aeh5040 Posted January 24 Posted January 24 Hi all, This model was originally designed for the TC28 contest two years ago. (It now has a new name). I'm pleased to announce that I have at last fininshed streamlining and improving the construction to make it suitable for others to build. It should now be very robust and reliable. I have produced full instructions, including a user-friendly system to apply and adjust the labels (which are in a printable PDF file), available at Rebrickable here: https://rebrickable.com/mocs/MOC-247663/aeh5040/seven-hundred-year-reckoner/ The purpose of the device is to immediately find the day of the week for any date from 1 January 1601 to 31 December 2300 (Gregorian calendar). It does this entirely mechanically, and leap years are handled automatically. There are three differentials which mechanically combine the century, year, month and date inputs, and an automatic month selector for leap years. The original development thread is below.  Quote
2GodBDGlory Posted January 24 Posted January 24 Very cool build! The action sounds very satisfying, and it's great to see the high splat gear usage! Quote
MKJoshA Posted January 24 Posted January 24 This blows my mind. The Lego is amazing. But what really impresses me is your calculation of all the dates that share a day of the week. Quote
R0Sch Posted January 26 Posted January 26 Great job with the gearing on your calendar! Wonder why TLG didn't even release a simple clock in Technic. Quote
TeamThrifty Posted January 27 Posted January 27 On the robotic arm thread i questioned why TLG didn't produce one.... Same question for this excellent engineering example. Awesome. Perfect wake-up from the car-coma. I love to see a build that i can't understand - as the saying goes, if you're the smartest person in the room, you're in the wrong room - i love this moc. It begs to be used, the opposite of the shelf-megablocks-mentality. I'm a big fan! Quote
aeh5040 Posted January 27 Author Posted January 27 Thank you for the kind remarks! It is actually simpler than it looks, but a lot of effort went into making it robust and reliable, and also into making the instructions practical. I did contemplate trying Lego Ideas, but I don't think it's worth it. The chance of success seems tiny, and just submitting it there comes with downsides. Quote
aeh5040 Posted January 29 Author Posted January 29 (edited) On 1/24/2026 at 6:15 PM, 2GodBDGlory said: Very cool build! The action sounds very satisfying, and it's great to see the high splat gear usage! Thanks! The 14 teeth of the splats are very convenient for 1:7 ratios... Edited January 29 by aeh5040 Quote
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