Seven Tooth Pinion

Thu, 21 Feb 2013

For the next page of the forth coming Gear Zine I need a small drive gear to run against a larger gear. I've decided on a seven tooth gear. The teeth on smaller gears need a more pronounced curved surface than do the teeth on larger gears so I've opted for a gear made from double thickness card where the teeth profiles can be individually cut.

I've gone for the same round pin in a square tube layout as the other gears. The addition of the two green pieces hold the gear square against the axle.

And here's the result. Looking good so far!

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Comments (5)

  • Smelter February 22, 2013 at 8:51 am

    Looking like you’ve got the

    Looking like you've got the makings of an epicyclic gearbox there Rob.

    You might find this on-line calculator useful.



    You read my mind 🙂 – RI

    • Smelter February 24, 2013 at 3:40 pm

      Oops, Sorry. Didn’t intend to

      Oops, Sorry. Didn't intend to post a spoiler.

      But then if you will keep posting teasers! 🙂 

      No problem 🙂 Not sure if I can make an annular gear yet.- RI

  • krishnaconsu February 27, 2013 at 11:55 am

    Awesome way of

    Awesome way of designing….


    please keep posting such models for students


    Marathi Kavita

    • maxlrainer May 19, 2013 at 3:39 pm

      I found an interesting
      I found an interesting implementation of using this gears in a "bookwheel "
      You can find it here:

      Please consider "Quelle " at the bottom of the page in english:

      Thanks! Fascinating stuff! – RI

      • Smelter May 19, 2013 at 5:22 pm

        That method is still used in

        That method is still used in rotating jewelry display cases.

        And for pasties. – RI

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