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Step 3Wheel
The big wheel is the most obvious feature of this project, so you may want to spend some time getting it just right.
Again, a lathe really helps here, getting everything perfectly central and giving a nice finely grooved surface. I decided to go for a set of concentric grooves, intended to be for aesthetic purposes, but they do feel like natural finger grooves when turning the wheel.
To fit the wheel onto the shaft, drill out a hole a little smaller than the shaft, and gradually narrow down the shaft until it fits tightly. Keep a slight taper on the shaft so it can be hammered in to be secured. Threading would be a more elegant solution to this little problem.
Now is the time to align the rotary encoder with the shaft to ensure the wheel is level. I did this using blue tac to hold the rotary encoder in place, assembling everything and then moving it around by hand to get it in the right place. Then taking it all apart and gluing the encoder securely in place.
Again, a lathe really helps here, getting everything perfectly central and giving a nice finely grooved surface. I decided to go for a set of concentric grooves, intended to be for aesthetic purposes, but they do feel like natural finger grooves when turning the wheel.
To fit the wheel onto the shaft, drill out a hole a little smaller than the shaft, and gradually narrow down the shaft until it fits tightly. Keep a slight taper on the shaft so it can be hammered in to be secured. Threading would be a more elegant solution to this little problem.
Now is the time to align the rotary encoder with the shaft to ensure the wheel is level. I did this using blue tac to hold the rotary encoder in place, assembling everything and then moving it around by hand to get it in the right place. Then taking it all apart and gluing the encoder securely in place.
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