Questions tagged [gears]
Gears transmit rotary motion and are commonly found in Technic sets.
55
questions
3
votes
1answer
110 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 ...
5
votes
1answer
168 views
Grand piano page 269 of instructions - are the gears suppose to stop after a quarter turn or keep going when reversing directions
The directions show the gears are suppose to move counter clockwise. When I follow the directions on page 268-269, and push the reverse button on the Lego power-up app for the Grand Piano, the gears ...
2
votes
2answers
145 views
Automating rotation of a block on a track
How do I rotate a block 180 degrees after an item (like a car or train) passes a certain point in a track?
3
votes
3answers
251 views
Extra Pieces for Lego Gadgets Book
My son is having a lot of fun with the Lego Gadget set (book and bricks), but he can only build one thing at a time, and would love to have a lot more of the types of Lego bricks that came with the ...
4
votes
1answer
139 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/...
3
votes
1answer
156 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 ...
8
votes
1answer
1k views
What is the purpose of the 8 tooth timing gear?
I recently ran across the 32060 Technic Gear Timing Wheel 8 Tooth element when sorting a mixed bag of parts.
This element doesn't appear in many sets as a functional element. Here's one example from ...
3
votes
2answers
575 views
How can I make my LEGO engine go faster
I have a LEGO engine powered by a PF XL motor but I didn't realize until now that the motor is not that fast and that even when I increase gear ratio the gears always get either unattached or jammed.
...
6
votes
2answers
421 views
How much energy do LEGO Technic gears lose to friction?
So, I recently watched a video by the Brick Experiment Channel about building a 1 Googol:1 reduction gearbox, which at the time of writing this question, is at #44 on Youtube Trending. At the end of ...
0
votes
0answers
100 views
Front driveshafts on landrover defender don't stay in place
The front driveshafts on my Land Rover Defender keep falling out, then the cogs fall out of the front differential. I have done them three times as per the manual, but every time I get the same result....
2
votes
1answer
271 views
How to make a Lego continuous conveyor belt
So I need to make a continuously working conveyor belt transporting blocks.
I have seen this post, but additionally, as already said, I have to make it work continuously transporting blocks,so I have ...
8
votes
3answers
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, ...
3
votes
2answers
316 views
Lego Technic 60C01 Clutch Gear Bore size
I was wondering what the bore size is off the 60C01 clutch gear as I was unable to find it anywhere. Also, what is the pitch of such gear?
4
votes
1answer
189 views
How to debug gears in the Bucket Wheel Excavator?
My 8 year old is just finishing the Bucket Wheel Excavator. He turned the motor on and there is a significant clicking noise. It looks as though the top gear noted in the picture gets stuck. Not sure ...
0
votes
0answers
124 views
Is there any software except SR 3D Builder with the ability to simulate the interaction of gears that doesn't require scripting?
I'm aware that one can do that in LDCad but with scripting.
Should I invest my time in learning SR 3D Builder or is there any other option? It's just not a very intuitive software for me but I might ...
10
votes
1answer
6k views
9398 4x4 Crawler front wheels rotate in the opposite direction to the rear wheel
We've just finished 9398 4x4 Crawler. Everything looks good, the motors work but the front wheels rotate in the opposite direction to the rear wheels, they also turn in opposite directions. What could ...
10
votes
4answers
909 views
How can I assemble 2 opposing gears so that the axle rotations are perfectly parallel?
Due to the way all the modern LEGO gears are perfectly quarter-turn symmetrical, there doesn't appear to be any way to assembly 2 opposing gears such that I get a 2 perfectly parallel axles.
This ...
14
votes
1answer
904 views
Part identification: 40 tooth gear from The LEGO Movie
While watching clip of the LEGO Movie, I found a strange part:
Slightly earlier in the video, its part number is shown as 3649.
But it doesn't match the 40t gear I know nor the pictures on bricklink....
5
votes
1answer
453 views
Does LEGO Digital Designer include part 4539880?
Does anyone know if LEGO Digital Designer includes the part 4539880 (often used for housing differentials) ?
7
votes
2answers
220 views
9398 reduction change
I am studying implementation of 9398 crawler reduction.
Here is the stripped part, in order to see the gears and their relation - the image is made with the excellent tool which is LDCad.
My idea is ...
10
votes
1answer
343 views
High Torque Subtractors
I would like to use a subtractor in my next RC LEGO tank, as it enables the vehicle to turn on the move, as opposed to stopping and then turning.
Unfortunately, the subtractors I have tested so far ...
11
votes
1answer
11k views
What are the dimensions of a technic axle?
I'm working on a LEGO compatible motor system that will be largely 3D printed. I want the connectors to fit standard LEGO axles, but I haven't been able to find the dimensions online, and I don't ...
5
votes
2answers
2k views
How to best transfer power at 90 degrees for high torque applications
So, I am building a tank model and this is the transmission I have been working on:
Description:
There are two gear pairs for gearing up (16t to 8t gears) and one gear pair for gearing down (worm ...
3
votes
1answer
203 views
Clutch gear test
I have two white 24t clutch gears, one marked as 2.5-5Ncm and another unmarked - how can I assembled them in a way to test which one "gives" first ) i.e. has torque before it slips - I was thinking to ...
5
votes
1answer
3k views
Any tips for aligning gears in LDD?
I'm trying to create the 42052 (Heavy Lift Helicopter), and other Technic sets. Aligning gears' teeth is relatively difficult, and the 'Hinge Align' tool rarely works. Please help!
1
vote
1answer
672 views
How can I build a compact EV3 gearbox?
I'm building a sumo bot in EV3 and would like to have both 1:1 and 1:3 gear ratios, with the first being useful for general driving and the second more for pushing other robots.
My problem is, I ...
3
votes
1answer
162 views
Which system is more efficient?
I got a few XL power functions motors, and want to combine them to make a racing car. Let's get to right to the question:
Which one save the most torque power? This one...
...or this one?
PS: It ...
2
votes
3answers
495 views
How do I increase axle speed using gears
How do I increase speed of my output axle 24 times using 8, 16, 32, and 64 tooth gears using LEGO Mindstorms components? I checked Sariel's website but it was no help.
5
votes
2answers
4k views
Lego Digital Designer: Having Gears Interact with Toothed Bar
I just started using LDD, and I have been trying out a few things that I couldn't do with the limitations of my Lego collection. One thing that has me caught up is that I can't seem to get the ...
7
votes
2answers
455 views
Non-working technic system
Recently I've been working on a car which when going forward is fast, and when going backward automatically goes slowly.
Here are two photos of it:
(Just replace the text by "input") As you can see, ...
4
votes
1answer
409 views
Are DUPLO gears compatible with LEGO gears?
Can I make a transmission from DUPLO gear (Early Simple Machines Set 9656) to regular-sized gear?
2
votes
1answer
377 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 ...
4
votes
1answer
430 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 (...
5
votes
1answer
550 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)
...
8
votes
1answer
5k 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
5k 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/...
4
votes
2answers
597 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 ...
7
votes
2answers
2k 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:
...
8
votes
2answers
3k 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-...
3
votes
1answer
390 views
What does “No Friction” mean in Parts “Gear with 8 Teeth Wide, Notched and No Friction”
http://www.brickowl.com/catalog/lego-gear-with-8-teeth-wide-notched-and-no-friction-11955
As title, what does "No Friction" mean in the part "Gear with 8 Teeth Wide, Notched and No Friction" ?
2
votes
1answer
347 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 ...
6
votes
2answers
767 views
Gearing down a PF XL
I'm looking for the best way to gear down a Power Function XL.
I need to achieve a very slow output RPM (less than 1-2 RPM). I've tried a 625:1 gear (trough 40:8 gear). Can someone link to a well ...
8
votes
2answers
930 views
Any way to create a gear+chain, like for a bike?
I would like to create a LEGO bike. I can imagine how most of it would work, but i'm stuck at the chain.
I need a way for the turning pedals (at one spot) to cause the wheel (in the back) to spin ...
14
votes
1answer
2k 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?
14
votes
1answer
825 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 ...
16
votes
1answer
2k 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 backwards, the first gear does not move, but the second one does.
I found ...
4
votes
1answer
5k views
How can I controll the speed of motor using gears?
Can anyone tell me how to use gear wheels to modify the speed of the motor in the Power Functions set 8293?
I know I could use the remote control unit, but I need to have a fixed slow speed on a ...
8
votes
1answer
2k 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
votes
2answers
1k 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 between ...
11
votes
3answers
3k 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, i....
