![]() ![]() Hello in the meantime thanks for your availability and for having appreciated the 3d print. Thank you for following my instructables! :DĪnd Thank you for the Grand prize in the Clocks speed challenge 2021! The speed rate of the motor must be calculated with the real gear ratio for the earth to achieve 360°/24h (solar day), The gear ratio isn’t perfect, so I coded the Arduino according to the day’s rotation, In theory, 365.25 rotations of the Earth should induce one full rotation of the year carrier, but using this gear ratio, the year carrier will achieve 99.77% of this rotation (It has an error of around 20h/year which I find acceptable for a 3D printed model). I found a gear combination giving 7.1666:1 which is: ![]() To keep the gearbox small enough, I divided this ratio into three identical planetary gear sets with an aimed ratio of 7.1612:1 for each one. The real difficulty of the design was to find a gear combination linking the day rotation and the year rotation and to keep it compact.īecause the Earth’s axis is attached to the piece turning at 1rev/year and by knowing the ways of motions of the Earth, I had to achieve a 367.25:1 ratio. This step is here just if you are curious to know how I designed it and where the values are coming from ( you don't need to understand this step to successfully make your own Earth Clock) The piece Night_globe has a sacrificial layer improving bed adhesion, it needs to be removed after printing. Here is a table showing how I printed the pieces, no supports needed, nozzle = 0.4mm. Try to avoid the elephant's foot problem, it happens when the first layer is squished against the build plate, it is annoying when printing pieces intended to be put together, particularly when printing gears… so, despite the fact that the bottom surface remains ugly, I used rafts to print the 6 planetary_gear.Įlephant's foot can be reduced by lowering the build plate or its temperature, if it happens anyway, it can be fixed by scratching the surface with a blade. Here you can purchase the files on Cults3D a “tilted” axis doing 1 rotation every day, causing days and nights. a “vertical” axis doing one full rotation in 1 year, simulating the movement around the sun, causing seasons and changes in the days length. In the following timelapse the the speed is incredibly high, but keep in mind that the Earth's rotation is so slow that the model appears to be motionless!Īs the Earth is tilted by 23.4°, it turns on two different axes at different speed rates: ![]() The clock would be far too big! Because I didn't want to make something out of scale, I decided not to include the Moon. It can be called a "Tellurion" but without the moon, indeed, at this scale the moon is a 13.6mm ball, 1.5 meters away from the Earth. It's a little gadget to put on your desk. This is an unusual clock, it doesn't indicate time as a normal clock would, instead, it shows where your location is, compared to the night. The Earth Clock: I was happy with the result, however I am now an engineering student and I wanted to put my mechanical knowledge into practice, especially about 3D printing by designing a new version. 1.Few years ago, I invented and built a clock showing how the Earth is exposed to the sun in real time. P.S.: If you are a ticking clock hater, there’s a Facebook group for you called “I HATE hearing a clock tick when I’m trying to sleep”. In the pictures below you’ll find cool clocks made from unexpected materials, decorative wall clocks fit for even the most modern interior and everything in between. We have compiled a list of the unique wall clocks there are, that even the most snobbish time-watcher would find aesthetically pleasing. Skipping forward a thousand years or so more, the clocks have found their ways into everybody’s homes, and now we couldn’t imagine the concept of ‘living without time.’ As with everything that we use in our everyday lives, the aesthetic appearance of things is a desirable bonus, so a cool wall clock is a must.Įnter Bored Panda. He called it ‘Water Driven Spherical Birds-Eye-View Map of the Heavens.’ Pretty cool, I-Hsing, pretty cool. Anyways, let’s leave the existential questioning behind and skip forward a couple of hundred years to the invention of the first mechanical wall clock in 723 A.D by a Chinese monk and mathematician I-Hsing. ![]()
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