Do you need a single pulley? A double? A triple? You can have 1,323 pulleys, or even more, all by stacking a single part! Our new stackable pulleys allow you to have as many (or as little) pulleys as you’d like by stacking a single part over and over and over. The stackable pulleys are designed to fit together seamlessly, and are sized such that the outer diameter of a 1/4” polycord cable on the pulley is either 1.625” or 2” to match with our flex wheel sizes.

Notable Features

• Same width as our original polycord pulleys in the same configuration

• Infinitely stackable

• Sized so that the polycord touches the object, not the pulley

• Designed with piloting pins and pockets to make assembly a breeze

The 1.625” and 2” pulleys are sized so that the OD of the polycord sits at either 1.625” or 2” diameter. The flange also sits slightly below this OD so the polycord will be the only part to contact the game object. This can be seen in the images below.

Align the pin on one Single slice with the matching pocket on the other Single slice. Install the desired amount of #2-28 screws to hold the pulley slices together. Be sure to tighten the screws fully. There should be no gap between the pulleys when they are assembled.

Align the pin on the Single slice with the matching pocket on the Middle slice. Install the desired amount of #2-28 screws to hold the pulley slices together. Be sure to tighten the screws fully. There should be no gap between the pulleys when they are assembled.

For the double pulleys, the screws will need to come from the inside of the pulley stack into the Single slice. For the final slice, the screw goes from the Single slice into the Double slice. This can be seen in the image below.

Polycord Pulleys

1.625" Pulley (1/4" Groove, Single) (WCP-0096)

1.625" Pulley Slice (1/4" Groove, Double) (WCP-0097)

2" Pulley (1/4" Groove, Single) (WCP-0358)

2" Pulley Slice (1/4" Groove, Double) (WCP-0359)

Optional Parts to Buy

There are unlimited possibilities with the WCP Polycord Pulleys. A common example can be seen below.

This is an example of a larger multi stack of the pulleys. This setup can be useful for a conveyor system inside a team’s robot to move or store game objects.

Assembly Prep

Refer back to the Individual Components page and ensure that all necessary parts are located before starting assembly steps.

Tools Required For Assembly

These tools are required for the assembly of the Polycord Pulley.

• T7 Torx Driver

Key Assembly Instructions

The pulleys can be assembled with or without the #2-28 screws. Shaft collars or snap rings may be used to constrain the slices. The screws are the recommended method as they will keep the slices together if they are removed from the shafting.

Step 1

Align the pin on the Single slice with the matching pocket on the Double slice. Install the desired amount of #2-28 screws to hold the pulley slices together. Be sure to tighten the screws fully. There should be no gap between the pulleys when they are assembled.

Step 2

Repeat the process from the previous step with a Double slice. This process can be repeated for as many Double slices as desired.

Step 3

After adding as many Double slices as desired, add the final Single slice to the outside. Install the final set of screws, if screws are to be used.

Manual Updates

Product Updates

Common Questions

Q: Do the screws come with pulley slices?

A: No the screws are not included in the slice kit as they are not required for assembly. The pulleys can be assembled with or without the screws. For a more secure assembly, the screws are recommended.