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Nema 17 Stepper 5:1 Planetary Gearbox with 5mm shaft for GT2 pulley

by stanoba Nov 19, 2015
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someone tried to stack them?

Printed one using formfutura carbon reinforced pet g for my extruder that was skipping steps, printed really well and the bearings and bolts pressed in really snug. The gears did need a some needle filing and wearing in with a drill, as a bit tight side, but better that than having sloppy backlash. Many thanks.

Building one for my telescope focuser. Will be paired with a 0.9deg stepper motor. Printing in Taulman alloy 910(nylon)

I'm trying to design a gear system to get a much better mechanical resolution with my printer (I don't like micro stepping) and don't have access to a decent gear generator like in Inventor, so I'm drawing these involute gear teeth by hand. Would you be willing to quickly whip up a double-step reduction? If not I'm sure I'll get there eventually.

EDIT: A 5:1 reduction gives a 200 step motor a resolution of 40 microns. Repeat that and we have 8 microns.

Fusion 360 is kind of freeware for personal projects and has a decent gear generator

I like this. This may be just what I need and save me some time designing one! Do the gears use involute curves?

Hi! Does bearings need heat to be inserted? I scaled up the model and still dont fit :/ They are super tight, is it normal?¿

Hi, yes, it's normal. You can use sandpaper to make the hole bigger or preheat ball bearings. It really depends on filament you printing from (PET in my case) and slicer / slicer settings. Beside that, I'm printing with additional fan during the print and the printout is really precise.

Yes, they are for mounting. But you can use other version of cover (without threaded inserts), remove two screws diagonal and use them for mounting.

So they are optional, arent they? Another doubt: Could an 8mm shaft be used?Thank you for posting this design :)

Yes, they are optional as mentioned before. If you need 8mm shaft, use the other remix of original design here: http://www.thingiverse.com/thing:20884

Compact Planetary Gearbox

Oh thank you so much! :)

are the threaded inserts for mounting?
I guess the top cover could be thicker to allow for m3 nuts to be inserted above the m3 bolts to allow for normal M3 mounting screws.
your thoughts?