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43 votes

Is connecting LEGO studs on Technic pins legal?

The presentation that senior Lego designer Jamie Berard held at Brickcon 2006 and that spawned the entire legal vs illegal discussion can be found here: https://www.hellobricks.com/pdf/jamieberard-...
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31 votes
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How do the various LEGO springs compare?

Over the years the LEGO group has made a number of different springs, dampers and suspension components. The most widely known ones are the springs in the 731 series, such as the above mentioned ...
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31 votes

How can I get my motor to line up with a linear actuator?

The axle is misaligned by half a stud, so an obvious approach to this problem is offset your motor by half a stud. The technique of offsetting bricks by half a stud is known as AZMEP (from the german &...
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28 votes

Is it possible to build a working 100% LEGO glider with the Technic Catamaran sails?

As it turns out, the answer is yes! Even though the wings are flat and can't generate much lift, I was able to get up to about 15ft of distance on a 10ft drop. click to watch the video Here's how I ...
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26 votes

If I were to make a LEGO fan how would I make it blow air on me?

A fan is just 1/4 of a drone, right? Check out this lego drone that actually flies, for inspiration. https://youtu.be/wUVvQk7XLd4 The blade part in question is 89509
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24 votes

When did LEGO decide that it was okay to put a stud into a Technic hole?

1977 When Technic was first introduced. Check out this alternative build of set 850:
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  • 1,156
24 votes
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Realistic Lego car sets containing gearboxes and engines?

LEGO sets There are more than one set with such characteristics. While first four are from 20th century, I've included them anyway, since they are well-known and include characteristics you are ...
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  • 19.9k
23 votes
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Which old Technic set included large yellow motor?

I actually managed to find the exact set while refining the question. It's set 744, released in 1980. Here are the reasons why the research I did prior to writing the question didn't lead ...
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19 votes
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Is this a real Technic cloak?

this is a Playmobil cape, from the Zorro figure
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  • 11.1k
19 votes
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How can I make church bells with a pull cord?

It sounds like you're trying to implement a fairly simple bell mechanism such as this one: You can certainly do this using some string and the pulley element that you mentioned. I'd recommend tying ...
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  • 34.1k
19 votes

How can I place a motor in the middle of a Technic beam with an odd number of holes?

I'd address this with bevel gears:
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18 votes
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What tool can get the Technic pin out from a connection closed in the other end?

Push the Technic pin in a beam hole, then insert a rod (antenna or minifig tool handle) into the hole in the pin from the other side. The rod will prevent the "lips" of the pin from closing in, ...
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  • 13.8k
18 votes

Motorized speedboat from Technic Catamaran alternate model?

With a few Power Functions elements and a pair of propellers, I was able to build a motorized boat similar to the alternate model. 1x: 8881 Power Functions Battery Box 2x: 8883 Power Functions M-...
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18 votes
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How can I place a motor in the middle of a Technic beam with an odd number of holes?

Something like this would work. Since this is just an idea pictured assembly doesn't feature any bracing required for this solution to work properly. Another thing to mention - 8T gears doesn't like ...
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17 votes
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How can I motorize 42077 Technic Rally Car with LEGO Power Functions?

With some Power Functions elements and a few extra pieces, it's pretty easy to turn the Rally Car into an RC car. Here's a quick demo video of my design in action. And here are the instructions I ...
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17 votes

If I were to make a LEGO fan how would I make it blow air on me?

The easiest way to do this would be to use a motor with a high speed (or gear up a lower speed motor) and then attach one of the larger propeller elements to it. You can probably build a custom prop, ...
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  • 34.1k
16 votes
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How much current do the LEGO motors draw?

YES! Philippe Hurbain (Philo) has put together a great and very detailed write-up on those and many other LEGO 9V electric motors. You can find it here: LEGO 9V Technic Motors compared ...
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16 votes
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How do I take out this pin from an axle connector?

I usually attach it to a Technic beam, then put something to fill the hole so it can't squeeze together and come out, to give a handle. The flexible rods tend to be a nice options for filling the ...
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16 votes
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What part(s) can I use to connect technic liftarms with modules?

Put two plates between each layer of Technic bricks and the holes will align. This technique was used commonly in studded Technic sets. Here's a page from the instructions for 8042 where you can see ...
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15 votes
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How can I make a precise one-way clutch using Technic elements?

Would this solve your problem? Depending on the direction of the input, only one axle will turn.
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15 votes

LEGO 42095 wheels going opposite directions

I believe you forgot a critical step in the instructions, namely step 84: It shows how to position the black switches on the remote control, they reverse directions.
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15 votes
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Identify an unusual double-ended ball socket link part

That is 4 separate parts. They can be disassembled, but they are somewhat fragile. The ends are part 6644 Technic Flex Cable End - Ball Connection with Cage: The middle section is made up of a length ...
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13 votes
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What's the purpose of the clutch gear in Power Functions set?

When your function (such as an extending crane boom) gets to one limit or the other, this clutch gear ratchets instead of binding up the motor and all the gears in between. ETA: Forgot the second ...
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13 votes
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What is the "Module" of a LEGO gear?

Quick answer: LEGO gear module is 1 (metric). See Section 3.4 at this link: http://bdml.stanford.edu/Main/CrawlerNotes The consensus seems to be the following: Lego gears have a metric module of 1, ...
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13 votes
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Why do gray axles appear black and black axles appear white and black in this manual?

I don't have this set, but used 8421 as a test. This set is also released in 2005. Looking at the PDF you see the same color scheme of the axles, were the black appear to be gray and vice versa When ...
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13 votes
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What is the purpose of the 8 tooth timing gear?

When looking at Blakbird's Technicopedia page for this Technic set, this part is indeed used as a rotary encoder in combination with the bar code scanner. See the last entry on the page.
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12 votes
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What are good books for building techniques of LEGO Technic

In addition to Sariel's excellent book, I'd suggest Yoshihito Isogawa's "Tora no Maki" (Book of secrets) downloadable PDF book, and his Ideas books in print. All are full of clever ...
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  • 2,663
12 votes

Technic Pin/Travis Brick Legal Connection?

In general, this sort of connection is illegal, but I think that it works fine with a Travis brick. Technic pins must be "in click" in a model, or the pins will be held in compression and can be ...
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  • 34.1k
12 votes
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Pattern for oscillation with LEGO Technic

What you're looking for is reciprocal motion, or to convert rotation motion into linear motion (and then back to a limited rotation). Building out the key parts of the fan head you have the following ...
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12 votes
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Identifying Parts Used For The Escape Hatch of Sariel's Tiger XL Model

🎶 First three from what we can see...🎶 Part: 4735 Bar 1 x 3 with Clip and Stud Receptacle (Robot Arm). Part 2958 Technic, Disk 3 x 3. Part: 75c03 Hose, Rigid 3mm D. 3L / 2.4cm. 🎶Last two ...
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