Polycord Slippage

[Phyrxes]

Here is sample of ours from a past robot.

The rectangles with the diagonals are cut out to create gaps for the cords to move through. This particular one was designed to keep two bunches of cords together, not space individual cords. The final version that was use was significantly less material but this was the first iteration.

Circles are rivets to attach this to the bottom (or top) of piece spanning the run.

We usually make the comb out of hdpe or nylon.

[Chris Fultz]

In the past, we have used PVC pipe (1-1/4 size, which is 1-5/8 OD) and then used the couplings as cord spacers. With 3/16 cord, we had about 5/16+ spacing.

Using bearings in the ends of the rollers helps considerably. There is a lot of tension on the tubes from the belts, and having a solid rolling surface for the bolts / axles is important.

We have used a 90% belt size in the past with no issues. They are tight, but stay tight through the season.

[AdamHeard]

It's also possible the belts are too loose and aren't getting enough normal force to get enough traction.

A more likely issue is a sheave that is not stiff enough causing friction through deflection.

[de_]

add an adjustable belt tensioner