5 Planetary Gearsets in Lego

[@Simple_But_Expensive]

Three strengths of planetary gears: 1) The input and output are on the same axis. Normal gearboxes either require offset axes or multiple stages of reduction. 2) Planetary gears can reach much higher gear ratios in a compact space than can be achieved with an offset gearbox. 3) The gears in an offset gearbox push each other apart, causing uneven loads around the circumference of the radial thrust bearings. Planetary gearboxes even out this loading. By getting creative, you can do many interesting things with a planetary gear. I once designed a transmission that shifted gears by changing which gears were locked. It used two planetary gears in series. Impractical but fun to play with. It was decades before Techniques came out, so I did it on paper as part of my mechanical engineering degree. Turns out it wasn’t an original idea (see tank transmission), but it sure was fun figuring it all out. Be interesting to see if anyone can build one using Legos.

[@GTech_builds]

well spoken and simple

[@mephInc]

​@@Simple_But_Expensive It's been done with Legos. I can't remember who did it though unfortunately. Something along the lines of "mechanical principles" was in the title and there are a bunch of videos showing gearing. One had a transmission with a series of planetary gears. Edit: found it. kzbin.info/www/bejne/iX-QXnuNa55mfMksi=ZniSBukN66OJs4BU

[@andrewtimothy1937]

I think what got me into cars in the first place is seeing the Thunder Driller’s massive drill rotate while you pushed it around. That was peak lego

[@bowfuz]

planetary gears are up there with the coolest mechanical doohickeys 🧡

[@EvanMoon]

Having all the pieces is the key… I don’t have them

[@coledavidson5630]

Yeah the only ring gear I have is the Power Miners one lol

[@NathanaelRig]

Having hands ist key ...

[@deadrosesforall]

@@coledavidson5630 i dont even have any 😭

[@mysteryguy7716]

there are a cople more of planetary gears. like the second smaller lego drill part, part 78442, part x784, planetary wheele hub(46490) and part 24121

[@jackpomeroy5855]

The inverse planetary gear set is almost like differential

[@in1]

Yeah it's somewhere between planetary and diff, because 2 of the diff outputs are switched

[@jackpomeroy5855]

@@in1 for your next KZbin video, can you make a Lego marble machine on wheels and have the motor drive both the lift mechanism and the wheels?

[@mech_magic]

@@in1It seems epicyclic to me, and Wikipedia calls the sideways gear "planetary." Essentially you built a ring-and-pinion differential that is missing the ring gear.

[@INF_Gamer]

Lego 20 years ago: a great designer for small children Lego now:

[@eonbree8593]

i like the idea of the third one. could it be made with the new version of the differential? the last one is actually pretty cool, i didnt know that was the case

[@in1]

The gear ratio would work, but you'd need to figure out what gear to use on the side, and I'm not sure if that's possible

[@Pauloux]

Very good video ! If I have one tip for you is the focus of the camera that sometimes changes when you move your hands and it becomes blurry. Maybe setting the focus manually would help ?

[@0402045118]

1:7 is possible with normal gears, since a 28 tooth gear exists. 28:8 + 16:8

[@in1]

You're right, I forgot that one... But, of course, it won't be easy to space the 8t and 28t

[@etoma1030]

il est également possible d’obtenir des ratios particuliers (1/7, 11/3, 37/41...) en jouant avec des différentiels... mais le résultat est tout autant peu efficient qu’inutile ;)

[@Gin-toki]

About the last one. Take a look at the lego part 6365803 "Wheel Hub No. 4" it has a built in planetary gear with a ratio of 5.4:1.

[@alexandersafronov7796]

8th comment! Happy New Year! (2024) (0:00)

[@GTech_builds]

#3 is practicaly a differental if redesigned a bit

[@in1]

Yeah it's pretty similar, the inputs are just on different sides

[@GTech_builds]

@@in1 yeah and that is easily adaptibale

[@AlexBahena-v8o]

Can any planetary gearboxes be made with the other ring gears?

[@jakemarcus9999]

Wow these are nice ideas

[@ju.vo.369]

i love your videos

[@heho1]

Cool 😎

[@zahari_s_stoyanov]

3 is basically a dif

[@maxmuller445]

Also all the lego differentials are planetary gearboxes

[@in1]

Yeah, depends on the kind of definition. The "outside in" planetary gear is prolly closer to a differential than to a classical planetary gear

[@kylmalubas]

❤

[@Zzzz320]

It took u 1 year to make a video xd

[@Иван-х5ш5з]

Hi bro aim speak Russia What you speak Russia?

[@kylmalubas]

Hi i am brazilian

[@alexandersafronov7796]

Yoooooo)) Hi "brazilian"

[@alstillplays]

Hello your computer has virus

[@redstonegod296]

@@alstillplays that's Indian

[@nathanieljames7462]

​@@redstonegod296🤣

[@alstillplays]

@@redstonegod296 yes

[@jcgwinn]

Yooooo

[@kylmalubas]

Oi

[@esthersanchez3112]

7th comment!

[@kylmalubas]

Oi