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  • Internal Gear Teeth

    Discussion in 'SolidWorks' started by 1john, Dec 1, 2012.

    1. 1john

      1john New Member

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      Solid works user
      How can I model a Radial Rack whose teeth form are accurate.
      I wish to wire erode the tooth form.
       
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    3. MichaelCreighton

      MichaelCreighton Member

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      Use the Tolobox Add-in in SolidWorks to create an Internal Spur Gear. Then cut away whatever part of the gear you don't need. Then you can combine/merge the gear teeth with the rest of your part.
       
    4. 1john

      1john New Member

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      Internal Gear Teeth - Accuracy

      Michael,
      Thank you for your reply
      The gear teeth in the toolbox don't seem to be very accurate. I was hoping for a true involute tooth form.
       
    5. MichaelCreighton

      MichaelCreighton Member

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      Ok. How about this: Go to Stock Drive Products' website and look through the internal gears until you find one that is appropriately sized for your application. Download the 3D cad file of that part. Again, you can combine/merge that part to your existing design and cut away whatever you don't need. Their 3D cad files might be more accurate than the SolidWorks toolbox.
       
    6. lockbits

      lockbits Member

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      I'm not sure what you mean by 'radial rack', are you simply looking for information on how to sketch an involute curve, or ar you looking to find out how to design an internal gear ring?
       
    7. 1john

      1john New Member

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      By radial Rack I mean like a straight rack but where the teeth are on a circular pitch. This is to radially open a plastcs die
      So effectively a segment of a internal gear ring.
      The radius of the pitch circle is around 25 inches.
      How do I sketch an involute tooth on a curved pitch circle?
       
    8. 1john

      1john New Member

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      Thank you for your response, I have checked to stock parts but the radius of the pitch circle is around 25 inches.
       
    9. MichaelCreighton

      MichaelCreighton Member

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      25" radius is pretty large. What pitch are you using? How large is your pinon gear? If the pitch is small enough, and your design doesn't have to be 100% exact (room for a small amount of error), you could probably just approximate the arc of a 25" radius as a straight line. Just design your involute teeth as if they are on straight rack but position them in an arc pattern.
       
    10. MichaelCreighton

      MichaelCreighton Member

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      I am not sure if you have access to MasterCAM, but you can create custom gears in that software. Then you can export a .dxf from MasterCAM and open it in SolidWorks to create a solid part file.
       
    11. lockbits

      lockbits Member

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      involute


      Is there any way to include a sketch on here of what you're after? I'm a little slow this morning and can't picture it, but I'm reasonably sure if I saw a sketch, I could help.
       

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