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Questions tagged [technic]

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

4
votes
1answer
68 views

Which set is this slope with holes from?

I picked up a bag of loose LEGO at a thrift shop and cannot identify which set this piece comes from: The holes pass all the way through the slope but have small details inside that prevent a ...
3
votes
2answers
37 views

Need advice re Power Functions

My 11-year old son wants to add power to his creations but neither of us know quite how to start this new adventure. He doesn't have any Technic or Mindstorms sets. Looking through sets online, it ...
4
votes
0answers
36 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)...
7
votes
1answer
94 views

What is the three-position lever in the Bugatti Chiron supposed to do?

I've just finished assembling the Bugatti Chiron (42083), and there's a three-position lever in between the two seats that -- probably -- isn't working: one position connects the wheels to the engine; ...
3
votes
2answers
71 views

What does each part do exactly?

It's been a few years since I bought a Lego Mindstorms (v2) which comes with the technic style pieces. There's beams, axels, rods, connectors... but the majority of the times when I'm building (my ...
0
votes
1answer
28 views

Problem With Bionicle Joint Sockets

I'm pretty sure that serious Bionicle fans have all dealt with cracking of the joint socket pieces. However, is super-gluing the broken parts a solution? I'm worried that the joint socket won't be ...
7
votes
1answer
862 views

9398 the front wheels rotate in the opposite direction to the rear wheel

We've just finished 9398 4x4 Crawler. Everything looks good, the motors work but the front wheels rotate in the opposite direction to the rear wheels, they also turn in opposite directions. What could ...
0
votes
1answer
77 views

My Lego Technic 42082 wheel stuck and can't move [closed]

After I finished my 1st manual book, I found out that my crane wheel can't move. May I know which part that I did incorrectly?
5
votes
2answers
108 views

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

Due to the way all the modern LEGO gears are perfectly quarter-turn symmetrical, there doesn't appear to be any way to assembly 2 opposing gears such that I get a 2 perfectly parallel axles. This ...
9
votes
3answers
119 views

What's the best way to start an 8 year old on Lego Technic building?

I'm a grandpa trying to start my 8 year old grandson in LEGO Technic building. I am particularly interested in mechanical parts building and motorization. He already loves LEGO and attends after ...
4
votes
2answers
89 views

What are some good purist rotacaster / omni wheel designs?

In robotics, rotacasters or omni wheels are often very useful. It's possible to buy LEGO-compatible ones from some third parties, here's one random example: Unfortunately, LEGO has yet to make any ...
11
votes
1answer
104 views

How To Sort Out 3rd Party Technic Clones From LEGO Originals?

I've recently bought bulk parts, and wish to sort out the official LEGO pieces from the inferior quality 3rd party clones. On bricks I can easily spot-out the clones, becasue they don't sport the "...
12
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0answers
125 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/...
2
votes
1answer
992 views

Adding Power Functions to LEGO Mack Anthem Truck (42078)

Does anyone have experience adding Power Functions to set #42078 LEGO Mack Anthem truck? It’s a Technic set, but only features manually actuated functions. I have seen it motorized on YouTube, ...
4
votes
1answer
89 views

Technic bits set

There are LEGO sets containing just a selection of bricks, such as 10717. Are there Technic equivalents with cogs and so-on? If not, what is the best way to acquire a general selection of cogs/axles/...
8
votes
2answers
105 views

Smallest rubber wheel that can be turned by a technic axle

What the smallest rubber wheels that can be turned by a Technic axle? This is what I have so far Wheel Full Rubber Balloon with Axle hole #4288 Background: I'm building a GBC and I want to push the ...
1
vote
1answer
325 views

How to MOC the Rough Terrain Crane 42082

I recently got me the Rough Terrain Crane 42082 and had lots of fun while assembling it. I find it a decent Technic build and worth the price. Still I find it under-motorized. I would like to drive ...
9
votes
2answers
391 views

Identifying Parts Used For The Escape Hatch of Sariel's Tiger XL Model

I am working on a similar model of Sariel's Tiger XL in prep for my own designs of a few other German WW2 tanks, and need some help identifying a part or two. Does anyone know what are the two parts ...
5
votes
1answer
196 views

Pattern for oscillation with LEGO Technic

I would like to simulate an oscillation movement of 120/100 degrees around a fixed point. Something like this one: Basically, I want to rotate a gear around its axis, but only have a partial ...
7
votes
1answer
106 views

Stuck on 42066 Air Race Jet model B

I've successfully built model A of the Air Race Jet but with model B I've got stuck on page 7, instruction 8. How do you do that?
7
votes
1answer
126 views

How can I firmly attach a triangle to a turntable?

I found a couple good technic triangle designs over on brickengineer.com. For example: How can I firmly attach a triangle to a large turntable? Details: Really I only need to attach ...
5
votes
1answer
102 views

Does LEGO Digital Designer include part 4539880?

Does anyone know if LEGO Digital Designer includes the part 4539880 (often used for housing differentials) ?
2
votes
1answer
200 views

Confused about power functions motors 8883 and 8293

Is the motor that comes with the Technic power functions motor set (8293) and the stand alone motor 8883 the same? We have just built the LEGO Creator 10261 roller coaster set and it specifies a 8883 ...
3
votes
1answer
92 views

LEGO part counts on boxes without treads

I want to buy another LEGO Technic set therefore I'm trying to analyze the challenge to price ratio of different sets. I first thought that the part count may be somewhat proportional to challenge and ...
3
votes
2answers
89 views

Repairing disintegrated old 9V wire

I have a number of old technic motors and battery boxes I would like to use however the wires have disintegrated in storage to the point that the metal conductors touch and short out. Does anybody ...
11
votes
1answer
5k views

How can I motorize 42077 Technic Rally Car with LEGO Power Functions?

The new 42077 Technic Rally Car set looks really nice, and even has a built-in steering system which can be controlled by a gear on the top. There's also a fair bit of extra room inside, is there a ...
4
votes
1answer
144 views

What part(s) can I use to connect technic liftarms with modules?

I have the following setup: How can I connect the liftarm to the stacked bricks? The holes have different distances, so I can't just use black pins. Any suggestions?
5
votes
1answer
363 views

Fan door does not close completely - Air Race Jet

After completing the Air Race Jet, I found that the upper fan door does not close completely (stopping short by about 1/2 inches) when I switch from VTOL to Flight mode. The attachment points to the ...
1
vote
1answer
68 views

What is the appropriate way to request a creator to add more of their designs to mochub?

There are some brilliant LEGO creators with many designs on YouTube out there who choose to remain anonymous- who put some of their designs on mochub but not others. (In particular ones relating to ...
1
vote
1answer
105 views

Problem assembling wings as shown for LEGO Air Race Jet (Technic 42066)

On Page 158 (Step #231) of the assembly instructions for the Air Race Jet, two red rivet bricks are shown being inserted into a wing. But the pieces in question will simply fall through the holes in ...
11
votes
1answer
162 views

High Torque Subtractors

I would like to use a subtractor in my next RC LEGO tank, as it enables the vehicle to turn on the move, as opposed to stopping and then turning. Unfortunately, the subtractors I have tested so far ...
4
votes
1answer
441 views

Is there any software for designing and testing Technic mechanisms?

I'm finding Technic parts can be challenging sometimes, and the costs can be high. Is there any 3d design software that can help with designing before I decide to buy the parts?
4
votes
2answers
94 views

What about Power Functions motor, S size?

LEGO Power Functions has motors in M, L and XL sizes. Usually, if someone uses this size designations, the smallest one is S. It would make sense to have them named S, M and L if there were meant to ...
3
votes
1answer
434 views

Is there a list of the most common Lego Technic parts?

I searched the internet for this and I found a list of complete sets. But I am looking for a list of the most common (and in some sense the most important or most helpful) individual Lego Technic ...
4
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0answers
147 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, ...
2
votes
1answer
96 views

Two separate functions of 5282 remote?

Given the RC set of 5282 and 6272c01 below: Is there a solution to use the two paddles that command the auxiliary output of the receiver for different functions? For reference, see this at 1:45. ...
7
votes
1answer
118 views

Can I still motorize Universal Building Set 8034 and other from that time?

Set 8034 was supposed to be motorized using 8700. Of course, this is way outdated and kinda pointless to buy motor this old. Current set for this purpose is 8293. Problem is, old motor was 5 studs ...
2
votes
1answer
146 views

Is 32013 a drop-in replacement for 3651?

In my old sets there are many 3651 parts that are broken. As far as I remember, these sets do not use studs on the piece. Per this answer, new piece with the same function is 32013: Can I just buy ...
3
votes
2answers
201 views

My 9398 crawler going in reverse way

I built 9398 crawler set and everything seemed OK. However, when I moved the RC tumbler up, the crawler went back, and when I moved it down, the crawler went forward. On the battery box I saw ...
6
votes
1answer
164 views

LEGO twin-engine airplane (black/yellow/grey) set identification please

Bought this airplane "as is" at a flea market. Pieces missing. I want to repair it. Does anyone here have the LEGO set number or know where I can find the instructions ? I suspect that it is several ...
5
votes
2answers
141 views

Technic Pin/Travis Brick Legal Connection?

Is seating a Travis brick on a Technic pin a legal connection? TLG has used this construction at least once (M-Tron Particular Ionizer's "rotor"), but that was in the early 90s. Will this connection ...
5
votes
1answer
193 views

Is it legal to sell a custom element that provides a Technic pin connection?

I'm wondering if it would be legal to produce a custom piece for Lego Technic and sell it? The piece features 4 compatible connection holes for Technic pins. From what I've researched in the Lego ...
7
votes
2answers
114 views

How do you make a triggered counted ball drop?

Is there any solution on making a drop of a counted number of balls when one ball passes through the system? For example: One ball falls into a hole on the top and ten balls (plus/minus (not ...
2
votes
3answers
307 views

Bucket Wheel Excavator not powering up?

I just finished to assemble the Bucket Wheel Excavator (42055) set, I inserted new batteries in the battery box and tried to power it up. The led on the battery box blinks for a millisecond almost ...
2
votes
2answers
197 views

How do people build large collections of bricks?

How have people built up such large collections of bricks? I would like to get into building Lego Great Ball Contraption modules, but this needs a lot of parts to play with. I've got some Lego from (...
0
votes
0answers
153 views

How can I combine multiple PF XL Motors [duplicate]

I have built an enormous and heavy Lego RC tank, driven by 2 XL Motors, connected to a subtractor, one motor is for steering, the other is for propulsion. Despite having already geared down the motors ...
1
vote
1answer
287 views

Lego Technic 42048 with Lego 8293

I have seen a YouTube Video that claims the motorization of Lego Technic 42048 using Lego 8293. However, the Lego support site does not state such compatibility. I am not able to get my hands on a ...
4
votes
1answer
597 views

Which Lego Technic sets are officially combinable?

Lego sets 42058 and 42059 can be combined together to build a bigger truck. We can find official instruction on the LEGO site. Are there other pairs (or larger groups) of sets like that? I am ...
6
votes
1answer
164 views

Do all technic bushes (3713) have the LEGO label on them?

I have just found out that many of my Technic bushes (3713) do not have "LEGO" printed on them. Does this mean they are fake? I know that many parts were produced in several variations.
10
votes
1answer
3k views

What are the dimensions of a technic axle?

I'm working on a LEGO compatible motor system that will be largely 3D printed. I want the connectors to fit standard LEGO axles, but I haven't been able to find the dimensions online, and I don't ...