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Hypocycloid gearbox for Nema 14/17

by JEdren, published

Hypocycloid gearbox for Nema 14/17 by JEdren Jan 18, 2013
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This is a 1:56 speed reducing gearbox for a nema 14 or Nema 17 stepper motor.


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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Hello, I have been working on a 100:1 hypocycloid gearbox to be connected to a NEMA 23 stepper motor. I have been able to get it running and it is giving me the speed reduction that I wanted, but it is not giving me enough torque. It was only able to lift about 2.5 ft lbs and I was curious if you have tested this gear box for torque, or if there are any factors that you have ran into that may have not let the full torque be exposed. Mathematically it should be giving me really high torques but I cannot seem to get the torque out of it. Anything you can help me with would be great! Thank you, Eric

Its seam that the ratio of your gearbox give 64:1 instead of 56:1

dual ratio the way it work is if gearbox are like this:

9 -> 8 (first gear) 7 (static, move because of first) -> 8 (output final gear)
stage 1 = teeth count (first rotating gear 8)
stage 2 = teeth count (last rotating gear 8)

ratio = stage 1 * stage 2 = 64

Sep 11, 2014 - Modified Sep 11, 2014

Trying to print this today. What do you do about the tolerances? My parts fit together so snugly I can barely get them apart again.

See also http://www.thingiverse.com/thing:19649http://www.thingiverse.com/thi..., requires only one 608 bearing and shorter screws.

Hypocycloid Gear Test

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...)

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.

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.

Any news with the 1:8?

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).

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

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

Ok! There is now an additional file uploaded with space for the M3 heads. 4mm deep