Plastic whiskers on central spindle: Design Secrets Revealed

[Tom Line]

We used PVC rollers, with pneumatic tubing.

A VERY easy way to secure the tubing was to drill a whole just a tiny bit undersized in the PVC, then run a short fastener into the end of the tubing in the PVC (requires drilling a hole on the opposite side of the PVC to insert the fastener).

[gorrilla]

Originally Posted by Tom Line

We used PVC rollers, with pneumatic tubing.

A VERY easy way to secure the tubing was to drill a whole just a tiny bit undersized in the PVC, then run a short fastener into the end of the tubing in the PVC (requires drilling a hole on the opposite side of the PVC to insert the fastener).

alternatively to save a little weight...

just drill a hole in each side at 90' degreee angles and stick the tubing through both(they havent come out of ours at 550rpm)

and to power it easily, if your using 4' PVC just screw a cleanout of the bottom and attach a 1' square tube to a motor and slide everything in place

[Brian C]

Team 1468 used pneumatic tubing from the KOP. The central spindle was a 1" square piece of 8020 tubing with holes drilled through it for the tubing. It was actually one long piece of tubing which was threaded continuosly from one end of the 40" long spindle to the other. This gave us loops sticking out of the spindle to push the balls up. We found that this worked out better than having small tubing sticking out. Tapping 1/4-20 threads into each end of the 8020 made it real easy to bolt on bearings to the spindle.