Harmonic Gearbox for fine tuning.

VK3ZYZ

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After watching this Youtube video..
I thought it could be fun to try one of these gearboxes.My version is scaled up 1.25 times as that suited the bearings I had. 10mm diam, 4mm think with a 3mm center hole.
This is the result.
Photo on 10-4-25 at 11.32 am.jpg

It is quite a bit modified from the original, only the main gears are used as is, sort of.
The flex gear is printed with TPU 95A. It may work better with softer PTU.
1744248929145.jpeg
For those who feel like having a play, here are the files.
I have added a bearing in the top cover, and another on the bottom of the rotor.
Photo on 10-4-25 at 11.42 am #3.jpg
Photo on 10-4-25 at 11.42 am #2.jpg

The main body has 3 holes, both ends to be tapped M3, to hold the top on and mount the gearbox to a panel.
The crank handle is a mod of the one I did for the Spellbinder embosser...
Some lubrication helps.
This is a work in progress but I would be interested to see if others have a go at making one, with mods to suit.
 

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