Linking a Gear to an Axle

Thu, 19 Feb 2015

While I’m prototyping the gears on my wooden automata I need to be able to assemble and disassemble the model so that I can experiment with designs.

I’ve tried all sorts of design variations. Brass axles, grub screws, flanges, perspex joints. Finally I feel like I have settled on a consistent design. I’m using 12mm dowel for the axles and a keyway in the gear’s axle hole to hold the gears in position.

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I drill a couple of small holes in the dowel in the place where the gear is being fitted. The holes don’t go all the way through the axle. I then make a curve-topped staple from a short length of 1mm diameter wire.gear-a02

The staple fits into the two holes, the fact that it is curve-topped ensures that the centre of the staple is raised above the dowel.

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The gear then slips onto the shaft with the keyway located over the staple. The staple works to stop the gear rotating out of position. Perfect!gear-a04

Here’s a sample of the gears in position. Looking good!gear-a05

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