Hollow Clock 2 Remix

thingiverse

## 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 the base 5. Recessed the gears to reduce friction 6. Used a Raspberry Pi Pico instead of an Arduino - this has a build in real time clock and so keeps much better time Items 3 and 4 stop the clock face from "jumping" and skipping a tooth. Additionally I changed the design of the base and cover, and the new cover can be printed without supports.