Wormscrew gearbox

by ginge, published

Wormscrew gearbox by ginge Mar 9, 2013



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A gearbox designed around a large servo motor, a wormscrew gearbox with 13:1 gear ratio.

The drive horns go through both sides of the gearbox.
The potentiometer is mounted to the gearbox indirectly using an involute gear.

UPDATE: Use the -1 files. They are newer and make screwing the gearbox together easier.



  • 2x 30mm bearings (SKF 68062RS 30x42x7mm)
  • 1x 8mm bearing (SKF 608ZZ 8x22x7mm)

All parts can be printed at 0.3mm EXCEPT the gearboxscrew.stl

1) print
2) assemble

slice gearboxscrew.stl at 0.2mm or less. Print very slowly with a fan as this has lots of steep angles

Servo modification:
You will need to take the servo apart and modify it to allow continuous rotation

  • unscrew servo
  • remove motor board
  • remove potentiometer screw and potentiometer
  • under the main gear on top, remove the white plastic piece that the pot was pushed into.
  • Saw/cut the pillar of the main servo horn head

All parts should go togther as per the exploded diagram.
Once assembled, push the potentiometer through the hole in part "bottom plate pot holder"
attach with a screw

Special Mention:
Although this gearbox was designed independatly of hairygael's "inmoov" gearbox design, there was a heavy dose of inspiration from the "inmoov" design. Once I saw that design, mine chaged slightly.

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please tell me the size of your servo? Thanks.

What motor fits this gearbox? Thanks.

I printed this out and there are a couple of things I can't quite get? The small gear seems to do nothing or is missing a takeoff shaft and another gear? The washer/spacer is shown but not listed in the printables. It is interesting, not sure what i'll do with it but i would like to finish what i started. thanks

Can you list what servo you use?

Is the bearing meant to be SKF 62062 (which is 30 x 62 x 16), or should it be 30 x 42 x 7 (which is a 68062) ?? I guess it's the latter. Please confirm and correct.

Oh No! You are indeed correct. The larger bearings are for the lower torso.

Sorry about that, it is corrected