Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Hypocycloid gearbox for Nema 14/17

by JEdren, published

Hypocycloid gearbox for Nema 14/17 by JEdren Jan 18, 2013


This is a 1:56 speed reducing gearbox for a nema 14 or Nema 17 stepper motor.

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See also http://www.thingiverse.com/thi..., requires only one 608 bearing and shorter screws.

Any news with the 1:8?

Thanks! The 2D would get me far. But actually if you aim to upload the 1:8 design soon I might just start with that.

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You will need some different ball bearings

2x : 10x15x4 mm
1x: 5x10x4 mm
1x: 8x22x7 (608zz)

The case is about 40mm long so at least 45mm long m3 screws.
One m8 bolt with a hex head, m8 washer and a nut.

For a low torque nema 14 excenter can be press fitted whithout glue or set-screw.

I have no idea how it will wear.
The plan is to swap the heavy/bulky nema 17 + gearbox extruder mechanism on my printer and the plan is to use a much smaller nema 14 motor.The m8 bolt output should be useful i hope as hobbed or maybe to use a bigger feed wheel to grip the filament.


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i-make-robots on Apr 5, 2013 said:

See also http://www.thingiverse.com/thi..., requires only one 608 bearing and shorter screws.

halldorion on Jan 28, 2013 said:

Hey this is fantastic! and just the solution to a very current problem. I will make a print and test this.

Any chance of a version for m5 output bolt?

Or if you can share your design files I could do it myself (.stl sucks in Rhino...)

JEdren on Jan 28, 2013 said:

I am actually working on a single step (1:8) with a m5 output at the moment.
I use an old academic version of solid edge so I think there might be very few that can read these files... But I will try to at least make a 2d .dxf file of the gears.

doctek on Jan 21, 2013 said:

I printed all the plastic parts. I don't have the bearings yet, so can't test it fully. It seems that the gear fits just a *bit* too tightly and won't rotate freely. I printed a second one at 95% in X and Y. It now seems just a bit too loose. I'll keep playing and see if I can find bearings as well.

Awesome thing! I hope to use it on my dual extruder to reduce the load on the NEMA 14's and keep them cooler (if necessary).

Derekmellott on Jan 20, 2013 said:

Would it be possible for you to modify the file to recess the M3 heads?

JEdren on Jan 20, 2013 said:

Do you mean in the top case piece so that the heads are flush with the outside?