[Not2B]

Well, I'm not saying they are good... but... here is what we did with next to no tools.

(1) 12" long 1" PVC tube
(2) 1" long 1" PVC tube
(2) 1" PVC coupler
(2) Bearing that comes with the skyway wheels (we ordered a bunch of them)
(1) metal shaft

- Drop the bearing into the coupler. There is a lip on the inside of the coupler that will stop the bearing from passing through.
- Sandwich the bearing between the lip and a 1" hunk of PVC. Make sure the bearing you have doesn't get squished by PVC and make sure it still spins freely.
- Push this unit onto the 12" long PVC tube
- Do the same on the other side.
- Run rod down the center
- The roller should now spin freely on a stationary shaft.

Now to the powering it part. We are using timing pulleys and belts. Replace the timing pulley set screw with a LONGER screw. Loctite or fix it so that it doesn't touch the metal rod. Slip pulley onto rod, with the hub fitting into the 1" PVC. (Buy a pulley so that the hub will FIT inside the 1" PVC also.) Dremel a notch into the PVC for the long setscrew replacement. When we mounted the rollers, we also used spacers to hold the pulleys in place. It freaks the students out, but when it's all spaced out, nothing can come apart.

Seems to be working right now... cheap, light, and easy to set up roller assy line staffed with people new to robotics.