Davidz90

Yes, this! My dream come true would be Bugatti type 35 or some other 20's-30's race car in the 1:8 supercar scale.

Thank you!

I have recycled the best elements of the clock tower into something more manageable in terms of size: The form resembles turret clocks commonly found inside the clock towers. The mechanism will rest at the top. Unlike the previous design, here I have plenty of space to add many extra functions such as chimes.

What a fantastic machine! Truly a breathtaking demonstration of mechanical computing.

Thank you very much! The fact that You find the book useful is all the payment I need, really :) Knowledge should be free, and my goal is to share the knowledge.

Absolutely love the old school Technic structure! Merry Christmas

Anyone else having invisible white text on white background on the Technic subforum? Same for me. Dark theme works, other subforums work.

Printed version is available! As promised, now in larger format. Some old chapters have been updated with better layout too, to make pictures bigger and clearer. However, larger format and more pages also means higher price, unfortunately - it doubled from $10 to $20. Initially, I also wanted to make a hardcover version with "premium quality" images, whatever exactly Amazon means by that, but that yielded $40 price tag, which feels unreasonable. Link to Amazon page is here: https://www.amazon.com/dp/B0G6YQPJ6W

Traditionally, Merry Christmas :)

The second edition of my book is here, with almost double the length! Link: https://drive.google.com/file/d/1u2hjSavIkEeW3qnAZkPk7qt0ar5UKe-d/view?usp=sharing The biggest additions are two new chapters about balance wheel escapements (like in wristwatches) and computer simulations. Physics section got expanded as well. I'm working on a printed version. I'm not fully satisfied with the book size and image quality, hopefully I'll manage to make the second edition slightly larger and nicer without inflating the price too much.

I had an opportunity to showcase my clocks at a science festival :) Few lessons learned: -A full-sized grandfather clock sure attracts attention, but kids couldn't really see the mechanical bits at the top -On the other hand, the most ornate parts of the clock tower are near the bottom, where most adults couldn't see them -The new tower is not as rugged as the green clock, it was constantly losing small bits and pieces; transporting it intact was also challenging (it only divides into three large sections) I already have some ideas how to address above issues; new project will start during winter break

Congratulations on a fantastic achievement! I'm really happy I could help, and that there are so many enthusiasts of this somewhat niche hobby The accuracy is truly astonishing - under a minute per week is up there with the best of the best. You have already beaten: -best mechanical wristwatches -average "real" grandfather clocks -cheapest quartz watches Fantastic! Next step would be thermal expansion compensation, but that would most likely need non-Lego parts. (however, you might check Kei Abe on youtube, he has built 100% Lego thermal compensation)

Very interesting! Great job recreating it. For the real thing, I have some doubts regarding the durability of the ratcheting mechanism in automotive applciations. Nevertheless, this is a really clever solution.

A few more photos. The tower is in the same scale as Notre Dame cathedral (approximately 1:300), making it 570 m high. That would be second tallest building in the world and most massive one by far. The lowest level has interior, visible through the main entrance The clock mechanism is on a "balcony" below the face. Two driving weights provide pwoer for about 80 hours on one rewind. General layout is basically two towers connected with bridges, creating a sturdy H-beam like structure. Near the top, there are two knobs for rewinding and setting the time. One can also see one of the two large diameter wheels that support the driving weight. Nylon string unwinds from the central, white spool and goes around these wheels. This way, each driving weight is supported by a single, large diameter wheel, reducing friction.

It's done. That was a lot of work.