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Originally Posted by Ogre
Does anyone have pictures or drawings of hubs that their team has used for Colson wheels?
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Ogre,
We used these wheels last year and this year. Both years we manufactured hubs without a drawing. We used the 4"x2" wheels last year and the 5"x2" wheels this year. Both styles have a 1-3/16" bore.
We just took 1.25" alu rod, turned it down to 1-3/16", knurled the outside, bored a 1/2" hole and put a 1/8" keyway in that hole. The hubs are pressed in to the wheel. The knurl bites into the plastic on the wheel pretty well especially in the middle due to the draft (Draft is what allows the plastic to be released fromt he mold, the edges perpendicular to the mold halves are sloped a bit making the bore narrower in the center).
We then key the wheel to a shaft and also key drive sprockets to that shaft. The shaft has stepped ends with flanged bronze bushings on them. We just put the bushings through holes in the kit frame and are good to go.
We ran all year last year with zero maintenence on this system, and are hoping for the same success this year. Traction is not as much as you get with some other materials, but was plenty for any pushing and "vigourous robot interation" that we encountered last year.
I love these wheels because they are cheap, simple, robust and easy to get up and running.
Good luck everyone!
Rob