Interested in building techniques? Then this is the tag for you.

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How can I build a Lego rubik's cube?

How can I build a LEGO Rubik's cube, I have 2 of them, and I've built them several times, but how can I build a LEGO Rubik's cube.
8
votes
1answer
473 views

Alternative for Technic, Gear Rack 1 x 7 with Axle and Pin Holes?

We are trying to build a MOC which requires Technic, Gear Rack 1 x 7 with Axle and Pin Holes and we don't have that. Could we build it? Or are there any alternatives? FYI we do have Technic Gear ...
8
votes
2answers
443 views

Parts in Lego Set

I am building an inventory of all my Lego pieces and I am looking for a website that can give the pieces in a set with only the set number. It would be easier if there was information for many Lego ...
8
votes
2answers
1k views

What are some helpful techniques for applying stickers?

It can be tricky to place small stickers accurately on small parts using adult-sized hands. The best technique I've found so far is to remove the sticker and stick it on the corner of the sticker ...
8
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3answers
908 views

Can you build accurate models using 100% LEGO elements by following Megablocks instructions?

I shudder when I find errant MegaBloks in my LEGO elements, but admit to admiring certain in-the-box models offered by them. I know the pictures depicted on the MB boxes are not actually photos of a ...
7
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2answers
597 views

What part(s) can I use to connect technic liftarms at a 90 degree angle?

Is there a way to connect the two beams in this angle and still keep the connection strong and keep the rotation the same?
7
votes
2answers
2k views

Is there a good way to build a dome on the top of a building?

How can I build a dome on top of a building, similar to a state capital or something similar? The building has a base of 16x24 studs.
7
votes
3answers
1k views

What techniques can be used for laying plates at 45° angle?

I've seen a number of techniques for laying individual elements at 45° angles, but I need a consistent method for laying down larger plates at 45 degrees while maintaining close contact with the base ...
7
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3answers
429 views

What are some creative uses of the orange brick seperator tool?

I have these piling up around my lego corner: Any suggestions for creative uses? Especially multiple?
7
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1answer
131 views

What part(s) can I use to connect modules at a 90 degree angle?

I'm looking for brainstorming! All ideas welcome. I have a design I'm working on which: is made of a bunch of identical modules fitting into a single framework has to allow the modules to "plug in" ...
7
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2answers
565 views

How can I make a Lego heroica scale gladiator arena?

Sorry all my questions are about heroica, but this needs to be easy so that I can build in a few mins. I will make gladiator micro figures as well, if someone can make a Lion too!
7
votes
1answer
139 views

Preparations for outside display

I am thinking of using LEGO to make some outside yard art, (large minifig scale castle) and wondered what I should do to prepare them for being outside in variable weather conditions (in the Seattle ...
7
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1answer
428 views

Building a 45 degree brace

I'm trying to reproduce my own house in Lego, and attached is a photo of the porch above my front door that is supported by a 45 degree wooden brace: At my current scale, the vertical white wood ...
7
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2answers
593 views

How is this brick attached to the pregnant minifig?

While Google-image-searching pregnant minifigs (don't ask) I came across this fig, and other variations on it, but I can't figure out how the 2x2 round brick is attached.
6
votes
4answers
901 views

What LEGO wheels would look like the three types used on the JPL Mars Rovers?

I would like to build the three types of JPL Mars rovers (Sojourner, MER and MSL) with the right size ratio relative to each other. For that, finding the right wheels would be the hardest thing. I ...
6
votes
8answers
28k views

lego ideas (with traditional bricks)

I would like to find a large catalog of Lego designs/ideas that can be built with "traditional" lego bricks (both normal and duplo). I have found many nice designs in the web, but most of them ...
6
votes
2answers
7k views

Alternative builds with Star Wars LEGO sets

I currently own these LEGO Star Wars sets: LEGO Star Wars X-Wing Starfighter 9493 LEGO Star Wars Millennium Falcon 7965 LEGO Star Wars Tie Fighter 9492 LEGO Star Wars Emperor Palpatine's Shuttle (...
6
votes
2answers
530 views

Firmly connect bricks in a triangle

I need to connect two bricks onto a plate such that the plate is facing up, and the two bricks are facing out from above it at an angle (say 30 degrees) but are connected firmly, at opposite ends with ...
6
votes
2answers
228 views

City scale connection for five-bladed helicopter rotors

I want to build a Super-Puma helicopter in city minifigure scale and form, I have the basic design planned, but I am not familiar with any five-sided technic connectors, which I will need for the ...
6
votes
3answers
287 views

What is the official term used for building MOC models?

I know that MOC means "my own creation" as noted here. What I would like to know is do you call the actual act of creating a MOC, "MOC building", or is there another official term? I wanted to build ...
6
votes
2answers
158 views

Cutting a Lego baseplate

I have a regular Lego baseplate that I'd like to shave down to fit into a car travel kit. Does anyone have experiencing cutting a baseplate? I'd love tips on tools or technique!
6
votes
3answers
3k views

Are BanBao bricks compatible with Lego?

Does anyone has experience with BanBao bricks? BanBao World Are they compatible with Lego bricks? They have basic sets and plates which are at a good price.
6
votes
2answers
478 views

Any way to create a gear+chain, like for a bike?

I would like to create a LEGO bike. I can imagine how most of it would work, but i'm stuck at the chain. I need a way for the turning pedals (at one spot) to cause the wheel (in the back) to spin ...
6
votes
1answer
870 views

How can I make a precise one-way clutch using Technic elements?

I need a mechanism so that if a (NXT) motor rotates forward, it moves one gear, but the other stays still, but if it rotates backward, the first gear does not move, but the second one does. I found ...
6
votes
1answer
345 views

How should I model a Heroica Banquet hall?

My son had a great idea for his Heroica game: Convert one of the desks from the Fortraan set into a table with food, and then your Hero could stop there and eat to regain health. I pointed out that ...
6
votes
1answer
193 views

Is it possible to create your own wheel?

After my other question, i pretty much have a bicycle design all planned. My problem now is with wheels. None of my LEGO wheels are big enough to work on a bike. And, the biggest ones are all pretty ...
6
votes
1answer
432 views

Is there a documented process in 'Jamming' an NXT Ultrasonic sensor?

Just trying to gather a bit of information for a competition between a few other NXT builds, I was wondering if there was a way to make the ultrasonic sensor completely useless for the competition as ...
6
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1answer
450 views

How should I connect two LEGO cylinders with pistons to measure the movement caused by sea waves?

As part of a school project I need to make a model of a snake electricity generator. I would like to build this with LEGO elements, and for that, I need to measure the movements of the cylinders ...
5
votes
6answers
8k views

Lego remote controlled cargo train not working

I've helped my son put together the Cargo Train set (60052) but now we can't get the remote control to work. It all looks like it's been assembled correctly with new batteries put in, but it doesn't ...
5
votes
2answers
217 views

What is the purpose of the Technic Axle 6 in set 6847?

In set 6847 (Space Dozer, http://www.peeron.com/inv/sets/6847-1) there is a black Technic Axle 6 that has no structural or cosmetic function in the set. I don't have the original instructions or box, ...
5
votes
3answers
372 views

Strongest LEGO structuce - (1) Pillars

What is the strongest LEGO structure? I am going to build a LEGO computer case. Different from Mike Schropp and greenyouse, I am planing to build an upright case. (This is a general "strongest LEGO ...
5
votes
2answers
569 views

Help identifying Lego Set from bags!

I visited Toyrus in Paris recently and bought several lego sets for my son. Mostly, Star Wars sets. In each case, we brought the manuals and the cardboard boxes so that he could assemble them. ...
5
votes
1answer
653 views

How to build a car that stops at a certain distance?

I want to build a small car that is about 200 grams. I want it to run the following course and stop at exactly or about the the finish line. I can't use any controlling devices or electronics. I've ...
5
votes
2answers
969 views

How many ways can six 8-peg lego blocks of six different colors be combined?

I have seen the number quoted as > 650 billion. The quote is from a Danish mathematician, Soren Ehlers. Intuitively, this does not seem correct to me. Any mathematicians/statisticians out there who ...
5
votes
1answer
258 views

How can the “Bar Holder with Clip” part be used?

I'm wondering whether the "bar holder" end of this element (http://www.bricklink.com/catalogItem.asp?P=11090) can be used as a stud. In other words, would it have enough clutch power to hold e.g. a ...
5
votes
1answer
859 views

How to build a limited slip differential?

Lego provides a couple of ways for building a differential, such as this: and also provides a limited-slip gear like this: http://www.brickowl.com/catalog/lego-technic-differential-with-one-gear-...
5
votes
3answers
686 views

Which type of LEGO bricks would be compatible with the Mega Bloks Blind Bag Figures?

My husband collects the Marvel figures which come in the Mega Bloks blind bags. His birthday is coming up and I'd like to build him a display for his Marvel figures. I'd strongly prefer to use LEGO in ...
5
votes
1answer
292 views

Access hatch in a wall?

Working on a 10 stud by 10 stud Square bell tower for my annual project. Need to create a access panel/door. Any tricks that can be done so it's hidden or at least not easily noticed? I need to hide ...
5
votes
1answer
434 views

How can I make a LEGO heroica scale fountain of youth using bricks from Fortaan or Waldurk?

I have started collecting heroica and I thought "wouldn't a fountain of youth be superb!" but I only have Fortaan and Waldurk... any ideas?
5
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2answers
151 views

Lego Motor for cycling a tool

I am curios to know if I can utilise the Lego Power range to rotate a transducer to a set point and return to its original position and if so is it able to cycle the movements repetitively? Ideally I ...
5
votes
1answer
179 views

Need help fudging a group in 8039

So, I'm building "8039 Venator-class Republic Attack Cruiser ™ Star Wars TM" and I've hit a snag. I need help fudging the instruction from page 76 of book 1 for that set (see picture below). I'm ...
5
votes
1answer
195 views

Measurements (LDU) of Lego tracks Set 151

I have an old set of 7851 curved tracks. I want to use the outer tracks (the ones with the bumpy surface). If I was to put one end down on a baseboard so that is tangent/parallel with the grid of ...
5
votes
1answer
1k views

What different bricks exist with studs on the sides? [closed]

(Partially inspired by this question.) I have been wondering recently just how many different LEGO bricks there are with studs on the side. Which LEGO bricks have studs specifically on the sides? ...
5
votes
2answers
452 views

Does anyone make a self-driving car?

Mapping and localization are the hottest trends in robotics today. And what's more exciting is they can be both implemented with a low-cost robotics kit like LEGO Mindstorms! I tried to make a self-...
5
votes
1answer
964 views

Best sensor for balancing inverted pendulum

I want to build a balancer for an inverted pendulum. Which of the following sensors is best suited for detecting the tilt? Accelerometer Gyroscope Angle sensor
5
votes
1answer
271 views

My building is developing gaps and spaces

I am building a large project, and there are spaces developing between bricks and plates. I've been working on it for almost a year, and some places are 20+ bricks high. What can cause this over time? ...
4
votes
2answers
430 views

What is the best way to rebuild Lego sets?

My six year old son loves to build with LEGO bricks and has quite a few LEGO sets. Over time they have been disassembled, so we decided to try to rebuild some of them. We have the original ...
4
votes
1answer
190 views

How do you eliminate the gap between castle doors?

I'm building a MOC castle and want to use a pair of 1x5x7 and 1/2 stockade doors. My problem: I can't get the doors to fit flush. Either there's a 1/8 to 1/4 inch gap between them, or they overlap. ...
4
votes
3answers
521 views

Does knolling help or is it just part of the fun?

When building a new set, many people knoll their LEGO bricks before beginning the assembly. My question is: Is there a actual advantage to knolling all the pieces or is it only a way to stretch the ...
4
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2answers
2k views

What is the quality of lego replicas on Aliexpress?

Aliexpress is full of lego replicas, does anyone bought them, and can say something about it's build quality? Example products: http://bit.ly/1Ls3jsg I'm sure it shouldn't be stored together with ...