Uli
  • Member for 3 years, 7 months
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What LEGO pieces have "real-world" functionality?
46 votes

All Aboard! I'd like to add my all-time favorite LEGO piece: x870cc02, THE BLACK WHISTLE! The white brick is a microphone. Attach it to your train's motor and BLOW THAT WHISTLE! Depending on how ...

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Identification of vintage sloping window piece
13 votes

Must be Fabuland Front Window Squared Small, Part x652 on peeron.com (image source peeron.com)

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Why do technic bushings have a flat side and a wavy side?
Accepted answer
12 votes

The answer is studs. Note that there are more pieces with the same ability. Orientation of the bushing does matter when you run a rotating axle through a technic plate. Have the round side of the ...

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Mystery 2x14 grey brick - cannot find instructions with this piece mentioned
Accepted answer
12 votes

This is item no 812 Train Level Crossing Center Rail Cap Insert 2 x 14 x 2/3 made for item no 813, the railroad crossing. (source: bricklink) It replaces the 12V straight insert (i.e. it closes ...

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Connecting an axle to a stud on the ground for railings
Accepted answer
11 votes

For the axle with stud on one side you could also use a smaller pin connector 18654.

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Can anyone tell me which LEGO set this is?
11 votes

Y-Wing Starfighter, set 75172 from 2017 It comes in five bags. Building instructions at lego.com

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Trying to identify old 2x4 plate
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10 votes

This 2x4 plate belongs to the housing of an old 4.5V train motor. There are some scratches on the edge of your plate, most likely from an attempt to pry it off with a screwdriver.

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Lego track switch doesn't close properly
Accepted answer
9 votes

Warning: LEGO pieces were harmed for this answer How the switch works So, how does it work then? Well, let's open it up! The back plate is held into place by 14 pins. We'll carefully pry it open ...

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Can you help me identify this set?
9 votes

This bag is part of Set 76015-1 from 2014 Ultimate Spider-Man, Doc Ock Truck Heist

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How can I assemble 2 opposing gears so that the axle rotations are perfectly parallel?
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9 votes

How can I get 2 opposing gear's axles to be perfectly parallel? Are there any good workarounds? You could use an idler gear. It will even out the offset. Yet, at the same time, it (or any odd ...

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How to integrate hardware/embedded button with LEGO?
Accepted answer
6 votes

For the first switch I bent the legs of the button and splayed them out just a little bit. Next I stripped off the caps of two Dupont connectors, ran them through the headlight bricks and connected ...

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Combine Duplo feet with regular LEGO
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6 votes

Scientific progress goes OINK! This is an older DUPLO pig from the 70's, and its different design offers us some new possibilities. For example there's a rectangular hole below the neck. Now ...

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2:1 gear ratio in stud-less Lego Technic
6 votes

Here's a solution I found in Yoshihito Isogawa's LEGO Power Functions Idea Book Vol. 1 - Machines and Mechanisms: EDIT based on Eric's comment: And here's using the black piece from JohnnyB's tweak:

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Please identify the set(s) that these come from
Accepted answer
5 votes

Ho Ho Ho! Your four sealed bags (from first through third images) are Mr. Claus and Mrs. Claus Item No: 40274-1 Building instructions at lego.com

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What is the longest 1×x brick ever released?
5 votes

You didn't say anything about modified 1 x bricks. This is Item 47978 and it is actually listed as a 2x24 brick, because of the added bit in the middle.

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Horizontal connection between plates
4 votes

Mr. Blue and Ms. Red live next doors. Their houses are simple. The walls are one stud wide, the ceiling's one plate thick, some slopes on the roof. Now they want to move their houses wall to wall. ...

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Identifying a set with brown curved top and circular gray pieces on the sides
Accepted answer
4 votes

I think this is from LEGO Star Wars Set 9491-1 , Geonosian Cannon.

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1/3 of 4 studs wide possible?
Accepted answer
3 votes

You're right. They cheated. This youtube video shows the Robot Lab from a different camera angle. Here you can clearly see what looks like three 1x2 bricks on a 2x4 brick of the same width. Cheaters! ...

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How can I prevent my finger from getting injured between gears?
3 votes

Here's an idea for a stop switch using a remote control and one's wrist. Place your wrist on the switch to start the motor. With your hands free you're still able to carefully adjust your running ...

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What is the white building pictured in the San Francisco (21043) set?
3 votes

So it's Salesforce West Tower. Or is it? Here's the heights, according to wikipedia. Seems like the proportions are good. Except for Salesforce West Tower. At 600 ft it should be almost half the ...

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What 1x8 ski part is this?
Accepted answer
3 votes

This seems to be item No. 2823 Technic Forklift Fork (white) It was part of four sets: 6342-1 Beach Rescue Chopper 6545-1 Search N' Rescue 6401-1 Seaside Cabana 6663-1 Wave Rebel All images ...

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What is the fastest way to estimate the number of pieces in a large collection?
Accepted answer
3 votes

What a tricky (bricky!) question. Let's estimate... By Weight So, can one estimate the number of bricks in a bag or box by weight? In fact, they do weigh bags and boxes over at the factory to make ...

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How to prevent my connected axles from falling apart?
2 votes

If you want to stick to your current design (despite its obvious flaws), then here's another idea. Let's go! As you can see, I tried to rebuild the crucial part of your framework. Alright. Now two ...

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What is this brick and how do I use it?
1 votes

This is Record and Play Module, 16 x 10 x 4 with Built-in Motors 4.5V (Item No: 3173c01)

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