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Questions tagged [building]

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

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2 votes
1 answer
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70728/2 Ninjago piece too short?

My son is putting together the 70728 set and the grey tall pieces in book two at step 8 seem to be too short, they leave a gap. By about a mm. Has anyone else had this experience?
Jen's user avatar
  • 21
8 votes
6 answers
44k 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 ...
Jj24's user avatar
  • 81
11 votes
4 answers
897 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 ...
Windfire's user avatar
  • 2,028
3 votes
1 answer
325 views

How to connect chain links to the axle

In my project I want append two 21 chain links to the axle 12. Is this any axle connector with knob ending?
Kokosko's user avatar
  • 33
7 votes
1 answer
649 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 ...
Scimonster's user avatar
5 votes
2 answers
4k 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 ...
Bonifer's user avatar
  • 51
6 votes
2 answers
839 views

Gearing down a PF XL

I'm looking for the best way to gear down a Power Function XL. I need to achieve a very slow output RPM (less than 1-2 RPM). I've tried a 625:1 gear (trough 40:8 gear). Can someone link to a well ...
Imlach's user avatar
  • 61
8 votes
2 answers
1k 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 ...
Scimonster's user avatar
15 votes
3 answers
1k views

Brick-built alternative to "Door 2 x 5 x 5 Swivel, Bracket Base"

I am trying to make a brick-built alternative to the swivelling door piece that's frequently used to provide secret entrances in castle sets. Example: this combination (images from Bricklink) The ...
Mr. Shiny and New 安宇's user avatar
3 votes
2 answers
181 views

Resources to learn useful common Mindstorms mechanical construction patterns

I'm currently working on building a small scale CNC-like (X-Z, no Y axis) machine to cut glass mosaic tiles. I decided to give it a go using my EV3 set and I'm having some trouble with the Z-axis ...
maasg's user avatar
  • 131
5 votes
2 answers
228 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 ...
Mark Poole's user avatar
9 votes
1 answer
475 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 ...
Josh King's user avatar
  • 1,911
14 votes
4 answers
675 views

Any way to make this setup "tighter"?

I'm trying to build a robotic arm, and I had the following built so that there was the minimum possible movement created by the gear wheel (that connects to the worm). However, there is still play, ...
freefaller's user avatar
13 votes
2 answers
3k views

What elements do I need to create a smooth multi cheese slope ramp?

I love cheese slopes, but I am having issues when I try to produce a smooth gradient using several in succession. I end up with a gentle saw tooth effect at each junction. What combination of elements ...
Major Stackings's user avatar
4 votes
2 answers
4k views

What is the best way to make a staircase?

I have built a Bat Cave from some bookcases and lego base plates. ( http://alice-yarns.co.uk/blog/2013/11/17/the-batcave-part-i/ ) I want to add staircases for the characters to move between each of ...
Ru.Alice's user avatar
7 votes
1 answer
527 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 ...
Ailurus's user avatar
  • 263
2 votes
1 answer
169 views

Link 1 x 6 with Stoppers Part 2739b

Will Link 1 X 6 connect to Liftarm 2 Axle Holes and Pin / Crank (Part 33299)? The Link will be attached to a coke can, that needs to drive a crankshaft. 2739b from Peeron 33299 from Peeron
Bert Murray's user avatar
17 votes
1 answer
3k 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 backwards, the first gear does not move, but the second one does. I found ...
Ari Porad's user avatar
  • 273
9 votes
3 answers
9k views

Is it possible to create a custom differential if I don't have it as a ready-to-use element?

I have numerous gears, axles and other elements from different Lego Technic sets. I wonder if using them I can make a kind of differential like this? If not, how can I implement similar functionality ...
Sergei Basharov's user avatar
7 votes
2 answers
5k 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. ...
user3563's user avatar
5 votes
1 answer
228 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 ...
Sam's user avatar
  • 597
25 votes
7 answers
14k 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 ...
Courtny's user avatar
  • 713
1 vote
1 answer
508 views

Cell phone holder [closed]

Is there build instructions for an interesting cell phone holder that can be placed on a table? The holder needs to hold the phone upright and allow it to be charged at the same time.
Aaron Klap's user avatar
3 votes
2 answers
12k views

Where can I find LEGO Digital Designer projects for Lego Technic MOCs?

I have LEGO Technic pieces collected from multiple sets and would like to find projects on the web which I can view and build models step by step. Please advise sources where I can find these.
Sergei Basharov's user avatar
10 votes
2 answers
20k views

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.
Matcelo barrantes's user avatar
6 votes
4 answers
14k views

How to put LEGO together upside down

I'm building a truck. For the transmission, I want to make it all even and symmetrical. To do that I need the pieces to stay together but they have no studs connecting so they will just fall apart. ...
pacen13's user avatar
  • 61
10 votes
1 answer
2k 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 ...
Naveen's user avatar
  • 203
4 votes
1 answer
998 views

Extra pieces in my set - Eiffel Tower

I recently purchased a Eiffel Tower Architecture kit and I found it having 9 extra pieces. I know it is normal to have extras but I think the amount is a bit high. Any ideas or explanations? Does ...
user3278's user avatar
5 votes
2 answers
297 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, ...
Reven's user avatar
  • 1,019
5 votes
1 answer
2k views

Has Lego Box 5508 been discontinued?

The Lego Deluxe Box 5508 seems to be out of stock everywhere in the UK. I was hoping to get this set for my kids for Christmas, but it is nowhere to be found. Has it been discontinued? Or do they ...
Wheldrake's user avatar
8 votes
9 answers
49k 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 ...
Sergio's user avatar
  • 183
3 votes
1 answer
514 views

What pieces do I need to make suit swappers from the Lego Batman video game?

My son has asked Santa to bring him Lego Batman suit swappers to use with his minifigures, both Batman and Robin versions. Can anyone advise as to what pieces are needed for these? All help is very ...
Adela's user avatar
  • 31
3 votes
2 answers
2k views

Suspension bridge building techniques

I am working on a suspension bridge with my sons and have encountered two problems. Our technique: 8x6 plates for the roadway 1x8 bricks (with side-holes) underneath each side of the roadway to ...
Sam's user avatar
  • 597
4 votes
2 answers
342 views

Lego MOC joining query

I have a building query. As you see the picture (attached). I really don't know how the creator can attach the "3829c01" steering wheel to the "4070". I try so many rod like parts can't get through ...
user3091's user avatar
3 votes
1 answer
324 views

Using motors to ring a bell?

I would like to create a motor set up so I can use it to ring a bell inside a small tower. Since I haven't used any of the current LEGO motors was wondering what the group would suggest. which motor ...
JM Kraemer's user avatar
4 votes
1 answer
1k views

Strongest Vertical LEGO beam

In the LEGO house episode of James May's Toy Stories, the engineers built the beams with studs facing upwards: around 9.5 mins into http://youtube.com/watch?v=mEFPhXl3QQY How much stronger would it ...
Gnubie's user avatar
  • 851
6 votes
1 answer
932 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-...
Nguyễn Trọng Tùng's user avatar
5 votes
2 answers
4k 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 finish line. I can't use any controlling devices or electronics. I've an ...
B22's user avatar
  • 61
11 votes
3 answers
3k views

How do you construct odd-angles on buildings

I was thinking of building a model of the famous Castillo de San Marco located in Saint Augustine, Florida. A small bit of research shows that Legoland has a replica (flickr link) and that there are ...
Sam's user avatar
  • 597
3 votes
1 answer
346 views

Part assortments for creative building

I've been shifting away from collecting sets to doing more MOC building. I also recently moved and I'd like to reduce the overall size of my LEGO collection. I'm trying to decide which parts I'd like ...
jncraton's user avatar
  • 40.6k
4 votes
2 answers
924 views

Technique for multifacteted roof without 3049

I'm working on a project with a fairly complex roof in Dark Bley. In many areas, it seems to be necessary to use part 3049: Unfortunately, this part doesn't appear to have ever been released in Dark ...
jncraton's user avatar
  • 40.6k
1 vote
0 answers
229 views

How tall is a standard LEGO minifigure? [duplicate]

Sometimes I build towns of LEGO buildings, and occasionally the minifigures will get stuck in a low roof or underhang (pun intended). Does anyone know the height of a standard LEGO person in bricks as ...
Timtech's user avatar
  • 814
3 votes
1 answer
393 views

Has anyone just "built a tower"?

I've heard stories about it, but has anyone simply built a "tower" out of lego pieces and bricks? By a tower I mean lots of bricks on top of each other.
user2490939's user avatar
9 votes
2 answers
7k views

How can I find out what parts are in a 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 ...
Hello World's user avatar
12 votes
2 answers
24k 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 (...
Pat R Ellery's user avatar
12 votes
2 answers
2k 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?
bogen's user avatar
  • 825
2 votes
0 answers
336 views

Ideas for large NXT projects [closed]

I currently have 6 NXT sets. Can anyone think of some large scale projects that I could attempt using most of the NXT bricks and pieces together?
Monte Carlo's user avatar
6 votes
1 answer
626 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 ...
florent's user avatar
  • 71
15 votes
3 answers
2k views

What are the essential resources for learning the fundamentals of LEGO building?

After years of buying and building LEGO sets, my six-year-old son is tearing through the first level of the Master Builder Academy. He's fascinated by micro-building, and generally seems liberated ...
Jeff Severns Guntzel's user avatar
6 votes
1 answer
2k 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
norq's user avatar
  • 181

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