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Beveled Gear Bearing

by NateTG, published

Beveled Gear Bearing by NateTG Apr 25, 2013
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4357Views 1202Downloads Found in Mechanical Toys
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Summary

An attempt at a beveled twisted planetary gear bearing. Inspired by Emmet.

Check handedness. Print 2 of the flat ones and 3 or more of the macaroons. Assembly should be pretty obvious.

Instructions

Looks like thingiverse has decide not to turn off "work-in-progress" automatically.

I printed a working centimeter scale prototype. Two copies of topbot2 and three or more of roller2. Under heavy axial loads it does pretty well.

six-18/18-six is a pair of bevel gears with a different tooth count ratio. In principle, the tooth counts of the large and small gears should be coprime to so that wear is even, but I doubt any of the builds will see enough use for it to matter.

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4357Views 1202Downloads Found in Mechanical Toys
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Beveled Gear Bearing by NateTG is licensed under the Creative Commons - Attribution license.

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How did you perform that transformation? I wonder if that functionality could be added to OpenSCAD...

Ignorantly...

I took the coordinates in the mesh file converted them from cartesian to cylindrical, and then plugged the result into spherical to cartesian conversion.

The transformation won't preserve circumference ratios, so it doesn't convert cylindrical gears to bevel gears in the way that I thought. Although the STL render might look nice at first glance, the distortion on the gears is pretty visible. It might be possible to use the transform on a gear-by-gear basis using some better sophistication.

A more generic version of the matrix transform would allow that sort of thing to be done, but that would also allow ways to break manifolds, and I'm not sure how useful it is.

I saw the feature request you made:
https://github.com/openscad/openscad/issues/273https://github.com/openscad/op...

It seems to me that the natural way to generate bevel gears is to do extrusion with spherical layers, which currently also isn't supported in OpenSCAD.

Interesting. At least you can always do bevel gears with Greg's library.

Greg's library doesn't seem too good for spiral bevel gears. I've almost got my own working. (Partial STLs are uploaded.)

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