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Large 3 stage planetary gearbox

by mcentric, published

Large 3 stage planetary gearbox by mcentric Jun 21, 2012
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Summary

I don't know if this is truly a derivative, as it was designed from scratch. But I did get inspired by aubenc's tiny planetary gear set ( http://www.thingiverse.com/thing:23030 ), so credit where credit is due :)

It was printed on A PP3DP UP!

EDIT: I previously wrote that the reduction ratio was 12.7:1. That is actually not true. The correct ratio is 3.33:1 pr. stage and 37:1 at the output shaft.

I designed it to show the capabilities of the UP! compared to the 20 times more expensive Dimension uPrint we also have at the institute.
It also shows our students that they can try out mechanical models designed in Solidworks without calculating in the rediculous material cost of the uPrint.

EDIT: I've added a ZIP file of all the components.... don't know why I didn't do this right away.... d'oh!

Instructions

The settings used on the UP! are:
.3mm z resolution
loose fill
4 layer surface depth

Most of the parts snap together fairly easily, but the square shaft is a pretty tight fit in the sun gear.
To make the lid easier to get on and off sand the surface of the pins on the lid with some 80 grit sandpaper.

The grip of the handle should rotate freely with the support removed

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Hi! Would you please send me the pitch diameter and the number of teeth on each gear. I would like to do a similar one myself.

Sorry for the very late reply!
I am afraid I cant find the original CAD file anymore. If I happen to find it I will certainly post it.

Cool!
Keep us updated.

Printed in PLA and tested it. Any amount of continuous use at decent speed causes heat and parts quickly bind up. I used silicon spray lube. Maybe with a grease it may have lasted longer not sure. Up till it bound up it worked perfect. I connected the end to a motor and you could not physically stop the secondary side as it had so much torque! I may redesign with larger holes in gears for bearings. The drive ends also as the primary side the whole drive melted right into the cap and I could not seperate them. The gears in PLA mesh well and seemed to work perfect, just need bearings. ABS may be a different story.

Thanks for trying it out!
The addition of bearings would definitely be necessary if used for any length of time. I designed it solely as a demonstration model, thus the hand crank ;)
Would love to see it redesigned and used in an application.

hi, could you please upload sldprt?? much appreciated

Sorry for the slow reply. I've added a pack & go zip file of the SW assembly

This has to be printed with support right? And how hard was it to remove the support material?

yes, there was some sparse support under the mounting hole tabs in the main "barrel". With the UP! the support was quite easy to remove. You'll probably have to to a little scraping and adjusting anyway, depending on your print quality obviously.

Nice! So what CAD system did you use for this gearbox, SCAD? Do you plan on publishing the script?

thanks :)
Sorry for the slow reply. The gearbox is modelled in SolidWorks. I'll add the sldprt file if anyone is interested.

Has anyone performed a torque analysis on this assembly?

I'm a software developer, not an engineer. I have an interest in robotics. I'm trying to determine whether or not printed gearboxes can be used to do real work. How much torque can they stand? What RPM can they sustain? What sort of lubricant is required to operate?

Sorry for the really late reply! No function analysis of any kind has been done on it. It is purely for demonstration purposes :)

Because I could only click once...

I like it! I like it! I like it! I like it! I like it! I like it! :-D

Thanks :)

What mine is lacking, compared to yours, is the ability to see the gears in motion. I plan on making a new ring gear from layers of laser cut acrylic... when our laser cutter arrives that is :D

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