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Questions tagged [building]

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

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5 votes
2 answers
1k views

How can I attach a Technic Linear Actuator to a EV3 Medium Motor?

I'm pretty new to serious LEGO building (never got past very blocky houses as a kid but got into Technic a couple of months ago) and need to connect a Technic large linear actuator (61927) to a ...
3 votes
1 answer
5k views

How to build a flywheel slider crank piston pattern with LEGO Technic?

I'm not sure of the name of the pattern, feel free to edit the title if you have a better name for the pattern commonly used in engines. I was just wondering if anyone has built this specific pattern ...
10 votes
2 answers
5k views

Homemade methods for interfacing a Hobby Servo with LEGO bricks

I'm looking for a non-destructive way to structurally attach a standard hobby servo with LEGO bricks. I'm interested in answers for either Large, Medium, or Small size servos. I'm using LEGO ...
6 votes
2 answers
7k views

Pattern for vertical motion using LEGO Technic

I have a motor and some other components that move a machine vertically on the ground. Inside the machine I need to raise a part by 5 cm, up and down. Are there some common patterns that can move ...
14 votes
3 answers
1k views

How can I build a human-scale Lego gun?

I would like to build Lego projectile weapons. Are there any designs available? Can one make an amunition magazine and self-reloading mechanism? Should I use rubberbands as ammunition or are there ...
-1 votes
1 answer
102 views

Trouble steering and drive

I am having trouble with getting a differential and a rack-and-pinion steering mechanism to work together without being unstable or inaccurate. I don’t have the special wheels (rims/tires), ball ...
14 votes
2 answers
4k views

What are all the different ways that LEGO pieces join together?

Has anyone made a list of all of the different types of connections between LEGO bricks? Obviously there's the stud connection - but there's also the ball and socket joint, the more recent click-...
-1 votes
1 answer
92 views

Gearbox trouble

I have tried many times to make a 6-speed gearbox with drive, neutral, and reverse, but all I can find are people with many clutch gears, driving rings, and all of the other special parts, such as the ...
8 votes
3 answers
4k 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-28-...
1 vote
2 answers
87 views

Custom Shock Absorber

I have tried making a custom shock absorber, but every option I see uses springs or is too bulky. Is there any way to make a custom LEGO shock absorber using rubber bands? I'm thinking of 6x1 studs ...
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 ...
4 votes
1 answer
1k views

Has anyone else had problems with the tail rotor drive shaft on the Lego Airbus Model 42145?

I am partway through this build and at step 565. I have found the drive mechanism to be very tight and have tried to loosen the drive elements as much as possible. I have found what I think is a ...
11 votes
1 answer
569 views

Plate perpendicular to bottom of 2x2 round: is this connection legal?

I've played enough with 2x2 round plates and 1-stud-wide plates to know that it's possible to attach a plate underneath a 2x2 plate and perpendicular to it, like so: The same connection is possible ...
0 votes
1 answer
118 views

Designing a customized, life-sized model/copy of flower vase

I am a noob! I am trying to create an anniversary a present. I want to create a life-sized LEGO, customized vase, that was given to me as a present. I plan on putting Lego flowers in the vase. I have ...
3 votes
1 answer
142 views

Create a gimbal like structure with Technic gears

I would like to attach a sensor to a plate, and tilt that plate slightly in the XY direction respectively, without moving the plate itself. Similar to this (force feedback joystick concept) like this ...
2 votes
1 answer
96 views

Parts similar to 2x4 hinge plate

I can't find a similar Lego piece. It should be like in the photo, only solid and thicker, I remember I had several of these yellow ones, but I lost them. https://www.ebay.pl/itm/372966718634
6 votes
1 answer
202 views

Attaching a laptop to a table

I want to give my minifigs a few laptops. Specifically, 62698 "minifigure utensil, laptop"s: I've seen laptops in sets and MOCs, but always either (a) closed, being held in a minifig hand ...
4 votes
0 answers
79 views

Do rollercoaster wheels clip into any part other than the rollercoaster base? [duplicate]

Normally the rollercoater wheels (part 24869) clip into the dedicated rollercoaster base (part 26021). Does anyone know of any other parts these wheels will clip into and rotate as smoothly? Part ...
6 votes
1 answer
3k views

Grand piano page 269 of instructions - are the gears suppose to stop after a quarter turn or keep going when reversing directions

The directions show the gears are suppose to move counter clockwise. When I follow the directions on page 268-269, and push the reverse button on the Lego power-up app for the Grand Piano, the gears ...
2 votes
1 answer
192 views

Is it possible to angle the wheels on Speed Champions?

I have got quite a few Speed Champions sets and I like building MOCs to photograph them in. However, I feel like the photos would look more dynamic if I could angle the front wheels, to look like some ...
4 votes
1 answer
1k views

Piece in Lego 21327 Typewriter Step 26 can’t be flush as depicted in the illustration

When sliding part #6327028 down the left three rods as depicted in step 26, that piece becomes snug with the gray spacer piece from Step 25, but there’s a gap on the two left rods. The 1x5 black ...
5 votes
1 answer
2k views

Why doesn't this Technic bar fit?

Why doesn't this yellow Technic bar fit?
4 votes
1 answer
2k views

I am building the LEGO 42131 D11 dozer and some of the parts are moving in reverse when testing

I am building the D11 dozer and some of the tests like 2 and 4 are moving the parts in the opposite direction that they are supposed to be going. I took apart the entire build and rebuilt it and the ...
9 votes
1 answer
375 views

5x3 Half Round Problem

How can I hide on top of this with tile pieces? To make it like this: Edit: Thank @jncraton for the solution Before answering I made it like this: But now it looks way better and it will be more ...
4 votes
1 answer
128 views

Getting started creating LEGO kinetic sculptures

I’m brand new here and fairly new to LEGO. I’m an adult artist who wants to make LEGO-based kinetic sculptures. Can anyone point me in the right direction? My experience is very limited — as a child ...
3 votes
0 answers
171 views

Building technique for modelling Thomas the Tank Engine faces

I'm building Thomas the Tank Engine trains, and I'm looking for techniques to build realistic faces. I'd like the trains be able to run on standard LEGO rails, so I'm targeting 8-wide engines. This ...
0 votes
1 answer
187 views

Has anyone had problems fitting the stalactites and stalagmites in the 76252 Lego Batcave?

I have got to stage 403 and, whilst I have had problems fitting the pieces together previously, at this stage I simply cannot get the stalactites or stalagmites to fit into the studs - they seem to ...
4 votes
1 answer
235 views

Change Mario Yoshi pose

I'm returning to Lego as an adult and struggling with what I thought would be a small project. Please tell me if this is off topic but as it has a hard answer of no or this is how I though it would be ...
7 votes
2 answers
765 views

Converting Nanobocks builds to LEGO

Had anyone attempted and had any success in converting a nanoblocks build to use LEGO bricks? On the horizontal plane, the nanoblocks bricks seem to be half the size of LEGO bricks (4mm x 4mm versus ...
2 votes
8 answers
2k views

What is the largest number of pieces in a set for LEGO, Nanoblock, or any other brand?

What is the largest number of pieces in a set for LEGO, Nanoblock, or any other brand? I recently bought a 6800-piece LOZ Block set (Chinese Nanoblock knockoff). I was wondering if there are sets in ...
7 votes
2 answers
4k views

Help with Lego Typewriter 21327 - can't get the carriage mechanism working

Two AFOLs here who are stuck on the Lego Typewriter build. We have built large and complex sets before, but this one has us stumped. We have now rebuilt Sections 5-7 twice, but we can't get the ...
10 votes
5 answers
1k views

How to make a regular pentagon from technic bricks

For the purposes of this build, we need a pentagon (figure with 5 sides), that is regular (all sides have equal length), and it needs to be able to be mounted on a build (like a wreath) by a technic-...
17 votes
3 answers
2k views

Technique for connecting a tile vertically next to a brick

I'm trying to create this effect, where a 1x1 half-circle tile seems to 'stick out of' a 2x2 brick at 90 degrees: This is easily achieved with a 1x1 tile with light attachment, as seen here from the ...
8 votes
1 answer
180 views

How is this setup created?

From https://www.newelementary.com/2018/10/lego-35787-tile-modified-2x2-triangular-45-cut.html midpage there is this setup: Can anyone provide more details how the parts are connected? Preferably so ...
3 votes
2 answers
186 views

Salt Lake Temple: window bordering

I'm trying to replicate the stonework above the arched windows on the main side of the Salt lake temple. my current approach is to use a combination of 1x2 SNOT brick to face outward 1x2 jumper plate ...
6 votes
1 answer
589 views

How can I add 1x4 tile stairs to my octagonal gazebo model?

How can I add 1x4 tile steps to the bottom of the front opening in the gazebo model below? The base of the gazebo is a 10x10 octagonal plate (part 89523). I have tried using wedge and round plates ...
3 votes
2 answers
810 views

How can I build a Lego slope of a rough 50 degree angle with preferably legal building techniques?

I am currently building a functional Lego minifigure-scaled escalator that can transition from flat platforms to stairwell. My first iteration for its guiding rail includes a slope of ~39.5 degree ...
-1 votes
4 answers
242 views

Are there any flat plates with beveled or sharp edges?

I'm currently making a functional minifigure-scaled escalator that ideally move like this. Progress has been made on both the stair slope and staircase design (both respectively pictured below), and ...
18 votes
6 answers
42k views

Estimate building time for a given LEGO set

I'd like to be able to estimate better how much time a LEGO set will take me to build. Are there any resources online that indicate average or fastest building times for a given set? I suppose it also ...
10 votes
1 answer
1k views

How does the play experience work in the City Missions sets?

I recently saw one of the LEGO City Missions sets: According to the box, these sets are "built with stories, not instructions". How does this work in practice?
6 votes
1 answer
391 views

Is a huge box of old unsorted Lego and non-Lego pieces with no instructions or boxes of any value?

I have an old big bin of at least 20,000 Lego and Lego-like pieces. I never kept the boxes or the instructions when I was finished building sets and I have Lego pieces from at least 50 different sets, ...
5 votes
1 answer
223 views

Is there a way to keep fragile models together?

My late husband built a number of Lego models that I would love to keep together. However having a 5 and 2 year old around this is proving difficult and parts keep getting knocked off. Is there any ...
5 votes
1 answer
745 views

How do I build my LEGO slope so it connects to the flat top without any notable ridges?

I'm currently building a functional LEGO escalator that is minifigure-scaled and with staircases transitioning from flat platform to stairwell to flat platform. Here's my progress so far: Here's the ...
3 votes
1 answer
707 views

Lego 21327: How do I attach the typewriter segment to the body?

Typewriter build step 312. Red arrows point to two upraised open connectors. What part of the segment snaps into them? If snapped to the rod outside of the two gray mid-rod spacer pieces (step 309), ...
8 votes
2 answers
969 views

How to integrate hardware/embedded button with LEGO?

I have two different buttons (B3F-1000 and 3a250vac switch) which I want to integrate into a LEGO "machine" which I'm powering with an Arduino. Since the rest is integrated into LEGO plates, ...
2 votes
1 answer
316 views

Lego 21323 Grand Piano - After setting up app on page 110 of instruction, the gear is turning anti-clockwise instead of clockwise as shown

After completing all builds till page 108 of the instructions, I installed the app. But when I press play on a song the gear move for a quarter turn anti-clockwise but the picture on page 110 shows ...
3 votes
1 answer
292 views

Salt Lake City Temple: Temple doors

I'm building the lds temple in Salt Lake City in lego. I'd like to represent the temple doors as seen here: My current plan is to use the stockade as the base door: ...and probably put a plate over ...
5 votes
1 answer
195 views

Mistake with hook holder (steering arm with round socket) on Technic Helicopter 42145

I made one small (but costly) mistake in my otherwise very satisfying build for the Airbus helicopter: at step 66, I connected the grey piece "steering arm with ball socket" the wrong way. ...
8 votes
1 answer
146 views

Best method for building large by assembling modules?

I am about halfway in building a 16 foot high tower made of simple bricks. It is basically a hollow skyscraper 6 inches square, with the walls two studs thick. To steady it, it is built around a steel ...
1 vote
1 answer
5k views

Cat D11 LEGO set won't start the calibration process

As soon as I start the calibration process in the app, the gearbox jams. It doesn’t do anything, just clicks and clicks (stripping the gears). Any ideas what the cause might be?

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