeatedly.


  • SunkmailSunkmail Member Posts: 20 ✭✭✭

    This is a OS Concept learning thing.    I don't have an actual finished product in mind.

    Here is a sample model of the idea:   Reciprocating Rack & Pinion     (I added a long handle to the pinion portion to make rotating easier.)

    From a practical standpoint, I don't think I got the right ratio of teeth in each portion to make it work properly, and the meshing may be too tight, but I think it shows what I'm trying to get my head around.
                      (I don't have any experience modeling gears prior to this attempt, so it may need tweaking.)

    @cody_armstrong  
            - Thanks for the advice, but I couldn't get the Rack & Pinion relation to work.  I'm still new to this though, so I may not have been doing it right.

    I was thinking the Tangent Mate maybe an option here, but doesn't work with this model.

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