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

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3
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1answer
117 views

How much tension can I expect to get out of a lego chain 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 16t gear to directly drive a 24t ...
2
votes
1answer
825 views

EV3 Error and VM Program Instruction Break

I'm making a program which is very complex and large but it does not contain any Arrays in it. Weird thing is, last night it worked fine but today when I downloaded the exactly same thing into the EV3 ...
5
votes
4answers
274 views

How to help a yellowed brick with a sticker?

My parents recently finally decided they can return me my childhood toys with 1990s Technic sets including the 8880 Super Car. All other sets were in boxes, but this one spent the last 15+ years ...
26
votes
6answers
11k views

What are the best options for building a LEGO RC car?

I would like to build a remote controlled car. And if someone already has a good solution for that I would be glad to try it. It's been a while since I had the time and material to build some LEGO ...
4
votes
1answer
452 views

What is wrong with a Lego pneumatics system that won't go?

I own a LEGO Technic Unimog U-400 (part number 8110) and have been very pleased so far with the performance of its pneumatic system. However, after storing for just a month or two (after a good 5+ ...
3
votes
2answers
330 views

Custom Power Functions plug design

I'm considering the possibility of making my own Power Functions-compatible sockets for a project. I'm designing a module board for a single-board-computer with motor drivers and would like to encase ...
3
votes
1answer
127 views

Wiring and Controlling an 88004 servo from a RaspberryPI

My 88004 servo does not move at all. Don't know how I should connect the wires correctly. I think the inner two cables are C1 and C2 and the outer two GND and VCC. When I connect 6.5V to the outer ...
5
votes
1answer
860 views

How to control a 88004 Servo Motor with a Raspberry Pi?

I am able to control a simple servo motor such as SG90 by using pulse-width modulation. However when it comes to controlling a 88004 LEGO Servo Motor it is simply a nightmare. By using PWM all I ...
2
votes
1answer
191 views

Differences between EV3 Gyro and Hitechnic Gyro

I understand that the Hitechnic Gyro was made for NXT but are there any advantages of using it over the normal lego gyro in EV3??
12
votes
4answers
1k views

How to unplug black friction pin connectors

Black friction pin without slots connectors are common in older Technic sets. Note that these were quickly replaced by the current version with slots that is much easier to remove. vs Especially ...
5
votes
1answer
99 views

Difference between gyro sensor and compass sensor

Does the HiTechnic compass perform the same function as the gyro sensor? I have been trying to find out the difference.
1
vote
0answers
51 views

How do you display EV3-G images properly on an NXT screen? [closed]

When I use the EV3 programming software to put an image on the screen of an nxt, it cuts off 3/4 of the image. How can I stop this from happening?
2
votes
1answer
115 views

I need help Identifing this set by the picture

I have a blurry picture of a set I found at a LEGO fair, and I would like to know what it is: Thank you.
3
votes
1answer
192 views

Overview of Engineering Principles incorporated in Technic LEGO sets

I run an after-school technology education program and want to expose kids to real-life engineering by means of having them build commercially available Technic kits which we then deconstruct and ...
1
vote
1answer
274 views

Linear Actuator of the boom of 42006 jams

I just built a 42006 excavator, and the Linear Actuator jams such that it can't be rotated. I think that the overly sharp angle of the u-joint at the top of the boom is the reason. Is there a ...
2
votes
1answer
191 views

Can you use a beveled gear as a pinion?

I would like to use the PF servo motor for steering, however it is very large - I was playing with the idea of having it mounted vertically, and then using bevel gears to change the direction of the ...
4
votes
1answer
144 views

Any issues with this non-standard gear combination of 12t gears?

I don't see any "accepted" gear ratios for a stud-less direct-diagonal gear combination on sariel's excellent gear coupler but by shifting 12t gears such that they mesh off-center, it seems to work ...
3
votes
2answers
244 views

At what voltage do the c1 and c2 lines run at when controlling a lego servo motor?

related: how to control a servo motor from a raspberry pi The raspberry Pi normally outputs 3.3 V signals from it's pins, however there are logic level converters for interfacing with higher-voltage ...
3
votes
1answer
190 views

What Technic vehicle is this in black and red?

Any help with the set this piece is associated with, would be appreciated.
3
votes
1answer
189 views

Why can't I combine a EV3 Motor with a Technic frame in LDD?

It is easy and stress-free to attach a frame to a large motor in a vertical or horizontal manner as shown in the picture in real life. But I can't do the vertical version inside LDD. Anyone knows why? ...
4
votes
0answers
185 views

8258 Headlight assemblies

Anyone else having a problem with with headlight assemblies on 8258 crane truck? I can't seem to fit them in due to interference from fog light bar. Thanks
3
votes
1answer
207 views

How exactly does the pull-back motor (12787) work?

I've got the 42034 Quad for my birthday and it's been really fun to play with technic after so many years. I am very curious about one thing, though - how does the pull-back motor (12787) work and ...
4
votes
1answer
191 views

Which combination has a lower gear friction?

I need roughly a 1:3 reduction and I see a couple of ways to achieve it: using a 8t gear and a 24t gear (1:3) using 2x 12t gears and 2x 20t gears (1:2.779) using a 16t gear and a 40t gear (1:2.5) ...
4
votes
1answer
560 views

Pre-Technic gears?

I have this set of LEGO gears. I remember seeing them first at my grandparents in the mid 80's. They predate my first Technic sets (~84 or 85). I have fond memories of my dad building a 3-speed ...
5
votes
1answer
640 views

What is the “Module” of a LEGO gear?

Module, m this indicates the tooth size and is the number of mm of pitch circle diameter (p.c.d.) per tooth. For gears to mesh, their modules must be equal. Gear ISO standards and design methods ...
3
votes
2answers
491 views

How important is a center differential on a 4WD model?

I am looking to make a 4WD, single-engine powered vehicle, and I have seen others such as this which use three differentials to distribute the power to all 4 wheels: http://www.eurobricks.com/forum/...
6
votes
1answer
452 views

How should I connect two LEGO cylinders with pistons to measure the movement caused by sea waves?

As part of a school project I need to make a model of a snake electricity generator. I would like to build this with LEGO elements, and for that, I need to measure the movements of the cylinders ...
3
votes
1answer
119 views

Best system for lifting things without pistons

So I am Building a Big walker thing with a mining laser on bottom that can be lifted on one half and the other attached to the vehicle but I cant seem to find a way because the hooks attached to the ...
2
votes
2answers
407 views

How to design ackermann steering with lego wheel bearing front?

I wanted to use a steering system based on the 11949 part: But I am not sure how to use it in an ackermann system - I would like to be able to have drive and suspension on the wheel, and this piece ...
11
votes
3answers
921 views

What tool can get the Technic pin out from a connection closed in the other end?

I'm having trouble removing these LEGO Technic pins apart from their connectors and I don't want to use carpenter tools like pliers which may damage the bricks. What tool can get the pieces ...
3
votes
2answers
213 views

What is the difference between these two Technic half bushings?

While randomly browsing some LEGO sites, I came across a weird (to me anyway) looking bushing. Its part 4265c. Below is one of the images describing it and the left one I recognize, but the right one ...
4
votes
2answers
210 views

Large trap door - alternative to door with frame 4595708

I need to build a large trap door, the trap door 4x5 with frame 6x8 is too small for my model. Other doors/hinges seem to have too much resistance and the door doesn't fall by itself, it must be ...
1
vote
1answer
177 views

Can Mindstorms EV3 communicate using protocol 802.15.4?

My aim is to make the robot communicate using protocol 802.15.4 through a USB dongle 802.15.4 over 6LoWPAN. The robot has to be able to get information from TelosB. I wonder whether this possibility ...
5
votes
1answer
882 views

How to build a limited slip differential?

Lego provides a couple of ways for building a differential, such as this: and also provides a limited-slip gear like this: http://www.brickowl.com/catalog/lego-technic-differential-with-one-gear-...
4
votes
2answers
521 views

How can I attach a Technic Linear Actuator to a EV3 Medium Motor?

I'm pretty new to serious LEGO building (never got past very blocky houses as a kid but got into Technic a couple of months ago) and need to connect a Technic large linear actuator (61927) to a ...
13
votes
6answers
8k views

What are the largest Technic-compatible tires on the market?

I am looking for the largest LEGO wheels with tires available to build a nice-sized RC LEGO car. Of course I will start with the simplest prototype, but I would like to achieve a design which will ...
4
votes
4answers
2k views

What other uses are there for pull-back motors?

Sets 42010 and 42011 feature a pull-back motor. They have a very high torque for a very small numbers of turns, they then free-wheel. I'm trying to find alternate usage for them. That is anything but ...
11
votes
3answers
4k views

How to start with technic?

I have bought myself the technic set 9393 Tractor. I really like the model and I want to dig deeper into the Lego technic universe. I am not focused in building pre-designed models (although I enjoy ...
0
votes
1answer
120 views

9398 problem with the front wheels

I've just finished 9398 4x4 Crawler. The rear motor works properly, but the front motor doesn't: The wheels seem to be locked, although they spin freely when I turn them by hand. What could be the ...
6
votes
1answer
481 views

How can a Mindstorms robot lift something very heavy?

I have a small LEGO Mindstorms robot and I have to lift something heavy. Now it seems not possible because the motor is not heavy enough.
19
votes
4answers
5k views

When did Lego decide that it was okay to put a stud into a technic hole?

At one point, Lego didn't really support putting a stud into a Technic hole, stating that it caused too much stress on the bricks. And for a while, there were no sets where that's the case. However, ...
13
votes
2answers
1k views

Are Samsonite gears compatible with modern Technic gears?

Do the old Samsonite gears (above) work with current Technic gears (below) LEGO bricks tend to be backward compatible with older bricks, but since I don't own any Samsonite gears I cannot tell. ...
6
votes
2answers
236 views

City scale connection for five-bladed helicopter rotors

I want to build a Super-Puma helicopter in city minifigure scale and form, I have the basic design planned, but I am not familiar with any five-sided technic connectors, which I will need for the ...
6
votes
2answers
991 views

LEGO Technic part Numbers

My daughter got the LEGO Technic - Service Truck set. When we looked at the instructions, we saw a different notation on parts. eg: the beams (cross beam) it has number 5 in white circle. what does ...
2
votes
1answer
219 views

How to connect chain links to the axle

In my project I want append two 21 chain links to the axle 12. Is this any axle connector with knob ending?
1
vote
1answer
175 views

Parts/Step not fitting ( technic / gear not aligning)

working on Lego Technic; Recovery truck. Reached Step 27(book 1)....fixing the rope spool. and found that the white gear wheel is not fitting in. i.e., i have the white gear fixed on the shaft with ...
4
votes
2answers
409 views

Identify these (Technic Steering) parts?

These three parts do not have part numbers on them, but it is clear they are LEGO parts (they have LEGO printed on them). I am trying to track down the set that these belong to, or at least a part ...
4
votes
1answer
379 views

What is this weird and specific technical part?

I found this part among some parts I bought. It looks like it serves a specific purpose. What is it?
3
votes
1answer
599 views

LEGO TECHNIC CyberMaster Software

I come again to ask a favor. Can someone share the installation CD in English of LT 8482 CyberMaster or where can I download the software in English??
9
votes
3answers
2k views

How to Make a Lego Claw Arm?

I am trying to build a lego claw arm to pick up stuff that is out of my reach and I need some ideas on how to design it. I would like a mechanism to be able to open and close the claw from the ...