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

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77 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) ...
3
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1answer
110 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 ...
2
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2answers
76 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: ...
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1answer
82 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+ ...
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1answer
62 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 ...
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2answers
85 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
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3answers
812 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
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2answers
128 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 ...
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2answers
128 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 ...
2
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1answer
118 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: ...
2
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1answer
542 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: ...
2
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1answer
98 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 ...
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0answers
108 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
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1answer
110 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 ...
4
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1answer
251 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.
2
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1answer
309 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 ...
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2answers
187 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 ...
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1answer
183 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?
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1answer
121 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 ...
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2answers
315 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 ...
4
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2answers
406 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
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1answer
335 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??
4
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1answer
132 views

What is this model number please?

I don't have the instructions for this and I have no idea what model number this is. Can anyone identify it?
10
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1answer
320 views

What's the purpose of the clutch gear in Power Functions set?

I have just bought this set and wonder the purpose of the white gear in the middle: How can you use it in your Lego Technic projects? Is it available in other sets?
11
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1answer
281 views

What is the difference between these hole shapes?

I purchased an assorted bag of LEGO Technic pieces. There are pieces with axle holes, but what puzzles me is that the holes are different from what I am familiar with. There's a piece with an ...
10
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3answers
723 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 ...
3
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1answer
327 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
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2answers
140 views

Simple optical switch?

I have built a conveyor belt for my son out of Lego Technic. Now, I would like to add a simple optical switch (so that the belt stops when an object arrives at the end of the belt..), and I am not ...
5
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1answer
864 views

Virtual LEGO / Technics / Mindstorms simulation environments

I know that there are quite a few LEGO CADs floating around, but are there any physically correct simulation environments for models built with LEGO / Technic / Mindstorms parts, that would, for ...
4
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1answer
549 views

How can I make a precise one-way clutch using Technic elements?

I need a mechanism so that if a (NXT) motor rotates forward, it moves one gear, but the other stays still, but if it rotates backward, the first gear does not move, but the second one does. I found ...
5
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2answers
653 views

Is it possible to create a differential if I don't have it as a ready to use element?

I have numerous gears, axis and other elements from different Lego Technic sets. I wonder if using them I can make a kind of a differential like this? If not, how can I implement similar ...
4
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1answer
170 views

Need help fudging a group in 8039

So, I'm building "8039 Venator-class Republic Attack Cruiser ™ Star Wars TM" and I've hit a snag. I need help fudging the instruction from page 76 of book 1 for that set (see picture below). I'm ...
3
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2answers
280 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 ...
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1answer
160 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 ...
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1answer
522 views

When and why were pieces 3651 and 3652 discontinued?

Bricklink has piece 3651 as Axle and Pin Connector, while piece 3652 is Engine Piston Square 2x2. You could attach them to each other to form a piston. Service pack 5260, Connecting Rods and Stop ...
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2answers
1k views

Where can I find LEGO Digital Designer projects for Lego Technic MOCs?

I have LEGO Technic pieces collected from multiple sets and would like to find projects on the web which I can view and build models step by step. Please advise sources where I can find these.
2
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1answer
405 views

Please identify this broken LEGO Technic piece

This piece is from LEGO Technic 8070 Super Car. Can anyone please identify its name as it's broken and I need to get a new one.
3
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2answers
596 views

How make a 6x6 board rotate using LEGO technic parts?

Are there any common patterns for making a 6x6 (or bigger) LEGO board have a ability to rotate using technic with gears and such? Has to be without the help of the existing 2x2 lego part that rotates, ...
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1answer
5k views

How do I get instructions to fully motorize Technic 42006

I have just purchased the Technic 42006 and would like to make it fully remote controlled.
6
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1answer
314 views

Alternative for Technic, Gear Rack 1 x 7 with Axle and Pin Holes?

We are trying to build a MOC which requires Technic, Gear Rack 1 x 7 with Axle and Pin Holes and we don't have that. Could we build it? Or are there any alternatives? FYI we do have Technic Gear ...
4
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1answer
356 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 ...
4
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4answers
1k 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 ...
1
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1answer
215 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 ...
3
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1answer
404 views

Getting started with Mindstorms and/or Technic

I'm looking into getting started with LEGO. Can you briefly describe the difference between Technic and Mindstorms? I've read that the parts and compatible, so I suppose it's the functions that ...
4
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2answers
385 views

What is the difference between 8T gears “Type 1” (3647) and “Type 2” (10928)?

On Bricklink I can see that there are two types of 8-toothed gear - a "Type 1" (3647) and a "Type 2" (10928). It's obvious these parts are not the same, but what is the functional difference ...
6
votes
1answer
666 views

What are the torque limits of gears?

I am using Lego in the classroom to introduce students to geared machines. As part of this I am asking them to design a winch, using a small 1.5V DC motor and a collection of the common Lego gears, ...
4
votes
1answer
410 views

How to build a car that stops at a certain distance?

I want to build a small car that is about 200 grams. I want it to run the following course and stop at exactly or about the the finish line. I can't use any controlling devices or electronics. I've ...
7
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2answers
312 views

How can I remove a rubber band from a pulley?

We have a pulley and a bunch of rubber bands: We don't know that part numbers, but they all were part of a Mindstorms (RCX 2.0) set. My son was trying use the pulley and band to transfer power to ...
5
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3answers
2k views

Is there a Technic set that is just an assortment of parts and not a specific vehicle?

Can I buy Technic sets that are just assortments of parts as opposed to a specific vehicle? Background I do research on sediment carbon cycling in lakes and I need use a rotating array of magnets to ...
5
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1answer
742 views

Buying another kit instead of 8293-1: Motor Set?

I want to get some motors but don't know if it is a better idea to buy 8293-1: Motor Set or try obtain motors from some other sets. Is there any kit challenging 8293?