TechnicBrickPower

Hi Sariel, Wow that drummer is awesome. 10x better than my crane LOL. I might use some of these ideas! Thanks so much, Hi suffocation,.. now that's vintage lego technic. Interesting to see this idea has been around for a long time. Thanks for sharing this link - appreciate it.

Here I present a programmable controller to control two independent functions simultaneously. The controller uses two tank tracks with pins on them to select between neutral, forward and reverse to control a small crane. The timing of the switching can be controlled by the placement of the pins on each track in effect allowing you to program the timing sequence. The example crane can follow any sequence such as hook up, rotate clockwise, hook down, hook up, rotate anti-clockwise etc. The tracks have 40 segments each to allow up to 40 different timing options, however these can be extended as required.

Hi, Here are the instructions for the motorized trammel of Archimedes MOC I did a while ago. Thanks to 1963Maniac for creating them. https://rebrickable.com/mocs/MOC-41121/TechnicBrickPower/trammel-of-archimedes-do-nothing-machine-motorized/#comments This is the video explaining it:

I would hope so

Hi Everyone. Here I show a build I did a few days ago. It's an unconventional Lego Technic MOC timer gadget. It's based on 4 pins holding back a liftarm that stops the timer. Each pin is motor driven by a different gearing ratio such that the liftarm can only move once all pins align. This only happens when the number of turns of the main axle equals the LCM (lowest common multiple) of the pin gearing ratios. At that point the timer is turned off by a lever controlling a remote controlled unit. Unfortunately it didn't work completely as expected but that's what happens sometimes.

Hi all, a while ago I posted about my 63 speed gearbox MOC using 6 switches and some people here asked for build instructions. These are now available on Rebrickable for those interested https://rebrickable.com/mocs/MOC-40533/TechnicBrickPower/63-speed-gearbox-including-reverse/ youtube:

Hi Jurss, Good point, thanks. Creating one gear selector for 256 gears would be an interesting challenge... For me the point is having fun and trying out my ideas - I find that often ideas that initially don't seem to have much use come in handy when you're trying to solve another unrelated design problem. Hi Erik, Good question, you had me worried for a moment . Maybe it wasn't clear in the video but S0 and S1 are combined into a single 4 way switch. As well as S2 and S3, so the fact that S1 and S3 have the same ratio doesn't matter. S0 switches between 2/1 and 1/3 and S1 switches between 1/4 and 5/3 so that means you can make the following four ratios [2/1 x 1/4, 2/1 x 5/3, 1/3 x 1/4, 1/3 x 5/3] = [1/2, 10/3, 1/12, 5/9]. Similarly S2 and S3 make [5/9, 1/12, 5/6, 1/8], and even though these two have common ratios (i.e. 1/12 and 5/9) they are used on different branches of the two differentials. If you study the output over input (O / I) equations you will see these do not cancel out. The same holds for S2 and S6. So yes I am 99% sure that the 256 ratios are all different.

Here I present a 256 speed gearbox controlled by 8 switches. This design is based on a 2 differential N to P gear ratio design presented in one of my other videos. The gearbox allows 256 different gearing ratios to be selected.

Hey Morten - No it's a different version, but yes of the same topic - in this one I explain some of the underlying mathematics. Would love some tips on video editing - do you know of any tutorials?

Here I demonstrate a "Do Nothing Machine" also knows as a Trammel of Archimedes. Although it is known as a do nothing machine you can in fact use it to draw an ellipse! In the second half of the video the mathematics are shown to prove the elliptical shape that can be drawn. https://youtu.be/fusHdCxWgE8

Thanks glad you liked it! It's not completely useless - you can use it to draw an ellipse!

Thanks for that. I have edited the post.

Here I show my motorized "Do Nothing Machine" or Archimedes trammel in a funny way. https://youtu.be/fusHdCxWgE8

Hi Jurss, LOL I thought the same when I was making the video - getting close to that word. There's no F on the first reel so that wasn't going to happen by accident.

Here I present my Lego Technic MOC combination lock safe. It has four 8 letter word reels and can make 4096 combinations, 522 of which are actual English words - including the word "lego"! You can change the combination lock code using adjustable liftable gears hidden under a double bottom floor of the safe area.

I'd like to see any machine do that let alone a Lego one! You'd be close to going faster than the speed of light which is about 3e8 m/s. So if for example the bottom axle had a 1 lego unit piece on it (8mm) then for every revolution the outside edge will travel at the distance 8mm x 2 x pi which is about 0.05 m. So you'd need to spin the top axle at only 6 revs/sec (360 RPM) to get 6 x 1,000,000,000 x 0.05 = 3e8 m/s == SPEED OF LIGHT! Let's start that project.

About 222 days. However the whole thing will probably be broken by then LOL. Yes good idea - but you have to promise to watch all of it!

This Lego Technic MOC has over a billion to 1 gearing ratio. It is designed to resemble an architectural tower structure. I measured the input speed of over 3000 RPM using a digital tachometer and calculate the rate of rotation of the tower top to be about 222 days per rotation. This design has no purpose what so ever other than to look good and make a lot of noise. This idea was suggested and inspired by one of the eurobricks contributors.

Hi There. Thanks for your idea! Yes making useless things is my speciality!! LOL My videos are more about sharing techniques for designing certain gearing ratios. You'd be surprised where that could come in handy. That billion to one gearing system is really interesting. Did the guy 3d print those? Yes thank you will add that idea to my list.

Thanks Team Thrifty. Always nice to get good feedback. I am currently working on a 256 speed gearbox that includes pi (well 355/113 anyway)! LOL Do you have ideas I can work on?

Today is PI DAY! A very important day for all mathematicians to celebrate. What better way to celebrate than combining it with Lego Technic?! Here I present a PI Day special Lego Technic MOC that produces a gearing ratio of PI to 6 decimal places. This is using two differentials to produce a gearing ratio of 355 to 113. Happy PI Day.

Thanks @KevinMD - just looked them up - interesting part. It's amazing how many parts Lego has made that I've never come across.

Love those pods! Can I use that idea? Are actually lego pieces? Never seen them before. Surely it could be useful for an adjustable spirograph? That's another topic I'd like to explore.

Hi guys, thanks for the compliments. My background is software and electrical engineering so yeah my ideas are inspired by binary, programming & circuits. Yeah am working with someone to make one available. The design is actually modular - you can repeat the middle unit to expand the design to any number of binary digits (may not work in practice - only theory!!). If anyone else is interested in the build instructions let me know. Haven't tried loading it much but that shouldn't affect the gear ratio long term - however initially it may as the gears can have some delay in them.

I have made my first gearbox using differentials. It's a 63 speed gear box using 6 selectors. The gearbox implements all gear ratios from -32:1 to 31:1 using five differentials.