Robot MarketPlace - FingerTech Mecanum Wheels (Set of 4)

This product has been discontinued. Please see this similar product instead.

Use the Mecanum Wheels to add omni-directional capabilities to your robot.

Competition Grade set includes upgraded aluminum mounts and threaded pins with screws to hold the rollers on. No gluing is required. Loctite on the screws will ensure that a roller will not fall off during a competition.

What can they do?
The four mecanum wheels are each connected to a motor for independent control. The robot can move forward, reverse and spin just like four regular wheels. The configuration of rollers at 45Ą also allows the robot to translate sideways and through a combination of these, in any direction (even while spinning!).

How do they work?
Adjacent corners use mirrored hubs so that the wheels freely roll outward from the center of the robot. This splits the force into two vectors, one forward/backward and one right/left. When the wheels on one side are spun in opposite directions, the forward and backward vectors cancel out while both sideways vectors add up. Doing the reverse with the other two wheels results in four added sideways vectors.

How do I drive?
Control can be accomplished with a microcontroller or simply using an R/C transmitter! When both sticks are pushed in any direction, the robot moves in that direction. Pushing the sticks towards or away from each other makes the robot spin in place. The easiest way to think of it is that the left stick controls the front two wheels in any direction, and the right stick controls the rear two wheels in any direction. To achieve this control, two V-Tail mixers are required. One mixes the front two wheels to the left stick to respond just like a two-wheel-drive robot. The second mixes the rear two wheels to the right stick in the opposite fashion.

Specs:
Mecanum Hub material: Black Acetal (Delrin)
Roller material: EPDM 50-60D(A) Rubber
Outside wheel diameter: 2.125"
Wheel width at widest point: 1.25"
Bore of mount: 3mm (can be drilled to any size up to 1/4")
Weight: 52grams (1.83oz) per wheel
Capacity: 0.5-13kg (1-30lb) robot

Load Specs:
Testing a 1.36kg (3lb) Mecanum robot pushing against another unpowered robot equipped with Lite Flite wheels:
Pushing Forward, the Mecanum robot easily moves 66% of its own weight and can slowly push 100%
Pushing Sideways, the Mecanum robot can easily move 33% of its own weight and can slowly push 66%

Kit includes:
One 0.050" hex wrench and one 1/16" hex wrench
Instructions
Four Mecanum wheels (two A-style, two B-style), each with:
-Six threaded brass pins, twelve pre-drilled rubber rollers, twelve 2-56 screws
-One delrin hub, one aluminum mount, four 4-40 screws, one 6-32 setscrew