Questions tagged [technic]

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

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Lego XOR gate WITHOUT else gates [closed]

Is it possible to try to make an XOR gate with LEGO without using other logic gates? And if it is possible can you tell me how to build it?
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2 votes
0 answers
87 views

Black Universal Joints

I'm seeking black universal joints for a project. Do these exist in genuine LEGO form? I'm guessing the answer is no, despite hints (here and here). Ideally, I'd like the 3L size. Do you know of a ...
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5 votes
1 answer
441 views

42082 crane boom doesn't engage

At the top of the sleeve part of the boom is a gear and that is supposed to turn against a rack of teeth all along the inner slide part of the boom extension, to make the boom longer or shorter. ...
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  • 231
4 votes
1 answer
138 views

Lego rough terrain 42082, page 57 book 1 - how does it connect internally

Is the dole meant to connect to another cog inside so all the gears rotate the big round cog on top (Image from brickinstructions.com)
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7 votes
1 answer
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What's the easiest way to build a delta robot using LEGO Mindstorms 51515?

I'm fairly new to Lego Mindstorms and I'd like to assemble a pick and place mechanism. I was looking for existing delta robot designs and found a lot of good looking designs: https://www.youtube.com/...
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5 votes
0 answers
271 views

How do I build my LEGO slope so it connects to the flat top without any notable ridges?

I'm currently building a functional LEGO escalator that is minifigure-scaled and with staircases transitioning from flat platform to stairwell to flat platform. Here's my progress so far: Here's the ...
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3 votes
1 answer
234 views

Piece in Lego 21327 Typewriter Step 26 can’t be flush as depicted in the illustration

When sliding part #6327028 down the left three rods as depicted in step 26, that piece becomes snug with the gray spacer piece from Step 25, but there’s a gap on the two left rods. The 1x5 black ...
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16 votes
2 answers
2k views

How can I place a motor in the middle of a Technic beam with an odd number of holes?

Can you give me some advice how to make it so motor will be in the middle, but at the same time keep the functionality of the 2 axles on the sides? It can go further up if necessary.
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10 votes
0 answers
190 views

How To Ensure Only One Brick is Fed Into a Lego Sorting Machine at a Time?

In this video, they create a machine that can take a bunch of legos put on to a conveyor belt and, using a camera, sort them into a number of categories. I am building a (smaller) version of this, and ...
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3 votes
1 answer
607 views

Identify this T-shaped part

Seems to be used for making differential gearboxes, cars, and GBCs.
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  • 139
7 votes
1 answer
461 views

What is this LEGO part number? Technic, right angle with 4 pins sticking out

This part is required for building a LEGO steering rack. It connects the moving rack to the wheel axle.
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  • 139
-1 votes
3 answers
240 views

Why does this "useless machine" use out of production parts?

I found this new video. It uses out-of-production parts like the transmission parts. So when I tried to buy these elements in new Technic sets, I didn't find some of them. Any suggestions please?
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  • 194
18 votes
4 answers
2k views

How can I get my motor to line up with a linear actuator?

I am very new to Lego, and I want to create a simple horizontal sliding door. I'm using a medium linear motor to drive a linear actuator which is attached to the door. The problem is the motor does ...
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  • 181
0 votes
0 answers
38 views

I can't build gear on Digital Desinger [duplicate]

I'm new to this program and I can't put a gear in place. I'm trying to build a worm gear but it doesn't work.
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1 vote
0 answers
156 views

Are Technic and Education sets overpriced because they're "educational"?

It seems like to get a Technic set of any substantial size costs hundreds of dollars. It's kind of insane. Technic is marketed as "educational". Sometimes I wonder if The LEGO Group is ...
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  • 353
8 votes
1 answer
362 views

Does a LEGO Technic Power Functions L Motor work with a v1 receiver?

Does a LEGO Technic Power Functions L Motor work with a v1 receiver? I really want to know it, because then I know what motor I should buy.
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8 votes
1 answer
1k views

Identify an unusual double-ended ball socket link part

This part is made up of three pieces - two identical ball socket ends that fit the standard tow ball size, and a thin rod connecting the two that is freely rotating. This allows the two ends to rotate ...
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  • 183
5 votes
1 answer
438 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 rear axle/wheels. The rear brake calipers fall ...
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7 votes
1 answer
507 views

How do I build this robot car?

I want to start using more LEGO Technic, but I'm not sure what the best way is to buy the parts without breaking the bank. I'd really like to make a robot like the ones shown in this video. Making ...
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  • 203
2 votes
1 answer
245 views

How to fix the Lego Technic RC Stunt Racer (42095) set's turning drift?

I just finished the Lego 42095 Stunt Racer and noticed that there is a slight drift to the right when it drives forward. It works fine in reverse mode - reverses in a straight line. Any suggestions, ...
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  • 21
8 votes
2 answers
2k views

Insert a gear into a turntable?

Is there a way to insert a 24 tooth gear into a turntable of the 48452cx1 type? --> Is there any model to feature any tooth gear (even smaller) used inside this turntable? This specific ...
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  • 503
9 votes
2 answers
491 views

How can I build a Lego slope of this exact angle with ideally only legal techniques?

I'm currently building a functional Lego escalator that is minifigure-scaled and with staircases transitioning from flat platform to stairwell. Here's my progress so far: But with the design of the ...
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5 votes
1 answer
150 views

Live axle + steering

Does anyone know how to make a live front axle (steered, driven, beam axle, preferably with a panhard rod) in a relatively small space, I can't figure it out. This is my rear axle for guidance: Most ...
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3 votes
1 answer
1k views

Caterpilar D11 (set 42131). Control+ app doesn't seem to work

I just finished my build of the Caterpillar bulldozer D11 (set 42131) and I'm NOT able to operate it with the Control+ app on my iPhone. First the calibrate process begins: Step 1 in that is to move ...
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  • 966
2 votes
1 answer
187 views

What is this Bionicle-looking set?

Can anyone identify this set? Apparently my father has a bunch of these, and he's trying to figure out what to list on ebay. It appears to be at least Lego / Technic compatible, but I don't know much ...
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4 votes
1 answer
131 views

Looking for a big set of tires and rims for my monster truck - really beefy tires

I'm looking for big beefy tires and rims for my large Technic monster truck. I also need something for off-roading.
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4 votes
1 answer
381 views

Motorizing Crocodile Locomotive set 10277 - are there any sets that include hub & motor I need?

Crocodile Locomotive can be powered up by using 1 x 88009 and 1 x 88013. Reviews on hubs and motors strongly suggest it is better, financially, to buy them as part of the sets, not separately. Is ...
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3 votes
1 answer
140 views

Gearing problem

I have a technic MOC with lots of gears which runs fine when motorized with the Control+ L motor, the motor itself attached to the "dumb" battery box that would have been included with the ...
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0 votes
0 answers
121 views

How to increase the voltage supplying to technic motor through the Technic hub?

I have four technic Large motor, all connected to a technic hub. I am using the motor to turn some large propellers and the hub is powered by six 1.5 V (maybe less) batteries. So each motor would get ...
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  • 207
5 votes
1 answer
644 views

Control Lego Technic Control+ Hub via Python

Is it possible to control the Lego Technic Control+ Hub with Python? I have tried using Pybricks but that didn't work well for me.
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4 votes
2 answers
338 views

Motorized Excavator (8043) set alternatives

I'm on the search for a motorised excavator set and have the 8043 in mind. It is now retired and no longer available. Are there any alternative currently available sets? I have looked at a few options ...
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7 votes
1 answer
162 views

Reinforcing a pair of Bent Double 11.5 Liftarms under Rotational Tension

I purchased a clone MOC out of interest a few months back, this following set. Because it does use clone pieces, I knew there was a high chance of breakage and poor fit, especially in the tensegrity ...
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  • 173
3 votes
2 answers
159 views

Most cost efficient length for pneumatic hoses?

As the title says, I would like to know what the most cost efficient length of pneumatic hose (including 99021s) is, assuming the average length of each piece is 12cm (4.7") and I can cut large ...
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4 votes
1 answer
665 views

Can anyone identify these parts? Technic, liftarm connected to a circle

I'm trying to follow a video MOC tutorial but I can't figure out what this brick is. Part number would help.
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6 votes
2 answers
446 views

Volvo Articulated Hauler (42114) doesn't operate the bucket

I cannot get the rams to lift or lower the tipper body. I suspect it has something to do with the clutch mechanism since all the shafts and gears rotate freely until the clutch is connected. The white ...
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  • 61
3 votes
0 answers
363 views

Soft rear suspension on Landrover Defender too low [closed]

Can't answer this officially because I haven't enough points but the photos on the only other answer are of the front end, the problem I had on the rear was that the bottom shock absorber brown ...
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6 votes
1 answer
459 views

Any build instructions for vertical Technic/Lego conveyor belts?

I'm trying to figure out how to continuously lift a stream of incoming pieces up vertically, at least 10cm. This is my first real custom build attempt, so I'm very much at a loss on how to go about it....
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5 votes
1 answer
905 views

I found these images of parts and want to find their part numbers

So I found this lot on the internet but don't trust the seller. What I want to do is find the part numbers of the pieces on the image and buy it from a reliable source. I tried to find it in multiple ...
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1 vote
0 answers
58 views

42082 Rough terrain crane [duplicate]

Crane can not be pushed forward or backward. It seems the front and back wheels want to move in different directions.I the rear wheels are lifted off the ground crane can be moved forward and backward ...
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2 votes
1 answer
132 views

Lego bags missing sets

I have some Lego bags that I do not know which set they belong to. Can you guys help me?
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4 votes
2 answers
308 views

What 3D modelling services could I use to create custom LEGO pieces?

I want to create some custom LEGO Technic pieces, but I can't seem to find any software that is good at making it. I have tried using Blender, but it is hard to create holes. Do you have any ...
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4 votes
1 answer
230 views

How would one parametrically create a LEGO-compatible gear?

If a gear was intended to smoothly mesh with standard LEGO gears, how should it be defined? While I know that the mean diameter (average of inner and outer diameters) of a LEGO gear should be 1mm/...
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3 votes
1 answer
292 views

Technic Rough Terrain Crane (42082) doesn't move

After first book, crane won't roll if pushed. If this normal. I know when you free soon one wheel, the other will go opposite direction, but when I try to spin all four in one direction, it locks. It ...
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10 votes
2 answers
386 views

What's the purpose of 46834 & 46835 pieces (two wheels clutched into each other)

There is this strange wheel-like piece consisting of two pieces snapping into each other and offering to insert both axles from both sides, as shown in the first image. What is the purpose of this ...
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  • 203
1 vote
0 answers
106 views

Technic 4x4 crawler questions

I have the Technic 4x4 Crawler 9398 fully assembled and in working order, but the rear U-Joint sheared itself in half during normal use. I have a replacement piece but now I can’t get the wheels to ...
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  • 11
7 votes
2 answers
646 views

Connecting an axle to a stud on the ground for railings

I'm trying to build railing using axles and connectors and am not finding an easy way to get the axles that go to the ground to connect in a way that would be best for my design. Three options I've ...
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  • 173
4 votes
1 answer
936 views

What is the Bluetooth PIN for the LEGO train PUP remote (88010)

I'd like to use the Powered Up train remote, #88010 as a simple controller (bang-bang only, obviously). It's Bluetooth, and it shows up as a device, but the PINs 0000 and 1234 don't appear to work. ...
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2 votes
0 answers
113 views

Operating first time my 42082 set [closed]

I completed building the 42082 Rough Terrain Crane set and just found out that the boom does not work and the rear spread legs do not fold out, just the front ones.
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7 votes
0 answers
131 views

Oil for old 4.5V motor? (UK)

I've just got my old LEGO Technic motor from my 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-ONE ...
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  • 171
12 votes
1 answer
2k views

Motorized speedboat from Technic Catamaran alternate model?

The alternate model for the 42105 Technic Catamaran set looks a lot like a remote-controlled speedboat. This set doesn't actually come with any motors, or even propellers, so obviously this model isn'...
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