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Unread 20-01-2009, 22:49
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Re: PVC to wood bearings??

We're using ABS (black plastic sewer pipe) for our rollers, and we have a wood robot they are mounted to. They are mostly all chain driven.

We discovered that the 3" ABS caps that some stores sell are flat on the ends, and also they are a pretty close fit to the inside of 4" ABS pipe, as well as to the outside of 3" abs pipe, so the 3" caps can be used for two different sized rollers.

There is a neat thing called a "flanged radial ball bearing", and it can be used in a chain sprocket, or put into a hole drilled in that ABS end cap. When the bearing is supported on the end of a bolt, then you have a complete roller, and it's pretty easy to make it driven by a motor/transmission by #35 chain (same as the drive wheels use).



this is the cap with a sprocket installed, and an FR8ZZ bearing installed. This is the type of sprocket that came in the kit, and it needs to have the hole slightly enlarged (a half round file will work) to make the bearing fit. You can drill the 1-1/8" hole in the cap with a "Forstner Bit", and it should give a good fit for the bearing in the end cap for the other end of the roller.