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mcentric

Large 3 stage planetary gearbox

by mcentric Jun 21, 2012
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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.

would you still need bearings if printed in nylon? I want to make a speed reduction box for a motor that runs around 1700rpm and was planning to use this design as a starting point

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