by emmett, published
It is a planetary gearset and functions like a cross between a needle bearing and a thrust bearing. No cage is required to keep the rollers in place, because their gearing keeps them perfectly spaced. The gears are all herringbone, which is why it cannot be disassembled and also why it can act as a thrust bearing. If you're wondering how well a 3D printed bearing could work under load, please check out my video: youtu.be/ZghwSBiM0sU
This design is fully parametric and made to be adjusted in the Customizer app to whatever you need. Thanks to aubenc for finding a problem in the first version.
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Excellent! This is the first successful object with moving parts that I have been able to print on my newly constructed Reprappro Omerod. Printing at a tolerance of 0.15mm I did not think would free up, so I tried it at 0.4mm which was too loose but worked straight away. Subsequently with a bit of persuasion freed up but was a bit bumpy. I'm now going for 0.24mm. Thank you for posting this Thing.
Stratasys just used this model to announce their objet500 connex3
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You can adjust the tolerance in Customizer if you need. You can also change the dimensions, numbers of planets, numbers of teeth, etc. Normal gears use a small pressure angle in order to transmit torque, but here I use a large pressure angle so that they transmit force better (hence why they look more pointed than usual). Your chosen number of sun gear teeth is approximate because planetary gearboxes turn out to be quite constrained in terms of what tooth numbers will fit. See the beginning of my code for the equation I came up with.
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