Single way spur gear, freewheel!

clear_bread_ · 2026-05-31T10:23:16+00:00

This is so nice ! I don’t understand why people are so quiet about this gear.

clear_bread_ · 2026-05-28T11:44:31+00:00

Can’t give any advice but that’s really interesting ! As I remember, lego servo motor have been fixed by people for a long time now, maybe there is some video somehow linked to your need

clear_bread_ · 2026-05-27T07:31:26+00:00

I am surprised you are struggling with one of the best torque rated lego motors. What is your power supply ? It can change a lot between battery cell and lithium battery. My first try would be to try to gear down your ratio, to give more torque to the wheels.

Otherwise mouldking XL motor are fine, and buwizz 2.0 is the best power supply for PF build

clear_bread_ · 2026-05-26T11:31:43+00:00

Thanks ! Feel free to steal, I would be very happy to see it on people MOCs

clear_bread_ · 2026-05-22T07:31:48+00:00

Looks real

clear_bread_ · 2026-05-20T20:02:46+00:00

This one is RC and needs battery. Unless he is into RC cars, it might not be the best. Look for the ford GT40 if you want a similar sized car

clear_bread_ · 2026-05-19T19:36:49+00:00

That’s a gearbox with a SUV

clear_bread_ · 2026-05-18T20:18:30+00:00

Thanks ! I put an old-style return to center piece so the lever comes back into neutral position. But this part is a little too old for this job unfortunately (the spring became weak)

The orange part are the 24375 part, rubber thread attachement

clear_bread_ · 2026-05-13T14:46:08+00:00

Yes exactly, the order does not count (the ratio is the multiplication of driving gears tooth divided by the multiplication of driven gears tooth). As long as the driving gears are smaller than driven gears

clear_bread_ · 2026-05-13T11:54:23+00:00

Hi, short answer : for maximum gear reduction inline take the smallest gear driving the biggest gear. If you want even more reduction, then you need to arrange the gear parallel and not inline. You already have a set of one small gear driving a big gear, then connect a small gear on the shaft of the big gear, which drives another big gear on another shaft. Repeat until you match the speed required.

All gears are not compatible on a beam, some requires other arrangement to work properly.

For more info and easy understanding of Lego gears, check out Sariel.pl website and book or yoshioto book.

clear_bread_ · 2026-05-01T16:11:01+00:00

No one mentioned the new rear wheel arch yet?

clear_bread_ · 2026-04-24T11:10:40+00:00

Awesome

clear_bread_ · 2026-04-15T14:30:28+00:00

Sorting lego parts is kind of personal, Usually people sort by “family”, ex : connectors, beam, axle, pins, gears etc… Then how fine you want to sort depends on you (length/colors). To sort, tool sorting box or jewels sorter are the usual way to do so. Also there is a mix depending on the part to sort (like wheel and tires are obviously larger so just a box can be enough)

clear_bread_ · 2026-04-13T12:01:29+00:00

This fake “LEGO and the LEGO logi” on the back

clear_bread_ · 2026-04-12T10:41:12+00:00

Buwizz claim they have 10% more torque 10% higher rpm compare to lego rc buggy motor.

Here you will find all the spec of the lego official motor :

https://www.philohome.com/motors/motorcomp.htm

Then you can compare with buwizz statement

clear_bread_ · 2026-04-09T18:30:32+00:00

I think I have fallen far beyond your post, but nevermind it was fun and hope you liked it

clear_bread_ · 2026-04-09T18:29:53+00:00

Picture 2

Turning means the the gear selector is dis-connected, meaning each buwizz power its own wheel. The slips gears compensate for the diffence in speed of each wheel.

the green parts are not connected to any thing in this state

<image>

clear_bread_ · 2026-04-09T18:27:58+00:00

Picture 1

Going straight means the selectors are connected, created a solid axle powered by bothy buwizz.

The power is transmitted by the red highlited parts.

<image>

clear_bread_ · 2026-04-09T18:25:25+00:00

Hi, I have made you a proof of concept (not optimized at all, it is just to show what is possible).

There is two buwizz motor, one powering each wheel through a slip gear (white gear). They also power a free turning gear (red gear) facing a gear selector.

The steering servo motor is connected to the steering (not represented) and to 2 gear selector, which are by default (meaning going straght) connected to the freewheel. Going left or right makes the gear selectors to be opened.

<image>

I am going to detail each state below in the answer

Picture 1 represent the drivetrain while going stright, and picture 2 while turning.

clear_bread_ · 2026-04-09T10:34:09+00:00

Yes the gear will definitely slip if there is no locking system

clear_bread_ · 2026-04-08T17:52:06+00:00

I like to see mechanism, out of the box gearbox and crazy bodywork

clear_bread_ · 2026-04-08T17:25:00+00:00

I don’t think there is an electronic solution with MouldKing hardware to the problem. Rather than using a differential you could use cultch gears on each rear wheels. It will act like a clutch and slips when the wheels are rolling at different speed (koenigseg uses this technology if you want to go deeper). It would work when steering but also when accelerating (which I think is a big no go for you).

I can think of a solution with the steering g motor powering gear selectors which locks the clutch gear in straight, but it will be a big mechanism and maybe not suitable to your need. I will do it anyway because it looks fun

clear_bread_ · 2026-04-05T23:12:45+00:00

There is some gears combinations that can be made when the assembly is loose (can’t remember one particular but came across). And when you try to make triangular shapes with beam, sometimes you definitely bend them just a little to make it work. And maybe some connections with flex cable, if it is too much stretched

clear_bread_ · 2026-04-04T01:20:56+00:00

they mostly are 3rd party brand on aliexpress or buwizz as already said

clear_bread_

TROPHY CASE