This is a 4in Traction Wheel designed for use in FIRST Robotics Competitions on robot drive systems. It is intended to be used in combination with a length of 1in wide traction tread material, just as you would with any standard traction wheel, such as those available from VexPro or Andymark, but at reduced weight. These wheels use the standard 1.875 in mounting hole pattern found on most FRC wheels. The axle hole can accommodate up to 2 standard 1.125" flanged bearings which mount flush to the surface of the wheel, or VexPro "VersaHubs". Tread can be attached with 8-32 screws and nuts using the included mounting holes (which also makes changing tread without removing the wheel from the robot easy).

DO NOT USE POP-RIVETS TO ATTACH TREAD TO THESE WHEELS!

These wheels have been proven to be durable for use at up to 3 district events (during the 2018 season) before any replacement is necessary. Depending on the application, you may see some degradation of the edge of the wheel rim where the tread sits between over time, this is normal and purely aesthetic. Wheels should be replaced if any damage is found in the areas of the wheel that directly support the tread or the mounting holes.

Total weight using eSUN PLA+ material: ~0.224lbs per wheel (wheel only, no tread or hardware included)

Robo 3D

R1 ABS + PLA Model

No

No

0.2mm

25%

Print with at least 5x outside/inside perimeters! While this will extent print time, it also greatly improves the durability of the wheel.

Triangle Infill pattern is preferred but not required.

No supports are required.

On my printer, I was able to run these parts at 75-85mm/s resulting in a print time of roughly 4.5 hours per wheel. Obviously though, your mileage may vary depending on your printer and slicer settings.

This model is based loosely off of the COTS traction wheels sold by AndyMark and VexPro. I designed this part as a lightweight alternative.