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15
votes
1answer
768 views

How much tension can I expect to get out of a lego chain before it starts to give away?

Assuming I am using the technic chain links to make a chain, how much force can I expect to be able to get out of the chain before it breaks? Suppose I am using a 16t gear to directly drive a 24t ...
10
votes
0answers
260 views

How does the LEGO Typewriter mechanism fit?

My wife is building the LEGO Typewriter set (21327). When she installs the gearbox mechanism at step 210, the whole thing jams when pressing the keys. I am trying to help her and have "unbuilt&...
8
votes
0answers
172 views

Are LEGO Quatro compatible with larger bricks? Soft Bricks or other?

There is a nice discussion here on LEGO+Duplo+Quatro compatibility. I posted what I found here where a LEGO storage block is the right dimension to be double a Quatro (4x Duplo, 8x normal). However, ...
7
votes
0answers
169 views

Digital tool for roller coaster physics

I'm currently working on a roller coaster MOC with a looping. I started physically building the MOC but quickly recognised that it is quite a mess to build something, tear it down rebuild it, etc. ...
6
votes
0answers
104 views

Old Lego duplo train not working on batteries

I've recovered my old lego duplo set from the attic, and tried to get the electric train working again. After inserting fully charged batteries, the train does start, but it's unable to pull even a ...
6
votes
0answers
108 views

LEGO or LEGO-compatible control for SG90 servo?

Is there a way to control three-wire servo (for example the SG90 servo or other common models) by LEGO Power Functions or CaDA power function?
6
votes
0answers
101 views

Oil for old 4.5v electric motor? (UK)

Hi I've just got my old lego technic motor from the loft. It works but squeals in a way I don't remember it doing (35 years ago). I assume some lubrication would help and I've seen references to 3-in-...
6
votes
0answers
648 views

Building instructions: Robot Spider Pen by Ricardo Oliveira

Some time ago I found the following youtube video by Ricardo Oliveira of a small NXT plotter that crawls over a whiteboard. It has two strings that can be shortened through coils and with this, it ...
6
votes
1answer
196 views

Toa Terrain Crawler alternate build instructions

I was building the LEGO Bionicle Toa Terrain Crawler, (8927), when I saw at the back of the instructions a photo of an alternate helicopter-type build. Where can I find the instructions on how to ...
5
votes
0answers
165 views

what plastic is used in the floatable hull of 60266 Ocean Exploration ship?

I need to know what plastic is used for the hull (dark blue) of the 60266: Ocean Exploration Ship, in order to glue a reinforcement on. I bought this for my boys (younger than the advertised 7+). It ...
5
votes
0answers
167 views

Identify brand of these non-LEGO parts

I bought a bulk of bricks, some of them are not LEGO, but the quality is perfect - gloss, fit, plates have groove, transparent parts are clear. I would like to know which brand also produces such nice ...
5
votes
0answers
82 views

How do I fix a loose joint between the top and bottom of the digger base?

How do I repair a loose-fitting joint between the top and bottom of the Duplo digger base? It has been used for only about a year. Is the wear more likely on the top or the bottom piece?
5
votes
0answers
63 views

Connectivity graph for a digital model

I'm looking for a way to take a digital representation of a model (e.g. an LDD or LDraw file) and extract from it a representation of the model that describes which pieces are actually connected to ...
5
votes
0answers
328 views

Lego Boost distance sensor, what range does it have?

While programming our Lego Boost set (using the Lego Boost App on iPad) I noticed that the distance sensor seemed to give inaccurate triggers. To try to confirm this, I connected the move hub to my ...
5
votes
0answers
590 views

MouldKing set 13132 - Original design, alternate build or cloned MOC?

It seems that Chinese clone brand Mould King will be producing a new set that looks a bit like LEGO's Disney Castle set (71040). It has two times as many parts, however, and unlike LEGO's Disney ...
5
votes
0answers
860 views

Which Lego set has had the most Easter Eggs?

With the release of the new Harry Potter Hogwarts Castle (set: 71043) has 6,020 pieces. I believe this a subtle reference (Easter egg) to the Lego set 6020, one of the first sets to ever have a ...
5
votes
0answers
173 views

String thickness comparison

I am currently working on a project which uses a massive array of strings linking little levers. I am currently using the "thin" type string as it is the only type I have, but I am running into ...
4
votes
1answer
189 views

LEGO Bugatti Issues

This is my first post and my first LEGO set. I recently built LEGO Bugatti Chiron with all the features working. I am however having an issue with the real axle/wheels. The read break calipers fall ...
4
votes
0answers
179 views

Help identifying non Lego blocks

I'm in the UK. I've been given a box of old Lego bricks from when I was a child (80s). These were mixed in. I seem to recall they made a house perhaps? They are larger than Lego, smaller than Duplo (...
4
votes
0answers
66 views

How to pose figs in LeoCAD?

I’m new to LeoCAD. I find it’s easy to add regular minifigs or Technic figures to a model, but I can’t find a way to pose them. For instance I could build a car and add a driver, but the figure is ...
4
votes
0answers
154 views

Piece stuck in LEGO T-Rex body part nr. 6223585

My son stuck a rod piece through one of the openings in the T-Rex body middle part (part# 6223585). How can I open up the body to retrieve the rod piece? The body is made of two parts that are clipped ...
4
votes
0answers
168 views

What's this rod part?

Any ideas? I can't find a part number anywhere.
4
votes
0answers
39 views

How do I sync audio and movement on my NXT 2.0?

How do I sync audio and movement with my NXT 2.0? I'm building an animatronic head and I can't find a good way to sync it with external audio because the internal speaker is too quiet.
4
votes
0answers
82 views

Migrate Lego Boost Android app data to another device

I have a Lego Boost Android application installed on device #1 and the app is logged into my LEGO cloud account (the same used for Lego Life etc. too) and is fully synced with cloud. On this device I ...
4
votes
0answers
132 views

Repairing a 12V switch motor

My son caused me to dig up my old 12V lego trains. Surprisingly they mostly work, except for one part: https://www.bricklink.com/v2/catalog/catalogitem.page?P=70026&idColor=9#T=C&C=9 This is ...
4
votes
0answers
256 views

Unknown Minifig Accessory (chrome silver/pearl gold)

I got a bunch of these in a bulk bin and cannot figure out what they are. It is possible they are not lego itself as I cannot find a lego logo on it anywhere. Anyone know what they are?
4
votes
0answers
294 views

Lego Mindstorms NXT 2.0 Not turning on

I have a Lego Mindstorms NXT 2.0, which worked well for a couple of years. However, after the last few weeks, it seems to not boot up. I took it apart, and noticed it seems to have a different ...
4
votes
0answers
230 views

Europe based printing services for low quantity high quality custom printed tiles

I've found many websites providing a service for custom printing of LEGO tiles : United Bricks Brick Engraver BrickSanity Fab-Bricks Citizen Brick EclipseGrafX Minifig Madness BrickTactical ... I ...
4
votes
0answers
415 views

How to build an arch that is angled out of Lego?

I am currently working on a MOC for the USS Orville and I am trying to figure out the engines. I have gone through a couple of iterations on my current version, but it always buckles under its own ...
4
votes
0answers
803 views

Ev3 spik3r mission 2 doesn't move

So I was building Spik3r and I thought I got mission 2 completed. Wheels are turning, legs are moving but the robot just does not move. It looks like the small wheels should be moving the robot but ...
4
votes
0answers
476 views

RCX + java + usb-to-serial

I am trying to get an old RCX working with leJOS. I already have it working with NQC and BricxCC. While NCQ/BricxCC seems to recognize my usb-to-serial (which appears as "COM5" to the OS), the leJOS ...
4
votes
0answers
659 views

Daisy chaining EV3 with RobotC

I'm trying to run EV3 programs with RobotC and trying run on EV3 Daisy Chaining. I have three independent EV3 bricks labelled A,B,C. I want, according to the color reading by the color sensor on ...
4
votes
0answers
501 views

LEGO turing machine using Rascal

I followed the instructions on LEGO Turing Machine and succeeded to build it. Next I've tried and failed to program it using NXT Mindstorm GUI. The site mentions a Rascal framework, but it doesn't ...
4
votes
1answer
102 views

Does anyone know what this piece is? 3224730, with a bar at right angles to two more-rectancular bits

I found this piece and don't have any idea where it came from or what it would be used for. The number "3224730 2" is stamped on the side. For scale reference, the long round bar portion ...
4
votes
1answer
391 views

How to power up MOC-0308, based on Technic 8297 Off-Roader?

I have built the following MOC, with details here and here. It is pretty complete, although I would have tried some servo motor for steering. But after I've finished it, I've got into trouble: ...
3
votes
0answers
31 views

Delete projects from Mindstorms EV3 Brick

I am using Lego Mindstorms with https://makecode.mindstorms.com/ and once the projects are downloaded to the brick, I cannot delete them anymore.
3
votes
0answers
77 views

What electronics are inside the Spike Prime motors and sensors?

Is there any information available about the internals of the SPIKE Prime (SPIKE Essential) sensors? What Hall-Sensor is used by the SPIKE motors? To be more precise: I'd like to get information about ...
3
votes
0answers
42 views

Is it possible to convert .part to .dwg, and if so, how?

Is it possible to convert a Part Designer part (.part file) to a CAD file (.dwg, for example)?
3
votes
1answer
113 views

Robot Inventor Bluetooth not working

A while ago, I started up the Robot Inventor program and noticed the computer was not connecting. When I clicked the "Connect" button, the loading "circle" simply started spinning ...
3
votes
0answers
139 views

Seeking instructions to finish partially assembled custom Lego satellite (Orbital Science Corporation)

This week I found a partially assembled Lego satellite and I wanted to build it but I can't find the instructions to finish it. The satellite I'm 90% sure is a scale model from a satellite launched by ...
3
votes
0answers
47 views

How do I import my programs from makecode (ChromeBook) to my EV3 robot

While using makecode I wanted to import my file to my EV3 robot but it says that I have to connect my EV3 robot to my computer then move the file to the robot. But since I'm on chromebook I don't see ...
3
votes
0answers
99 views

Technic Medium Hub - Supported Gestures of Gesture Recognition Sensor?

I am in process of writing a .NET library for PoweredUp and I am currently trying my luck with the Gesture sensor in the TechnicMediumHub (aka Control+ Hub). Below the dump of the Port(Mode)...
3
votes
0answers
63 views

EV3 motor port works in motor control but not in demo mode

I have a new EV3 set and tried running the Demo program on the initial build. Only the left motor turned, so the robot kept going in circles instead of going straight like its supposed to. When I ...
3
votes
0answers
168 views

Adding custom / recorded sounds for power-up

The Powered Up application offers many more sounds than the BOOST app, but the later allows for recording of extra sounds... How could someone add / record custom sounds for powered-up App?
3
votes
0answers
202 views

Gonk droid spinning saw blade

This is the Gonk Droid from set 75253 Boost Droid Commander: The accessories for the third mission "defending the Falcon" have been added. The right arm can punch and shoot a "laser beam". However ...
3
votes
0answers
381 views

Can you tell me where this Mega Bloks part is from?

I found this part and was wondering what set it's from, thanks!
3
votes
0answers
422 views

How can you get the pipes on Steamboat Willie to work reliably?

We recently began building 21317 Steamboat Willie. We've got it mostly built, but the pipes keep getting stuck. The rear one works, but the front one keeps getting stuck up and won't go down. We've ...
3
votes
0answers
166 views

Why are Printed Lego Catalogues Distributed Late?

Today is January 29, 2019, and toy stores in Germany (at least a couple that I've checked) still have only some remainders of 2018 July - December catalogues. 2019 January - June catalogues are ...
3
votes
0answers
357 views

EV3 Brick and Commander app Bluetooth disconnecting

On iOS on an iPad, we're having an issue with the EV3 Brick and Commander app Bluetooth connection constantly disconnecting. The brick just stops responding, so we turn the brick off to disconnect and ...
3
votes
0answers
530 views

Why can't I install the NXT software on macOS High Sierra?

I just got an Mindstorms EV3 for Christmas, and learned that you can have the NXT communicate with the EV3 in the NXT software. I tried to install the NXT software on my Mac, but all that happens is a ...

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