Questions tagged [technic]

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

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10
votes
4answers
587 views

How to make a regular pentagon from technic bricks

For the purposes of this build, we need a pentagon (figure with 5 sides), that is regular (all sides have equal length), and it needs to be able to be mounted on a build (like a wreath) by a technic-...
3
votes
2answers
2k views

What's the maximum pressure one airtank can withstand and how to tell its limit?

I bought a airtank and using it to support many v2 pneumatic cylinders, while I'm using a v1 pump and one motor to pump air to this air tank. Since another airtank or a lego pressure gauge is very ...
2
votes
1answer
302 views

How many pneumatic actuators does one air tank support

For example, I want to use air tanks to supply pressure to up to 18 pneumatic actuators (19475c01), but I don't know how many air tanks I should buy to supply the air pressure required by all of them. ...
3
votes
1answer
272 views

Eneloop NiMh batteries not powering 42030 loader

Is it because the batteries are only 1.2V? It works fine with Duracell alkaline batteries.
9
votes
1answer
464 views

What part(s) can I use to connect modules at a 90 degree angle?

I'm looking for brainstorming! All ideas welcome. I have a design I'm working on which: is made of a bunch of identical modules fitting into a single framework has to allow the modules to "plug in" ...
2
votes
1answer
289 views

How to Motorize the LEGO Mars Rover

I am looking for some suggestions. My daughter is building the Mars Rover set (go here for the details: http://www.eurobricks.com/forum/index.php?showtopic=98222) for a presentation at school and I ...
0
votes
1answer
80 views

Having trouble pushing 6.6L bar into pin connectors

I have a dilemma where I am trying to push a 6.6L bar(4095)through 3 stacked pin connectors(62462) that have 1 long pin(6558) and 2 pins (4459) inserted. The bar only goes in a little bit and then it ...
4
votes
2answers
372 views

How to clear off oils in a way that will not damage the plastic?

Especially with the pneumatic cylinders, so it has to not make the metal rust too. Also, it is oxidized vegetable that is stuck in there, inside the pneumatic cylinders. And it started to make it all ...
1
vote
3answers
272 views

What is the name/number of this brick

I was wondering what the two grey tile like bricks in the image below are? I wish to order some online, so would appreciate knowing their name.
11
votes
1answer
1k views

How much current do the LEGO motors draw?

I'm building a project with Raspberry Pi and some other electronics driving the LEGO Power Functions M-Motor (8883) and I need to know how much current those motors draw under load. Has anyone done ...
5
votes
2answers
3k views

How do I diagnose a problem with electronic bricks and motors?

My children and I recently assembled the 42030 RC VOLVO L350F Wheel Loader (aside: with the 1,600 pieces and time investment, this set will likely survive to the heat death of the universe intact ...
3
votes
1answer
906 views

Instruction for installing rc to LEGO unimog

I'm searching for an instruction to install a remote control to my LEGO unimog. There are a log of youtube videos showing completed unimogs but I can't find any instruction.
9
votes
1answer
290 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 ...
3
votes
1answer
782 views

What are the measurements of the different Lego instruction booklets?

I've noticed that there are at least three different sizes (eg 7.8"x5", 4"x5.8" and 7"x8"). Are there other sizes?
4
votes
1answer
432 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 ...
3
votes
2answers
601 views

Where can I get threads compatible with LEGO pulleys?

Have LEGO threads ever been produced? Even the biggest LEGO rubber band is too short to meet my requirements. I need them for this year's WRO challenge. Note that the challenge only allows Lego ...
3
votes
1answer
609 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??
9
votes
4answers
888 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 ...
6
votes
1answer
1k 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.
7
votes
2answers
2k 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 ...
2
votes
1answer
128 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
399 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 ...
4
votes
1answer
591 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
2answers
1k 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
229 views

What Technic vehicle is this in black and red?

Any help with the set this piece is associated with, would be appreciated.
4
votes
1answer
254 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
1answer
3k 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
1answer
553 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 ...
5
votes
1answer
448 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) ...
7
votes
1answer
3k 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 ...
5
votes
2answers
4k 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/...
5
votes
1answer
2k 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
411 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 ...
2
votes
2answers
1k 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 ...
17
votes
3answers
2k 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 separated ...
4
votes
2answers
682 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
440 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 ...
6
votes
2answers
1k views

How much torque can a lego axle handle?

from to this question, it seems that the gears are stronger than the axles, which begs the question of how strong are the axles? if you connect one of the stronger motors, such as say the buggy motor: ...
6
votes
1answer
2k 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-28-...
4
votes
2answers
440 views

LEGO Technic Interface A

A few days ago, a friend offered me one set 9750 LEGO Technic Interface A with the Interface Card and Cable (IBM compatible) but without software. Can someone share the installation software (LEGO ...
7
votes
1answer
186 views

What is the best system for lifting things without pistons?

I am building a big walker thing. It has a mining laser at the bottom that can be lifted on one half, and the other is attached to the vehicle. However, I can't seem to find a way, because the hooks ...
5
votes
1answer
258 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
0
votes
1answer
216 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 ...
10
votes
3answers
2k 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 strong enough.
6
votes
1answer
2k 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 ...
8
votes
4answers
475 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 ...
3
votes
1answer
272 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?
2
votes
1answer
242 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
1k 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 ...
9
votes
2answers
4k 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 ...