Pinion design prototype

Sat, 11 Oct 2014

I’m still experimenting with gear design. In the previous version the pinion (the small gear) had the teeth wrapped around a central single flat disk. Simple(ish) to make but prone to tilt over. A disk at each end would keep the gear straight and level so here we go.

I’ve started with a short central core, added a disk at one end and some white support pieces…


…then added a second disk to the top making a sandwich core.


I’ve made the teeth from twelve individual triangle sections glued together.


The teeth are wrapped around the cental core.


And here’s the finished pinion!

I fitted into the box from my previous model and it runs beatifully smoothly. I still have an issue where the pinion can drive the larger gear but the larger gear can’t drive the pinion. Further experiments needed I reckon.

Comments (5)

  • Shelley October 11, 2014 at 11:01 pm

    It’s beautiful even as a

    It's beautiful even as a paper sculptural object. But taken to a whole other level b/c it is also functional!

  • Smelter October 12, 2014 at 9:01 am

    What a shame to hide the

    What a shame to hide the internals of this gear.

    The Victorians loved to show them off.

    • 1941jeep October 13, 2014 at 10:51 am

      I believe that is a windup

      I believe that is a windup gear from a Wardwell braiding machine. It is a cast iron gear used to drive the windup reel for the wire. Circa 1940-50. We still use them today to braid wire for high temperature applications at my shop.

      Fantastic! Thanks for that insight. thanks for the picture as well Smelter. I love the extra attention detail to make mechanical parts not just functional but beautiful as well. – RI

    • michael42er October 28, 2014 at 6:31 pm

      Hello Smelter,
      you are always

      Hello Smelter,

      you are always successful in finding Interesting. Here a implementationof the gearwheel  forthe gearbox 2 to 1. See also Blog post 1311.

      Gearbox 12 to 23

      • Smelter October 28, 2014 at 8:58 pm

        Hi Michael, you have a nice

        Hi Michael, you have a nice interpretation there. Curved spokes have more than just good looks, they are used as shock absorbers to dampen down impact loads in mechanical gear trains.

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