5
votes
3answers
45 views

Ideas to slow down RC PF train motor (Item: 88002)

I'm wondering if you already tried to slow down such a motor. I would like the train to run slower at all the supported 7 speeds. Anyway, at speed 7, the train just flies off the tracks.
14
votes
4answers
744 views

Can an axle be removed from this 'brick paradox'?

This blogpost on Technic Bricks briefly explains a few 'brick paradoxes' or dead ends. This particular model seems impossible to disassemble by hand: How can I remove the axle without ...
4
votes
1answer
123 views

Communication between two Ev-3 bricks

How the communication between two Ev-3 bricks is done over Bluetooth? What is the nature of data that can be communicated?
18
votes
3answers
1k views

What is the male:female ratio of gendered minifigures?

For many years now, Lego has provided more detail on the face and bodies of minifigures. One of the effects of this is that the usually visually gender-neutral minifigures of my childhood (with the ...
5
votes
1answer
79 views

lego pieces stuck together! a stick 6m w/flange and a nose cone small 1x1 triangle

My lego pieces, a stick 6m w/flange and a nose cone small 1x1 triangle, are stuck together. I've been trying to seperate them but they just won't. Any advice?
1
vote
2answers
221 views

Creating a native EV3B block

I'm trying to create a native block for a hardware sensor. I've got it working pretty well, but can't get it to show up in the "port view" as anything but a sound sensor. I really need the live view ...
1
vote
2answers
106 views

Find back start position?

I have a LEGO NXT robot, and after some movements I would like it to return back where it started. After some research, it looks like my best option is to revert the motors. To decode their movements ...
0
votes
3answers
65 views

MOC planning and design

What tools do you use when planning and designing a new MOC? Pen and paper? Or there is something more advanced? I had the insane idea to try LDD to design my MOC and it was a nightmare. Since my MOC ...
1
vote
1answer
309 views

Easy way to get the weight of a Bricklink order

Is there an easy way to estimate, to the nearest 100 g (or so) the weight of a shopping cart in Bricklink so that I can estimate the shipping charge (sellers may quote ranges such as "250 - 500 g: $X, ...
7
votes
1answer
521 views

How can I minimize the number of merchants for given set of requested bricks?

This question should be answered in Bricklink FAQ, but I didn't find answer there. I'm a casual Lego hobbyist, I have a few sets with random pieces missing, about two dozens of them. Some are truly ...
3
votes
2answers
254 views

Any good alternatives to BrickLink?

I'm trying to find certain bricks online, and of course, came across BrickLink. But it's so darn hard to use it; search is absolutely useless, and I can't figure out how to use the catalog for the ...
3
votes
1answer
80 views

What does BURP or BURPS stand for

Came across this one a few times (most recently here) where it links to a number of mountain elements: you still end up with some neat mini-BURPS and other useful pieces
5
votes
3answers
142 views

Was it once possible to put a 1x1 round into a minifig cup?

I remember being able to put a 1x1 round brick into the top of a minifig cup before my dark age (the period of time that a person stops building with Lego, up to the time they pick up the bricks ...
7
votes
1answer
78 views

What's the purpose of the clutch gear in Power Functions set?

I have just bought this set and wonder the purpose of the white gear in the middle: How can you use it in your Lego Technic projects? Is it available in other sets?
2
votes
1answer
217 views

Use iPhone camera as an input sensor for EV3

As EV3 has Bluetooth builtin as well as iPhone too, is there a way to connect them somehow so that iPhone could send data from the camera via Bluetooth to an EV3 brick? As a more general question, ...
5
votes
1answer
424 views

Why does my NXT colour sensor not recognise colour on my iPhone?

If I point the colour sensor to my iPhone it does not recognise it, but if I point it to a piece of paper, it does. Does anyone know if there is a solution for this? I found some documentation ...
12
votes
4answers
16k views

How can I wirelessly connect the NXT and an iOS device?

I've seen videos around YouTube (like this one for a car) that show an ability to control a Mindstorms set via iOS (either iPhone or iPod Touch). I am just getting started with Mindstorms, but find ...
4
votes
1answer
81 views

What lego set is this? Possibly a pirate ship?

my wife picked up this lego set at a garage sale. The owner claimed it was a ship, perhaps a pirate ship, and that the set was complete. It does have something resembling a bow, and several tall ...
8
votes
3answers
755 views

How can odors be removed from bricks?

I recently purchased some used bricks. They currently smell like cigarette smoke. What is the best way to clean these parts to remove the odor?
24
votes
13answers
4k views

Do LEGO bricks float?

Is it possible to build a boat out of LEGO bricks? I appreciate you couldn't make it watertight but would a LEGO boat float by itself due to the buoyancy of the bricks themselves? Pictures of any ...
30
votes
11answers
26k views

What's the most cost effective and efficient way to buy bricks?

After a 20 year hiatus I picked up LEGO again as a hobby. I've been into the Trains lately and need bricks. I found a couple places to pick them up but they all suck for various reasons. The first was ...
6
votes
4answers
372 views

Is there an organization who repackages old LEGO bricks into sets to give to underprivileged children?

Does Lego have a program by which we can return old LEGO parts so they can be reassembled into packages for underprivileged kids? My kids, and now grandkids, have always played with LEGO bricks and I ...
14
votes
4answers
4k views

Are LEGO bricks recyclable?

Yes, I know that it is kind of a dumb question, as no one would want to dispose of LEGO bricks. But it's a curiosity thing: are Lego bricks recyclable?
4
votes
1answer
43 views

Is it safe to remove PC (polycarbonate) arms from minfigures?

I would like to replace the clear PC arms on the Chima ice figures with opaque ABS. Would I still be able to use the clear PC arms with other figures after I have removed them? I know that removing ...
7
votes
1answer
79 views

How to restore old, scratched plates

I have some old lego plates that are quite scratched. They look rather dull compared to the newer pieces in my collection. Is there any way to restore (even partially) the shiny look between the ...
9
votes
2answers
780 views

How to remove scratches from LEGO windshield parts?

I was storing my windshields from cars with other my bricks. Now they are scratched, nearly not transparent just translucent. Is there a way to sanitize transparent parts from scratches?
4
votes
1answer
79 views

Chinese Knockoffs?

I'm looking at the Lego Super Star Destroyer on eBay and I see that a number of people are selling it for ~$600 USD. From time to time there are bids that sell at ~$300 USD that claim to be sealed and ...
1
vote
2answers
33 views

Legal free NXT-G download [duplicate]

Where can I get a legal, free copy of NXT-G for mac? I lost my disk when I bought my NXT, and I need to get a new program.
1
vote
2answers
168 views

Robot that searches for lights

I use Lego Mindstorms NXT 2.0. I want to schedule my robot to move to where there is light αnd then when it finds it (a large amount of light, for example 80%) to stop and move another motor for 30 ...
1
vote
1answer
76 views

EV3 parallel MyBlocks, but only one working

TL;DR = Is there any obvious reason why a MyBlock, added twice in parallel to a program, will only run one of them? In my EV3-G program, I have a MyBlock which uses the Proximity Heading to control ...
1
vote
1answer
47 views

Good EV3 iBook for programming or building

I am a participant in a Lego mind storms competition soon using EV3. I would like to know if there are good, free iBooks for me to download (PDF or iBook from the apple iBook store). Preferably the ...
2
votes
3answers
769 views

What is a normal range of reading of the Light Sensor using EV3 Raw Sensor block?

EV3 software does not support the Light Sensor. It does support the Color Sensor. The solution is to use the Raw Sensor Block. What is "normal" for raw sensor block readings? I'm getting readings ...
3
votes
1answer
51 views

What's the best way to machine LEGO pieces on a mill?

Does anyone have experience with modifying LEGO pieces on a mill? Any suggestions on cutting speed?
5
votes
2answers
232 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 ...
6
votes
2answers
2k views

How can I get my NXT to turn on - all it does is softly click?

Recently when I plugged my NXT brick into my PC I clicked on the wrong option and now all it does is clicks when I turn it on? How do I get it back to a usable state?
10
votes
1answer
543 views

What are the characteristics of “Miniland” scale?

I have heard many references to "Miniland" scale. From what I have seen, this style of building mostly includes figurines that are larger than normal mini-figs. What are some other characteristics of ...
19
votes
5answers
1k views

How can I build an (automatic) Mindstorms charging-station?

I'm thinking about buying LEGO Mindstorms and start programming robots. I'm a software engineer and LEGO fan since I was a child so this sounds like the perfect combination of my dearest hobbies. But ...
2
votes
2answers
46 views

Can't get EV3 to work with touch sensors

My FLL team just got a couple of EV3 sets and the kids were trying to program a simple switch that has the robot drive into a wall, back up, and turn right once the touch sensor in the front is ...
13
votes
8answers
1k views

Cleaning between the studs of a build

I've unpacked a few of my models after moving home some time ago, these models have been in a cardboard boxes for several months and need cleaning: I've tried compressed air, which only makes some ...
10
votes
2answers
772 views

Where can I get 'classic' Lego heads from?

The new heads with expressions are all well and good, but I for one prefer the expressionless 'classic' faces. Are they available anywhere?
5
votes
1answer
47 views

Pass sensor or motor port number as a parameter

I want to create a block for one light sensor or one motor separately. Is it possible to give the number of the port as a parameter to a sensor or motor block via data wire? In NXT-G it was possible.
9
votes
2answers
123 views

Difference between LEGO Castle and LEGO Kingdoms

Can anyone explain what the difference is between LEGO Castle and LEGO Kingdoms. I don't understand why they are not in the same product group. Also LEGO Kingdoms is no longer listed on the lego.com ...
4
votes
2answers
157 views

Older sets in The Lego Movie?

Are there any existing/hisorical complete sets (for example: buildings, vehicles, etc) featured in The Lego Movie? Sets created specifically for the movie do not count. For example, the bad cop's ...
2
votes
1answer
119 views

EV3 Rapt3r's head cable interfering with slithering

My Rapt3r is working great, except that the cable that goes from the head to the "Intelligent Brick" physically interferes with the slithering on the side on which it is plugged (port 4). Physically ...
11
votes
1answer
1k views

A piece with no place in Heartlake Stables

I recently bought this set for my niece for her birthday, when we were finished setting it up we noticed a larger orange piece that we couldn't find a place for but was in the set and in the back of ...
4
votes
3answers
93 views

Design of record-breaking builds

This is more a theoretical than practical question... If one wanted to build a 40-metre tower out of only Lego using the fewest pieces or cost, what design would be a good one, e.g. types of pieces ...
4
votes
4answers
608 views

What other uses are there for pull-back motors?

Sets 42010 and 42011 feature a pull-back motor. They have a very high torque for a very small numbers of turns, they then free-wheel. I'm trying to find alternate usage for them. That is anything but ...
13
votes
3answers
54k views

Where can I download the LEGO Mindstorms NXT 2.0 IDE?

I want to see how well that IDE runs on my old Windows XP laptop. I looked on www.lego.com, but it seems to all be documentation (downloads).
9
votes
1answer
240 views

How much depth does the NXT battery pack add?

The NXT rechargeable battery pack does not fit flush with the back of the NXT brick like the battery cover (used with 6xAAs) does. I don't have the battery pack (yet), so I was wondering how much ...
9
votes
6answers
19k views

How to fix Mindstorms Error Code 1003

I am using the Lego Mindstorms NXT Education Kit, software version 2.1. Everything was working fine writing programs and downloading them to the robot until all of a sudden when I tried downloading a ...

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