I developed these hubs as a solution to recurring problems with the wheels coming off my 12lb Robot "Surgical Strike".
They are designed an easy solution to the problem of
mounting a 3", 4" or 5" x 7/8" Colson wheel onto a standard cordless drill motor and gearbox. These wheels can be obtained from the
A 1" hex flange performs two functions. Firstly it stops the wheel sliding inwards off the hub. The second
function is to allow the use of a 1" wrench to help remove the hubs from the gearbox axle.
The straight knurl on the surface of the hub prevents the wheel spinning on the hub. The hubs we used before had plain
surfaces and the wheels would loosen up over time.
Finally a large custom washer is used together with the usual left hand thread screws that come with the drills. This prevents the wheel sliding outwards off the hub.
Servo Magazine article about how to make them
if you were so inclined.
Drawing of the hub
Drawing of the washer
3D IGS file of the hub.
3D IGS file of the washer
We recommend the use of an anti-seize grease on the thread of the motor
and Loctite thread locking compound on the securing screw.