AndyMark  4 in. BB Mecanum Wheels

The 4 in. BB Mecanum Wheel is a lightweight, slim wheel. BB stands for Ball Bearing, referring to the bearings inside of each roller that make for incredibly smooth motion. This wheel was optimized for an FTC Chassis, such as the MecanAM Chassis. These wheels ship as an unassembled kit.
 

A full set consists of 2 “right” wheels and 2 “left” wheels. The “right” and “left” refer to the direction the rollers are pointing when viewing the wheel as if you’re about to get run over by the wheel itself. If the roller in the middle of the wheel points up and to the right, it’s a “right” wheel, and up and to the left would be a “left” wheel.

The configuration of these “right” and “left” wheels is important to a mecanum drive system! Be aware that the “right” wheel should not mean that it goes on the right side of your robot. The proper configuration would be to have the wheels create an “X” pattern when viewing your robot from above and drawing lines parallel to the rollers as viewed.

This means that a “right” wheel would be the FRONT RIGHT, and the REAR LEFT position, while the “left” wheel would be in the FRONT LEFT, and REAR RIGHT, of your robot when viewed from above. All 4 wheels are required to make a Mecanum drive holonomic system work properly.

Wheel Bores:

• Nub Bore
  • Perfect for FTC robots
  • Compatible with Nubs as an attachment point to shafts and motors
  • A 6-32 screw is perfect for attaching to a Nub:
    • (am-1567) 1.5″ for a standard HD Nub or Servo Nub
    • (am-1568) 1.5″-1.75″ for an XL HD Nub
• 1/2 in. Hex and 3/8 in. Hex Bore
  • Bore molded directly into polycarbonate center body
  • BE AWARE: these have a limited torque capacity. Recommended use in light duty applications (FTC robots or non-drive train FRC items such as an intake)

Roller and Axle Design:

The black TPU rubber roller has a durometer rating of 60A. The roller has a Polycarbonate core, and rides on a stationary brass tube.

Wheel Structure:

12 rubber rollers are sandwiched between 2 steel plates. The two plates are held together by bolting the rollers in place.

These wheels can be purchased individually as Left or Right wheels.

Individual Hardware within Each Wheel:

• 2 – BB Mecanum Plates
• 1 – Hub
• 12 – Individual 4 in. Wheel Rollers
• 24 – Axle Bearings
• 12 – Brass Inner Sleeves
• 12 – M3 x 0.5 in Nylock Nuts
• 12 – M3 x 0.5 45 mm SHCS Screws

Usage:

• Nub Bore Wheels
  • For FTC Robots: If attached to a shaft or NeveRest motor, these parts are needed for each wheel.
  • Attach an AndyMark Nub or Tetrix Motor Hub directly to the Nub Bore version of this wheel.
    • Four 1.5 in long 6-32 screws such as am-1567 are required per wheel for this method.
• 1/2 in. Hex Bore : Direct Drive
  • Simple! with a 1/2 in. hex shaft
• 3/8 in. Hex Bore : Direct Drive
  • Simple! with a 3/8 in. hex shaft