All Questions

12
votes
0answers
139 views

Is it possible to dismantle and refurbish an original 870 Technic motor?

I have a couple of ancient 870 motors (the 4.5v ones) that run but don't sound great. I've looked for, but can't find, a guide on how to dismantle them. I'd like to either get in there and clean/...
9
votes
0answers
231 views

Step 160 on carousel 10257

I'm struggling with step 160 where I use white "hinge" connectors to connect the carousel platform sections. It seems to create too much pressure and the platform breaks apart. Grateful for any tips.
8
votes
0answers
177 views

How can body segments be moved to precise angles in snake robot?

I want to create an EV3 robot similar to this: I've glanced at the mentioned papers. To me it seems that some simpler equations to govern the motors will work also. I have 9 segments, articulated by ...
7
votes
0answers
217 views

Can anyone identify the brand of this non-LEGO brick

Hi folks I was hoping someone out there may recognise the brand of this block I found in the garden. I have been searching but the closest I can find are Locblocks - however this appears to have a ...
6
votes
0answers
76 views

Is it possible, to remove a parted out set from Bricklink inventory?

I have an inventory in Bricklink, in which I accidentally parted out (with the consolidation option) two sets instead of one. Is there a way to remove the pieces of the second set somehow without ...
6
votes
0answers
164 views

What are the common quality issues seen in collectible minifigs?

TLG is currently seeking specific feedback on what quality issues may be present within the Collectible Minifigures line so that these issues can be addressed. What are the common issues that you have ...
6
votes
0answers
171 views

Where does the EV3 software store its crash reports?

I cannot find where the crash reports generated by my EV3 software are stored. I have looked where it tells me to, but I can't find any.
5
votes
0answers
89 views

Why do Star Wars sets include the Disney logo/brand name while Marvel Super Heroes sets do not?

I have noticed that LEGO sets from the past few years of their Star Wars theme include a prominent, or at least noticeable, Disney logo, typically in one of the corners. For example, see this Imperial ...
5
votes
0answers
71 views

Replace Battery in LEGO Dino Attack Light-Up T-Rex Head?

Is it possible to replace the battery of the LEGO Dino Attack T-Rex heads? There's a button on the top of the head that makes the eyes and tongue light up red. There doesn't seem to be any obvious ...
5
votes
0answers
553 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 ...
5
votes
0answers
58 views

Is it possible to use the Dexter WiFi Sensor with Robot C?

My wife bought me a Mindstorms NXT system a few years ago and I bought a Dexter WiFi sensor for it, by the time I got a chance to work with it, I found out the sensor had been "retired" and that the ...
5
votes
0answers
334 views

PC To NXT Brick via Bluetooth

We have a fully-working java programme which can connect to another computer and can send messages from this(both sides run java and we used SPP Server and Client), however when trying to connect to ...
4
votes
0answers
101 views

Ordering of Pages in Printed LEGO Catalogues

While looking at some of the scanned LEGO catalogues on BrickSet, I have noticed that the UK catalogues (at least the ones I looked into) seem to be ordered "backwards" compared to what I'm used to ...
4
votes
0answers
49 views

I'd like to build a mechanism to press buttons on a remote control. What is a good basic approach to use?

I have a small remote control like device with about 11 buttons. The centers of each button are placed about 1.1cm apart, and each are about 0.7cm in diameter (this means about 0.4cm between the edges)...
4
votes
0answers
88 views

Two LEGO Powered Up engines with reverse direction

I have 2 LEGO 60197 City Passenger Trains and I would like to attach both sets together and un them on the same channel. The problem with the current disposition of the bogies is that reversing the ...
4
votes
0answers
82 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
0answers
373 views

Duplo rail accessory compatibility with older trains

Are the new Duplo rail accessories, like #6225521 and #6225519 (appearing in, for example Duplo #10872: Train Bridge and Tracks; #10874: Steam Train; and #10875: Cargo Train) compatible with older ...
4
votes
0answers
195 views

How do I connect a LEGO wheel to axles so it can be powered?

I have a growing LEGO collection, which I first started with a lot of parts from the generic LEGO Classic 10697. Sometime later, I bought a bunch of wheels, numbers #55981 and #6014. My question is, ...
4
votes
0answers
211 views

Compatibility of maxi sized mega blocks

Maxi-size mega blocks are larger then duplo. As far as I can tell they have 2x the stud pitch and much larger studs. What if-any compatibility is there between the maxi-sized mega blocks and either ...
4
votes
0answers
258 views

Metal Spring for LEGO MOC Simple Suspension

What is the most appropriate dimension (e.g. 20mm x 3.33mm, 5N/mm) of the metal spring for this LEGO MOC Simple Suspension so that it will not cause damage to the LEGO part surrounding it?
4
votes
0answers
308 views

LEGO Technic Interface A

A few days ago, a friend offered me one set 9750 LEGO Technic Interface A with the Interface Card and Cable (IBM compatible) but without software. Can someone share the installation software (LEGO ...
4
votes
0answers
440 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
582 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
464 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 ...
3
votes
0answers
32 views

Read power usage and respond when motor is straining

Is there a way to know if the drive wheels are "straining", like when locked up with an opposing bot? This is for a Lego sumo bot using the Lego Mindstorms Education EV3 Core Set (EV3 Large Motor ...
3
votes
0answers
89 views

Capture video stream from LEGO Studio Camera (Logitech USB webcam) in ev3dev?

Once upon a time, LEGO made a digital camera for the LEGO Studios and Mindstorms line. Internally it's an old USB Logitech repackaged in a LEGO housing. It could also be used with the old LEGO ...
3
votes
0answers
84 views

Grey Clone-Brand Brick With a Single Short Tube on the Bottom?

I've had this brick for a while, and I've long wondered what it is. It's a LEGO-compatible 2x4 brick, colored almost exactly the same as the old medium grey. There are no identifying marking, and the ...
3
votes
0answers
75 views

EV3 Brick and Commander app bluetooth disconnecting

On OSX 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
88 views

Alternate builds for classic space sets

I'm looking for a full list of the alternate builds on the boxes of Classic Space. Any ideas?
3
votes
0answers
168 views

Spik3r wheels move but the spik3r itself doesn't

Our Spik3r's wheels move but the Spik3r itself does not move. Please see the picture of the back of the vehicle - is it somehow incorrectly built?
3
votes
0answers
60 views

Are there any Open-Source bricks projects for robotics?

I mean some bricks like Lego/Meccano with a community like Instructables site, those share their models and robots with others. Also the 3D models of bricks(in solidworks format for example) are free ...
3
votes
0answers
125 views

Boosters from set 71214 don't fit

The booster pieces don't fit into their place on Benny's Dimensions set (71214). I'm talking about the bigger booster in the middle. This seems to be a really common problem, but is there a fix?
3
votes
0answers
606 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 ...
3
votes
0answers
640 views

Can I use EV3 with a TETRIX motor?

What program can I use to control a TETRIX motor through the LEGO EV3? I've heard that RobotC currently cannot be used for this. Has NI released a Labview version which I can use to control TETRIX ...
3
votes
0answers
514 views

RCX 1.0 downloaded firmware successfully with RIS 2.0 but does not run any program

I have installed correctly the RIS 2.0 in an old laptop running Windows XP and I successfully downloaded the firmware through the RIS 2.0 to the RCX 1.0, following the standard setup instructions. ...
2
votes
0answers
23 views

Improving EV3 Screen Readability

I often have a hard time reading the EV3’s LCD display. I presume that I’m not the only one who has experienced this issue. Is there a way to improve its readability? For example, are there any good ...
2
votes
0answers
46 views

How to mirror an EV3 motor?

I want to get one EV3 large motor to copy the other. So if I move one half a rotation the other copies.
2
votes
0answers
54 views

Narrow gauge train wheels metal axle?

Anyone know some way, (or someone that makes a mod) to make narrow gauge wheels that actually roll fast? Something similar to the metal axle trucks that are used for standard gauge trains.
2
votes
0answers
62 views

Where is an instruction sheet for Ausini set 25418 guitar?

I bought an Ausini brick set AUS-25418, which is a guitar, however as cheap as it was the price, it didn't have the building instructions, at least it looks like no piece bags or stickers are missing. ...
2
votes
0answers
53 views

How many rotations or degrees do you need to turn your robot?

I have an EV3 Home edition. I have made a tribot. Two main motors for the wheels and a caster in the back. To complete a full turn in place I need to set the rotations to 2.32 or 835 degrees. Does ...
2
votes
0answers
217 views

Lego EV3 simulator and programming

I've been searching and testing for hours. There is little information on this subject though. I have some specific requirements for a Lego EV3 simulator and programming environment. I do not want to ...
2
votes
0answers
71 views

Lego magnet strength

Some questions about these magnets: https://www.bricklink.com/v2/catalog/catalogitem.page?P=73092 I'd like to know roughly how much weight two of those could lift or what force is needed to separate ...
2
votes
0answers
280 views

Is there an leJOS simulator for EV3?

I found this but this seems to be using their own library to control the EV3.
2
votes
0answers
321 views

How can I use the Flex Tool easily on LDD?

On LEGO Digital Design, I find it very hard to move the piece being flexed to the correct position. Are there any tips or musts that I should try to help me flex it into clips etc.?
2
votes
0answers
35 views

NXT Mindstorms software glitch

My FLL team was doing some practice programming exercises this morning. One group wrote a program using color sensors, no issue. The next group opened a new program window and attempted to open a ...
2
votes
0answers
39 views

How can I read NXT logfiles?

I used the logfile feature to collect light intensity values. How can I get a view to this data? On the NXT brick I only found: "delete" or "send" but not "show". I tried "send" when I had an USB ...
2
votes
0answers
233 views

Creating custom blocks using EV3 block developer kit

I am trying to develop a custom block using ev3 block development kit but i get nowhere. I created the XML files according to the documentation and the VIX file but it does not compile, I cannot ...
2
votes
0answers
141 views

Reading NXT Touch Sensor with Monobrick Communication Library

In my program, I need to detect if a touch sensor is activated. Here's some of my code: var nxt = new Brick<Sensor, Sensor, Sensor, Sensor>("usb"); nxt.Connection.Open(); nxt.Sensor1 = new ...
2
votes
0answers
203 views

Unable to turn on NXT. Completely Frozen

I recently downloaded a file on my NXT and when I used it, it didn't work. The motors started to make sounds like they were jammed, one stuck and now it won't even turn on. I tried the reset button ...
2
votes
0answers
1k views

Bluetooth connection to EV3 from Java on Linux/Android

I would like to connect to my EV3 from PC (and then Android) via Bluetooth. I was able to connect to NXT with LEGO-MINDSTORMS-MINDdroid which uses direct LCP commands but as far as I know the ...

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