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Found 9 results

  1. Pentagon Clock This is a wind-up pendulum clock powered by two pullback motors. This clock is not true to real time but rather focuses on features such as a wind-up mechanism, pin wheel escapement and three concentric hands. It has been built completely in-system and can be reproduced without any fine-tuning, except for making all gears run smoothly of course (LXF-file here). The clock has a very consistent autonomy of 18 minutes. It features: A wind-up mechanism - A differential is used to prevent the hands from running counterclockwise when winding-up the clock. One of it's outputs is locked by default and slips during wind-up. Pin wheel escapement - Instead of using teeth, the escape wheel has three round pins that are stopped and released by a scissors-like anchor, which has been integrated in the pendulum. Three concentric hands - Planetary gears and a differential house make for a fictitious LEGO time system with 2 hours in a clock revolution, 5 minutes in an hour and 30 seconds in a minute. The pentagon-shaped clock face refers to the 5 minute hour. All features have been originally developed for this contest.
  2. I've built a few clocks with LEGO over a few years, but none of them have been practical to use. To be practical, it needs to run for at least 24 hours, and be really easy to rewind. Having to spend more than 10-20 seconds with a winding wheel is too much of a pain (and my last clock took way longer than that!). The main difference between this clock and my other clocks is the drive weight is on a chain, and the chain can be simply pulled back through the clock to rewind it (driving a ratchet instead of the drivetrain), solving the ease of rewinding problem. Some other details: The escapement is a Galileo escapement with a 40 tooth wheel The hands can be moved forward by hand to set the time via a differential ratchet The drive weight is ~600g (11 boat weights x 53g, plus the parts to hold it together), the chain is a loop connected to the bottom of the weight to balance the drive weight The ratio between the chain and the escapement is 416:1 (40:24, 2:1 differential, 40:8 x 3) The weight falls 2.59cm/hour, so with 3 feet of drop, the clock will run for about 35 hours (it's currently mounted a little over 5 feet off the floor, so it could be given enough chain to run for about 60 hours). It should be accurate to within a minute per 24 hours, but it will take some time to dial in the position of the bob on the pendulum The single thing that helps the most with efficiency is a knife edge suspension for the pendulum, I learned this technique (and probably other techniques too) from and Here's a video: And here's a slow motion video of the escapement: I hope you find it interesting! I wanted to share the chain drive technique because I haven't seen it before, and it really makes a LEGO clock a lot more fun and less of a pain in the butt than a string on a spool :)
  3. While the Department of Time generally ensures close watch of time for all citizens, some prefer having personal access to the hour of the day. Such access can be ensured by the use of a clock, but as a clock is a piece of fine machinery, it needs an expert hand to keep it running accurately. Recently, such an expert hand has arrived in King's Harbour and has set up a respectable establishment in the centre of the commercial district. On the ground floor, his wife handles the customers, both those who are looking to buy, and those who needs a mechanism serviced. And on the top floor, he services the clocks in peace and quiet in the well-lit room with his special tools and worktable. A small artisan for King's Harbour. It was fun building those clocks. C&C welcome:)
  4. This modular station was inspired by a long since expired Cuusso / Ideas project, (not mine), and set 2150 Train Station from 1996. I added a clock suspended above the platform and removable six track long platform. I even put a wheelchair access ramp from the street side for use by the wheelchair pieces LEGO recently made. Underneath the clock (which is itself inspired by item I saw on Brick-Link) is where the name of the station / town goes on 1 x 4 bricks with side studs. It can say anything you want, but "Ironwood Union Depot" is what I put there. The street side of the station has been extended towards the edge of the base-plate, allowing for a more room (and more details!) inside the building. The lower floor has the central ticket desk and two inside waiting rooms located under the two left and right wings. These wings also allow for access to the platform under the twin canopies. The second floor has the switching control room and station managers office which floats inside the exterior walls on some tile-topped pillars. This assembly is barely connected to the build by two studs. (NOTE: No stairs to the upper floor were made because that's how the official CITY sets are, so I didn't include any. Besides, it would have messed with symmetry of the station!) The modular station features two platform sections, two lower roof sections, one upper roof section, and the removable second floor on top of a cafe (with seating) on the lower level. The station platforms fit via Technic pins while the other sections attach via a few studs. EDIT 10/16/17: Added new pictures of the revised station. EDIT: 11/20/17: added revised photos in preparation for real life pictures come Christmas morning. EDIT 12/31/17: I just need two more letters and to cut up a 48 x 48 base-plate into 16 x 48 strips.... plus I need to build the platform on those strips. EDIT 1/5/17: it's finally DONE in real life! Comments, questions and complaints are always welcome!
  5. A compact, gravity powered clock. There are many Lego clocks around, but most of them are really huge contraptions, and for a good reason. They are easier to tune, more eficient, work longer... So naturally I took a challenge to make something small but still usefull :P. The key component is the pendulum. Typically, a significant length is needed to get period of one second. Here, a second mass over the pivot point slows the tiny pendulum down, so that it can be many times shorter than usual. The compact "knife edge" pendulum suspension dramatically reduces friction, decreasing the power necessary to run the piece. The low mass of components creates many problems. The clock is reasonably accurate (I got it within 5 seconds per hour), but tuning was a nightmare, and even a sneeze can alter its rate. The power source is 100g weight on a string. Due to only one hour working time, I have decided to use only minute hand. Seconds hand puts too much power demand on the mechanism. 1 by David_Z1, on Flickr 3 by David_Z1, on Flickr Schem2 by David_Z1, on Flickr Many thanks for KEvronista for inspiration to get into this Lego clockmaking hobby :) [EDIT]: embedded the video.
  6. [WIP] LEGO Clock

    Hello Eurobrickfans. This is my first Forum post, so please forgive any netiquette errors. I am attempting to build a functional clock in LEGO. Progress is posted on my blog at (among other things I'm building). Here is a short Youtube of current progress: Thanks Justin
  7. This is a fully automatic clock that was finished end of 2014. So, why do I call it "fully automatic"? - The clockwork runs as a normal mechanical clock with a pendulum and counterweight. - There is a motor that winds the clock every hour. - The speed of the clock is adjusted once a day using the Mindstorms unit. The speed is adjusted by changing the length of the pendulum. In total, the clock runs for itself without any assistance, and it shows the right time, even if it is build using only LEGO bricks. (Apart from the string to the counterweight) There have been many challenges in this design. My main focus, except the obvious goal to make everything to work, was to make this as compact as possible. The whole clockwork fits inside 14x14x14 studs. I did a short video to show the "action": The two sensors are used for: 1. Stop when the counterweight is fully winded 2. Give feedback from the minute hand rotation back to the Mindstorms unit. The counterweight is made out of 12 train/boat weights and is about 0.68kg. Winding is done through a differential to avoid interruptions during the winding. There are two medium motors inside the clockwork for the winding and adjustment. The Mindstorms unit is hidden in the base behind a hatch: WIP pictures Specially designed differential gear to reduce the friction between the counterweight and clockwork as much as possible. The winding motor rotates the large turntable gear: Clockwork prototype, without any automation: Very first prototype of the escapement:
  8. MOC: Gotham Anarchy

    Gotham Anarchy The Dark Knight infiltrates Gotham Clock Tower to take down Anarky; a criminal mastermind and terrorist who is planning to blow up the landmark. Gotham Hostage Gotham Anarchy Enjoy! ~Nemo
  9. MOC: B:TAS, The Clock King

    A creation based off of the episode “The Clock King” from Batman the Animated Series. I rather like the Clock King, and while his appearance in JLU Animated is cooler, he nonetheless is great in B:TAS too. I went for the gear look on this build like in the episode, and added in more clocks for looks. Unfortunately I had to change the “death torture” of Mayor Hill so I could include all three characters in the same scene. Anyways I’m glad with how it turned out. Enjoy ~Nemo