Inspired by the phone case from https://www.shapeways.com/product/DCUKUC292/rotary-phone-case-for-iphone-5-5s
which is really cool, being printed as one piece. However SLS printing can get quite expensive, so I designed one to snap together from multiple parts, all having a large flat base for easy printing on a desktop FDM machine.
The design has a spiral spring and slotted disk designed for a rotary encoder at the back, so it can be interfaced with and arduino.
(I will make a video of it being dialed and interfacing with arduino shortly)
Fusion 360 file included. It contains some equations to help me set the spring outer diameter, since fusion only accepts pitch and inner diam as arguments when generating spirals. All the favorited parameters are user inputs.
If you don't know about parameters in fusion, they are really useful https://hackaday.com/2016/02/02/making-parametric-models-in-fusion-360/
In the 4th image you can see the 4 iterations of the design I went through before I got it right
| backplate.stl | 39.8KB | |
| bolt.stl | 18.8KB | |
| dial.stl | 210.4KB | |
| encoder.stl | 105.9KB | |
| spring.stl | 401.3KB | |
| spring_dial_v45.f3d | 2.0MB | |
| stop_pin.stl | 95.1KB |
