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Questions tagged [technic]

A more advanced form of LEGO®, allowing for the creation of more realistic working parts.

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3 votes
2 answers
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How to create a "return to steering system" without using LEGO Power Functions for Technic Cars?

I just bought a 42154 Ford GT, and I wanted to make it an RC, but I only have 2 M-motors and an RC receiver. How do I create a return-to-center steering mod for my car?
drEinstein's user avatar
0 votes
0 answers
36 views

How can I connect an external speaker to a Lego NXT? [migrated]

How could I connect an external speaker to an NXT like the one in this video?
sam's user avatar
  • 1
2 votes
1 answer
77 views

Extra liftarm piece included in Airbus Helicopter 42145 set

So I just finished building set 42145 (Airbus Search & Rescue helicopter). In the picture below you see the left-over "extra" pieces. The usual assortment of 1x1 tiles, bushings and ...
Tonny's user avatar
  • 1,284
0 votes
0 answers
63 views

Building set 9396 Rescue Helicopter

I found an old box with set 9396 “Rescue Helicopter”. I have one problem: If I build the two double wheels at the back according to the instructions, they seem stuck and the wheels cannot be lowered. ...
gnasher729's user avatar
5 votes
1 answer
2k views

Why doesn't this Technic bar fit?

Why doesn't this yellow Technic bar fit?
Technic Axlerod's user avatar
3 votes
1 answer
131 views

Bugatti Chiron built and everything worked - now pistons don’t move. What could cause this?

Built the Bugatti Chiron and initially everything worked. With the shifter in "drive" the wheels turned and the pistons moved, in neutral the wheels moved but the pistons didn’t. The reverse ...
Kelvin Cain's user avatar
6 votes
1 answer
774 views

Pieces Differ in Color/Shape from Diagrams and are Missing Lego Writing

Ferrari 488 GTE (42125) is my first Lego technic set and I’ve noticed that some pieces differ in the shade of the red/maybe even the type of plastic and also don’t match the diagrams and pictures from ...
eYe's user avatar
  • 163
5 votes
1 answer
81 views

How to compare 2 custom lists of lego details?

I have a .lxf file for MOC. With Bricklink Studio I can create a list of details for it. In Rebrickable I have a list of all parts that I own. Do we have a way to get somehow a list a details for this ...
NewVisitor's user avatar
0 votes
0 answers
83 views

Error of Control+ calibration test on CAT D11

I've just finished building set 42131 Cat D11 Bulldozer, but unfortunately I couldn't do the final calibration before driving it... I carried out the tests during construction and everything was OK. ...
Nathan Siess's user avatar
0 votes
0 answers
94 views

Caterpillar D11 (set 42131). will not calibrate the blade tilt function

I finished building my LEGO technic CAT D11 set and I tried using the C+ app but the first try It did nothing so I searched and found I accidentally missed a gear and put it in my extra pieces box so ...
LegoGuy5's user avatar
5 votes
1 answer
557 views

Can anyone identify this red LEGO Technic car set from the late 80's/early 90's?

Kit built a jeep or race car. Roughly from the late 80's/early 90's. Car had a rear differential, wishbone suspension and rack and pinion steering. Very similar to http://www.technicopedia.com/8865....
Tom's user avatar
  • 153
1 vote
0 answers
170 views

Lego Control plus doesn't work with Cat D11 Bulldozer (42131)

When I am testing my remote control for the Cat D11 Bulldozer (42131) all features are working except the two motors for the wheels. Also when I am syncing the CONTROL+ app nothing is working. I have ...
Gunter Vanuytrecht's user avatar
1 vote
1 answer
129 views

Can I connect technic hub 88012 to remote 88010 directly? [duplicate]

My seven year old has got the Technic hub and remote, and we were expecting them to pair but they won't. Do we have to pair them via the app or can they pair directly?
Elinor Dixon's user avatar
4 votes
2 answers
1k views

If I put the bushing wavy side the wrong way will it affect my build? (Technic Ferrari car)

I am on step 81 and just realized that the small parts have a wavy and straight side and that I have to put them a certain way, I’m not sure if all of them are the correct order will this affect my ...
Hanna David's user avatar
5 votes
2 answers
127 views

Any other Technic parts with a pinhole slot like part 18940?

I haven't kept up with new parts or sets for at least a decade, but recently when browsing BrickLink I ran into part 18940: This caught my attention as I'm working on a MOC project right now where a ...
PGmath's user avatar
  • 444
4 votes
1 answer
114 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 ...
ShyPlatypus 's user avatar
5 votes
1 answer
138 views

How to find this LEGO part name? For connection of Technic bricks and steering liftarms

I have checked Bricklink for Lego Technic but still can't find it's name.
NewVisitor's user avatar
0 votes
0 answers
215 views

Cat D11 Bulldozer (42131) set's calibration always reset

Calibration of my Cat D11 Bulldozer went without any issues. Everything worked fine. The problem came after. When I disconnect, either by Bluetooth or manually, the calibration data went out the ...
jerry's user avatar
  • 1
0 votes
0 answers
39 views

Software for designing your Lego Technic builds [duplicate]

Is there a software for designing Lego Technic builds? That way I would know which parts I really need to buy.
leonicolas's user avatar
-2 votes
1 answer
176 views

Where can I find the assembly instructions of the chinese Ferrari Daytona gold/black variant?

I bought on Aliexpress a Ferrari Daytona, 1:1 compatible with the original LEGO set, but it's the black/gold variant. I didn't receive the book, as expected, but I was unaware that the set has no PDF ...
realtebo's user avatar
0 votes
0 answers
225 views

Cat D11 calibration starts then stalls

My Cat D11 lego worked perfectly a few months then it stopped having full range of movements (blade, rear ripper, stairs) but still drives ok. When I try to calibrate, it starts the process but then ...
Tiago's user avatar
  • 1
1 vote
2 answers
970 views

Calibration Freeze on D11

I've read through similar posts, but haven't seen exactly the same issue. Built it once, and froze during several calibration attempts. Stripped it all down, rebuilt it very carefully and still have ...
Ozzy's user avatar
  • 11
7 votes
1 answer
1k views

What is this yellow bulldozer set?

In the research field of neural radiance fields, you frequently find the following yellow LEGO bulldozer, and I assume it a set. (Searching for "neural radiance fields bulldozer" will ...
flawr's user avatar
  • 173
3 votes
2 answers
369 views

Size of packaging of Battery Box 88015

I am interested in the dimensions of the packaging of this product. I am able to find only the dimensions of the battery box itself, but not the box.
Humphrey Appleby's user avatar
4 votes
2 answers
278 views

Does LEGO make a electronically controlled pneumatic valve bank?

I've decided to try my hand at building a working LEGO Concrete Block Making Machine, as shown in this picture: with the idea being that the machine will be controlled by both manual and automatic ...
GipsyD's user avatar
  • 503
3 votes
1 answer
136 views

Lego 42082 Rough Terrain Crane superstructure does not rotate easily when master selector is set to neutral

My son has been building the Lego 42082 crane and is on bag 9. I don't believe the central section is functioning properly as I believe the rings should turn much more easily by hand than ours does. ...
James's user avatar
  • 31
2 votes
0 answers
177 views

D11 Test mid build

On step 198 of D11 Technic set the instruction asks you to test the gears. When I test it, the gear switches but never runs the test to spin the right gear. It does that on each gear it tests. I ...
Krys's user avatar
  • 21
2 votes
2 answers
164 views

Alternative to LEGO Education for Technic parts?

I am trying to work through the LEGO Education platform, however am stuck at where to buy a big set of gears and similar from. There are sets of 50pcs for $40+, which is clearly a ripoff. Or 500 ...
Oran Matheus's user avatar
0 votes
1 answer
136 views

Cat D11 bulldozer - should the plough and the frame be connected?

I’ve completed this and now have some remedial work to do! Can I please check though, are the two parts at the back (the ‘plough’ and the ‘frame’ with the ‘pistons’ on) supposed to be connected in any ...
John Everett's user avatar
0 votes
1 answer
193 views

Rotating and elevating platform

I want to build a platform that can be raised and lowered but also rotate at the same time. Tried scissors and linear actuator, etc. and other techniques but cannot figure out a way to raise and ...
Ken Lee's user avatar
2 votes
2 answers
348 views

What is this part? Grey, 3 studs long, with two pins and an axle hole [duplicate]

Grey Lego piece. Says LEGO inside piece, but no ID number. Thank you!
Charissa Fitzpatrick's user avatar
3 votes
1 answer
605 views

Correct axle rotation of partially built LEGO Cat D11 Bulldozer (42131)?

Page 173, Step 205, of LEGO Cat D11 Bulldozer (42131) instructions has a step to attach two sub-assemblies. What is the correct rotation of these two axles? Is it correct if they rotate in opposite ...
francis's user avatar
  • 41
1 vote
0 answers
92 views

App-Controlled Cat® D11 Bulldozer

I'm having a problem with the App-Controlled Cat® D11 Bulldozer (42131). The option Module 2 test has disappeared from the app. How do I get it back?
francis's user avatar
  • 41
3 votes
2 answers
778 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 ...
Duy Vuong Quang's user avatar
3 votes
1 answer
205 views

Please identify this green pin

I bought the 42153 set yesterday and I got this green rare pin in bag 1. How can this Technic pin be used?
LKBricks's user avatar
  • 897
8 votes
1 answer
261 views

Extend/retract speed of linear actuators

I am trying to find out if the linear actuators (small, large and XL) have a fixed number of rotations on the bottom axle connector in order to extend them fully? I am guessing the small LA will take ...
maxos79 Mouse's user avatar
2 votes
1 answer
130 views

Lego 42129 automatic suspension lift

Has anyone looked at a mod to lower the suspension on the LEGO 42129 4x4 Mercedes-Benz trail truck when the differential lock activates. I was thinking about a few linear Actuators but never had a set ...
maxos79 Mouse's user avatar
2 votes
2 answers
252 views

Is it possible to control Airbus H175 Rescue Helicopter 42145 via the app?

Has anyone used a Technic Hub 88012 and not the Powered Up battery box that comes with the set? I would love to get it controlled via the app.
maxos79 Mouse's user avatar
3 votes
1 answer
333 views

How do I switch out a gear in the Cat D11 set without taking the set apart?

I have a fully completed Cat D11. Great build. (I have previously built the Bucket Wheel Excavator, the Rough Terrain Crane, Liebherr 9800, Airbus 175, etc.) Couldn't get through calibration. Did not ...
Jack's user avatar
  • 31
12 votes
1 answer
2k views

Why are there many hidden holes in 'Monkie Kid’s Team Van' 80038?

Lego set 80038, 'Monkie Kid’s Team Van', repeatedly uses yellow Technic Brick 1 x 1 with Hole (item 654124) where it could simply use a standard 1 X 1 brick (item 300524). For instance, in Instruction ...
Roberto Tyley's user avatar
-1 votes
4 answers
229 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 ...
Duy Vuong Quang's user avatar
3 votes
1 answer
192 views

Lego 88012 hub socket type

The LEGO Technic hub 88012 has 4 sockets. Can anyone tell me what the socket types are? I have tried to find out via LEGO Support and they directed me to this site. I have searched the internet and ...
Neil S's user avatar
  • 31
5 votes
1 answer
192 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. ...
SeismicVibrations's user avatar
6 votes
2 answers
2k views

Can one connect two technic pins end-to-end?

Who hasn't tried following some MOC instructions only to discover problems? This TIE Outlander build (free instructions) is neat but has several issues, the biggest of which are steps 44-46. The ...
Taejang's user avatar
  • 171
4 votes
1 answer
320 views

Is there a Good Replacement M Motor?

I teach robotics with technic parts and M motors. The motors I have bought on Ebay burn out quickly and fit axles poorly (either too tight or too loose). It is difficult to teach when students' motors ...
Legomarty's user avatar
2 votes
1 answer
139 views

In the Ferrari 42143 build at Stage 85 should the yellow assembly be loose?

I have gone beyond step 85 but the yellow assembly installed then is still loose, not connected to anything and can be pulled out. I want to make sure this is right as I do not want to go much further ...
Mike P's user avatar
  • 523
6 votes
2 answers
2k views

Error correction after building the D11

I just finished the D11 bulldozer. The last LEGO set I built was 55 years ago, now I got this big machine and I really enjoy it! But I have troubles with the the calibration and I think the failure is ...
Jeeplego's user avatar
  • 141
7 votes
1 answer
533 views

What's inside a linear actuator?

The two linear actuators that I know, 61927c01 Linear Actuator and 92693c01 Linear Actuator Mini, have a built-in clutch (that makes a clicking sound when feeding the actuator torque when it's fully ...
IvanSanchez's user avatar
  • 8,734
2 votes
1 answer
217 views

Lego D11 ripper cylinder

I'm building the Lego set 42131 D11 bulldozer and my back ripper cylinders (linear actuators) are in the complete up position and it's keeping me from completing the build. How do you get them to go ...
Daniel Jones's user avatar
1 vote
0 answers
288 views

Problems with the main rotor speed in Airbus H175 (42145) set?

I'm having problems with the main rotor in "slow" position. The speed stays the same no matter what position the joystick is in. On the other hand, in "fast" position the blades ...
declan johnson's user avatar

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