Questions tagged [technic]

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

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6 views

42131 Bulldozer

Got to the testing page and everything is working correctly except the left wheel is going in the opposite direction to the app animation. I don’t know if I should start again?
9 votes
3 answers
6k views

How to run "Power Functions" devices from an electric wall plug?

In this video showing an example of Great Ball Contraption (GBC), we can see (at 1:35) that some trains powers are used to run Power Functions motors: That must be more convenient than having to ...
7 votes
3 answers
141 views

How to open first version of the pneumatic cylinder? (Part no 4688c01)

I have a Lego Technic set 8040 from 1984 with the first version of the pneumatic cylinder. Unfortunately, the shaft on the cylinder broke. Apparently the top of the cylinder (lid) is glued. Is there a ...
0 votes
0 answers
49 views

How do I disassemble Powered Up Motor XL? [duplicate]

My question is, how do you take the XL motor apart? I tried with my knife and hands, but unfortunately, it is still whole in one piece (tabs). I got the XL motor from the set 42099 and I would to make ...
0 votes
1 answer
76 views

42114 (6x6 Volvo Articulated Hauler) doesn’t operate bucket and also doesn’t drive

My 42114: 6x6 Volvo Articulated Hauler drives in first gear for a moment, then stops completely; same thing with 2nd and 3rd gear. It doesn’t operate the bucket either. I suspect I forgot to add a pin ...
4 votes
1 answer
184 views

I am building the LEGO 42131 D11 dozer and some of the parts are moving in reverse when testing

I am building the D11 dozer and some of the tests like 2 and 4 are moving the parts in the opposite direction that they are supposed to be going. I took apart the entire build and rebuilt it and the ...
3 votes
1 answer
448 views

Gearbox doesn’t move when it’s in neutral - Is that normal?

I’m not sure if the gearbox is supposed to move when it’s in neutral but the gearbox only moves when it’s in drive or rear. If I made an error can someone please tell me if there is a way to fix it?
2 votes
0 answers
71 views

I just finished the typewriter set and everything works fine but the type-bar is a little higher than it should be. Is there any way of fixing it [closed]

The typewriter works perfectly fine. The only problem is the typebar being a little higher than it should be.
3 votes
1 answer
255 views

Technic pin on a pole: is it an illegal technique?

I have two 2714b pieces that I want to put together to make a longer pole. Is sliding the technic pin of one pole over the end of another pole illegal? (If it is, how else could I make a long and thin ...
8 votes
1 answer
769 views

Extra wing pieces (21+22) in Ferrari Daytona 42143. Did I miss a step or did Lego get it wrong?

The Ferrari Daytona SP3 (42143) is supposed to have 10x 6319983 (small wing #22) and 11x 6316923 (small wing #21), both in black. It says so on the part-list and they are in the box. However I have 1 ...
7 votes
2 answers
246 views

A query about the balance of the 42130 - BMW M 1000 RR model

I have reached assembly step 632. The bike has a tendency to lean forward with most of the weight at the front, and is only just staying on the display stand. Has anyone else experienced this issue? ...
6 votes
2 answers
169 views

How can I connect a 4mm Stepper motor shaft to a technic gear?

How can I connect a 4mm or 6mm stepper motor D shaft to an old Technic gear? I would like to mount an old 8-tooth gear to a 4-6 mm diameter stepper motor shaft. Lego part: 3647: Stepper motor: ...
1 vote
0 answers
72 views

Power from single XL-Motor to both rear and front axles [closed]

I have a single XL motor and I would like to make my small car a 4WD one. Currently, it is just front-wheel drive. Any good instructions on transmitting power to rear wheels as well?
5 votes
1 answer
217 views

I would like to check on a step in the BMW M 1000 RR build

A bit of a silly question here really but I am assuming the three decals in step 523 are simply three different options you can choose from for that piece ?
13 votes
1 answer
1k views

Mechanical auto-unblocking mechanism

I have a GBC module1 which is quite simple but blocks regularly because a ball happens to be at just the wrong place at the wrong moment. Per se, it's not a problem as a Technic Gear 24 Tooth Clutch ...
2 votes
1 answer
131 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 ...
7 votes
0 answers
156 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 ...
16 votes
1 answer
930 views

How much tension can I expect to get out of a LEGO chains 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 16-tooth gear to directly drive a 24-...
2 votes
1 answer
270 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, ...
12 votes
4 answers
1k views

2:1 gear ratio in stud-less Lego Technic

Is there a recognised technique to create a 2:1 gear ratio in stud-less Lego Technic? Neither of the two methods suggested here (studded though) work. 24T/12T with a 2L x 1L axle offset does rotate, ...
7 votes
2 answers
868 views

How can I improve my rackless steering design?

I am trying to build a vehicle with a sturdy steering mechanism powered by the servo motor. When I was a kid I did this all the time with a rack and pinion design, but now I don't have any of the rack ...
4 votes
1 answer
387 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 ...
5 votes
1 answer
466 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. ...
4 votes
1 answer
153 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)
5 votes
1 answer
321 views

How deep can the axle go in the Powered Up L motor?

I am trying to make a MOC but I can't decide how long the axle could be so it can go fully into the motor but not extending out of the other side. Could you tell me how long the axle can go in?
0 votes
0 answers
334 views

The Powered Up app won't connect to my Technic Hub

I have recently bought a Technic Hub and four Powered Up L motors, but currently I only put two motors into the B and D ports of the hub. I downloaded the Powered Up app to a tablet and used the "...
8 votes
1 answer
2k views

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/...
5 votes
0 answers
301 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 ...
3 votes
1 answer
2k 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 ...
9 votes
2 answers
563 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 ...
3 votes
1 answer
277 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 ...
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.
10 votes
0 answers
211 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 ...
16 votes
1 answer
5k views

Realistic Lego car sets containing gearboxes and engines?

Lego Technic 853/956 Auto Chassis contains a car chassis, complete with a transmission gearbox. Other sets like Lego Technic 858/8858 Auto Engines contain parts to build working models of real-life ...
5 votes
1 answer
387 views

Any cheap Technic sets with a good variety of parts?

I want to start building a module like GBC Miniloop 01, but when I check the part list some are very hard to find. How should I get started with miniloops? BTW, I got a very big set, Bucket Wheel ...
10 votes
2 answers
396 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 ...
7 votes
1 answer
511 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 ...
3 votes
1 answer
627 views

Identify this T-shaped part

Seems to be used for making differential gearboxes, cars, and GBCs.
6 votes
2 answers
608 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 ...
7 votes
1 answer
481 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.
35 votes
6 answers
12k views

Why does LEGO now use studless technic designs?

It seems to me that sometime between 1998 and 2006 (between the Mindstorms RCX and NXT), LEGO switched from using studded technic bricks (like this:) to studdless beams (like this): In my experience,...
6 votes
2 answers
3k 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 ...
-2 votes
3 answers
257 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?
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 ...
5 votes
1 answer
474 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 ...
0 votes
0 answers
41 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.
1 vote
0 answers
159 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 ...
8 votes
1 answer
375 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.
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 ...
8 votes
3 answers
2k views

LEGO Submarine waterproofing functional parts (e.g. motors, RC receivers)

From my understanding, the motors and RC receivers are not waterproof. Thus, the LEGO submarine from Sariel's LEGO® Workshop rust after sometime. So, is there any way to make the motors and RC ...

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