Pendulum Clock Accurate to 1/3 of a second.

myminifactory

Update: Here is a video of the escapement design working: https://youtu.be/Ydga0vu-fp0 You can find more renders of the clock here: https://drive.google.com/drive/folders/1DAHduDe4tw8l_9lHR7u_CifAMECHqd8H?usp=sharing This is a 3D printed clock, designed to print in one piece for SLS 3D Printers. It's specifically tailored for the Sinterit Lisa, fitting perfectly within its build volume and taking advantage of its high precision to make accurate many-toothed helical gears. Although I couldn't print it due to lack of access to an SLS 3D printer, I'm fairly certain it will work as I've used tolerances proven for moving parts on the Sinterit Lisa, and designed holes in denser sections for easy powder removal. I also know the gears will function correctly as I checked them with Autodesk Inventor's gear dialogue box. From a mechanical standpoint, it's based around a deadbeat escapement as described in Ward L. Goodrich's book "The Modern Clock," published in 1905. It's accurate to within a third of a second and uses gears with a 20-degree helical pitch, making the gear movement smoother than normal straight-tooth gears. Unlike similar wind-up clocks, the rate of this clock stays consistent throughout its entire wind time as gravity is a constant force, ensuring it will last longer than a traditional wind-up clock. It also has no parts under constant stress, reducing the likelihood of nylon material cracking. As designed to be 3D printed and easily customizable, I gave it an unconventional hand layout that I thought was unique, and a minimalist aesthetic to showcase the gears. The face is marked with the radius of the hands and shows where they overlap and start points. Finally, I utilized a clever design where the entire outside of the clock serves as the weight system, rotating accordingly by marking this feature. This allows for displaying longer periods of time. One final note: the only non-3D printed part in this clock is the M6 bolt used to provide mass to the weight system, which can be easily sourced from hardware stores if you're looking to make one yourself. This design is open-source as I've also uploaded the assembly files from Autodesk Inventor, allowing others to improve it. You can download that here: https://drive.google.com/file/d/0Bz865qShcs9qTDcwdnpWd05PM00/view?usp=sharing This project was inspired by reading "Longitude," a fantastic book about the clock that won the longitude prize. Remember to check the comments for up-to-date modifications of the design.