Hollow Clock 2 Remix

## Hollow Clock 2 Remix

This **Hollow Clock** is a remix of the [Hollow clock 2 - silent and smooth](https://www.thingiverse.com/thing:4761858) by [Shinsaku Hiura "shiura"](https://www.thingiverse.com/shiura/designs) and licensed under the same Creative Commons - Attribution - Non-Commercial - Share Alike license ([CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/).)

Ikea-style assembly instructions and the BOM (parts list) are [here](https://github.com/martinbudden/HollowClock/blob/main/HC160/readme.md)

## Improvements to original design

I was having problems with the clock keeping time, mainly due to two reasons:

1. The gears sometimes skipped
2. The Arduino itself does not keep particularly good time

To solve these problems I made the following changes:

1. Changed the gearing to use involute gears
2. Added an axel to the reduction gear
3. Added a housing to the main clock face
4. Used a mortice and tenon joint to connect the clock face to t