APPENDIX B ■ APPENDIX B
The set screw is tapped, installed, and tightened through a hole in the rim (see Figure B-15).
Alternatively, the center of the hub could extend far enough out to clear the rim; however this would
increase the total width of the wheel.
Treading Lightly
To create a tread, I designed a printed tool that rotates around the center of the hub to spread rubber evenly
around the rim (see Figure B-16). I applied white Sugru silicone rubber and then spread it with the tool.
Figure B-14. A D-shaped hole in the center of the wheel hub fits a D-shaped motor shaft
Figure B-15. Tapping set screw threads through a hole in the rim
Figure B-16. A 3D printed tool for evenly applying rubber to a hub