Sir, 8 Years later, and this is still gold. Thank you. All these other guys make it so complicated.

I have searched the whole internet and this answered all my questions in 5 min thanks soooo much!!!

Thanks so much for sharing this! This really simplifies it as opposed to other explanations. This makes planetary gears far less daunting. Thanks Justin!!!

WHAT? You're not going to first make my eyeballs bleed with 30 minutes of riveting footage defining angular velocity? Thanks for the quick and easy explanation! I appreciate it!

So simple yet full of thought. Thank you for explaining this to us.

THANK YOU Justin! Absolutely fantastic educational video! Straight forward, and to the point! Extremely easy to follow..... and thanks to your Working Examples...... extremely easy to calculate & apply!

I love the use of a real gear and your quick review of basics

Thank you! It's one thing to have the knowledge and a completely different thing to be able to convey it. You seem to posess both. Good job!

Straight to the point simple and covered everything. Thank you very much

Awesome video. makes calculating ratios so simple, thank you

Thank you very much, I have also searched the internet for this information. This was simplified and just great! Thank you!

Plain and simple, and easy to understand. No "fancy" calculations that leave my head spinning

thank you for this video, cos all the other videos i found were just a demonstration of how the gear set works rather than finding the ratio.

@Justin Miller This finally begins to make some sense to me, thank you. Very good explanation and video.

Thanks for explaining it in a very simple manner. Thanks a lot 👌

Thank you .. I loved your content and the neat explanation!! Please keep making videos like this!!!😊

You're a great teatcher. Thank you. That's precisely what I was looking for.

Excellent, just what I wanted to know, thanks for posting.

Simplest and best explanation I've seen!!

Thank you so much for sharing this video, really appreciate

finally, you explained this very nice and simple. thanks so much bud.

Just the answer I've been looking for. That's easy once it has been explained in a simple way

your explanation is so good I give you a comment and upvote after 1:20 mins.

great vid! you cleared up a lot of confusion.

Quite simple explanation solved the puzzle. Thanks a lot

Thank you, as stated by others, well presented, easy to follow and started with the definition for a gear ratio. Really nice to see this.

Finally a clear explanation! Thank you...👍

Thank you so much.that was a neat presentation

Awesome Video, Perfectly informative. What is this Specific Planetary out of? I need this type of Planitary to make a Planitary Hub for a racing application, thanks!

Thank you. very well explained

Thanks, that was a great explanation!!

Thank you! Exactly what I wanted!

Thanks. Very helpful and description.

This give better under stand, thank you

Cool explanation ! Quick questions : how does the operator select which gear is the driver then? How do I know the efficiency of the transmission? (there must be some energy loss) How do I use this is real life applications? (say I want to move a 100kg load on a small platform with 2 or 4 wheels. How do I work out the torque required?) Thanks!

well explained......thanks miller

thankyou!! is this the same for offset epicyclic gearing?

Great video.

Magnificent video greetings from Córdoba Veracruz México

Very good teaching about calculate Planetary gear ratio sir

thank you. this helps me so much. how do you calculate the ratio with different amount of planetary gears? does it even matter? some have different size planetary gears in them.

Awesome!! Great instruction Thank you

its help me alot..thanks for the video..

So great! Thanks

This video was of great help. !! Sir can you please explain how to decide the number of planet gears and no.of teeth.? Thanks a lot.

Thank you explain this . 🙏

Good explanation

Hi man! how do you calculate when planets are fixed/held what you call a star set?

Thank you teacher!😀

Awsome explaination.....thankyou very much

Thank you so much!

Nice explanation

Good video. Is 120 teeth on the planetary gear sum of all the teeth on three planet gears?

Thank you very much :D

bro plz make a video which explains the whole calculation to design this planetary gear box for a vehicle with final drive ratios

Where can we reference that the planet carrier has R+S teeth? Need a reference for a project.

Very well explained! Thank you so much for this video!! Da boss!

Thank you.

It's just an idea! The idea is that: One to three is a completely balanced gear ratio for one link of a coaxial gearbox. This, for example, is optimal for a wind turbine, where the loads change by about two orders of magnitude - this is 100 times! Switches must be made between these links. And so: 1:3:9:27:81:243 Six-speed transmission. The wind speed acting on the entire washed area of the fan - this theoretical perspective windmill, varies from 2 m / s to 32 m / s! And the power removed from this electric generator varies from 2 kW to 200 kW! That's why you need such a reducer. I mean - It's a crazy idea to use a wind generator for hurricane winds. And, at the same time, - for very quiet winds - almost calm! For small autonomous settlements or even for separate remote buildings. The coaxial gearbox has an advantage both in terms of the weight of the metal, and in terms of the efficiency of the interaction of gears, and, probably, in other parameters. Perhaps the same gearbox is suitable for other technical objects, just need to think about which ones. Considering the remarkable parameters of the coaxial transmission scheme of the mechanical moment.

thank you! what i didn't understand though, is why you said we don't count the teeth of the planetary carrier. Why not? Certainly there are in fact a fixed number of teeth on one of those planetary carrier gears

thanks soo much this has helped

thank you.

Great explanations ! The actual planetary gear you have is used in what application ? What brand and model is it ? Thanks

I'll request if u can show the calculation by vector diagram plotting on graph paper to find out gear ratio , rpm and final speed of vehicle

Well said. But sir can you please explain , how to find gear ratio with two inputs and one output ( no component is held stationary)

Hi, this video was very helpful, thanks a ton. I have a few doubts though. 1. If the number of teeth on planetary gear is calculated by the sum of the teeth on ring and the sun, how do we calculate the teeth on each planet gear? 2. does this depend on the number of planets we have? thanks again

Is there any way to achieve a 2:1 /1:2 ratio with the sun gear being the drive, planetary carrier being driven?

Thank you

Smart ♥

May I ask you a question? You said that: Planet Carrier = Sun + Ring. In this case, we have 3 planet gears. But what if we only have 2 planet gears connect to the carrier? Is this formula still true?

What about when the planet carrier is always held still, and the ring is the drive and the sun is the driven, I need help on what I’m trying to make with ratios

How do you calculate a compound planetary gear set ratio or more than one set of planetary gears?

Damn this would’ve been useful like two months ago. Took me a while to figure it out.

can you tell me the dimensions of this.....and what is the DP

Justin, can you please tell me where you got the planetary gear set in the video? I am looking for an off-the-shelf planetary gear for a project and it appears that what you have would be about perfect. Thanks!

Awesome explanation ...... thanks for this ...... but one thing i share with u that sun gear has 28 teeth not 30 ..... ur guess around near .....

Great video sir! Thank you!

What happens on 2 stage planatery gear

i just learned something

Hi, I would like to know that gear you are using for education belong to which vehicle? Really important for me the information Thanks With Regards Sam Australia 🇦🇺

Then for the planet gears / pinions, we just estimate the number of teeth on the ring and sun gears, and add them up - or if desired, count the number of teeth exactly, and use the result to do the calculations ? Isn't there a precise formula that would be used for this ? There must be, or engineers would just be guessing when they make their designs.

From which mobil is this gear set?

HI WHERE THE PLANETART CAME FROM , WHERE DO WE GET IT

Thanks

if I have a one to four ratio does that mean the small gear is going four times faster?

how you have found 120 by Plant carrier ?

So if I had a sun gear with 12 teeth, a ring gear with 60 teeth, and the planet gears had 24 teeth each, I would add the s12+r60 = 72 and the p24 x 3 = 72 because I have three planet gears that would be a 6:1 gear ratio?

can any one or engineer tell me wether a planetary gearbox can operate on reversed rotation

Please reply: Is it possible to keep the ring gear stationary, not by holding it, but by rotating the Sun and the carrier at certain speeds? Thanks

IN GENERAL HOW MUCH TORQUE WILL INCREASE

well done explanation

So can there be a planetary gear set with a 1:1 ratio where the input and output are matched in speed?

Fitter happier more productive

shouldnt your ring be the sum of 2x the planet carrier + the sun gear??? so when your sun gear is 30 en your ring is 90 your carriers would be 60 together

To find the number of teeth on the planetary gears, do we divide the number of teeth of the carrier by the number of planets?

You da man!

How could the planetary gear have 120 teeth whereas it is smaller than the sun gear ⚙ consisting of 30 teeth?

Why do we say the planet gear has the sum of the gears of the sun and the ring?

Justin, can you explain how its done if the ring, sun, planets, and carrier are all rotating?

The number of teeth on the ring is the number of times it turns the the planets is the number of times the sun turns So if the ring has 60 teeth and the planets have 10 the sun turns 6 times because the sun can only turn the number of teeth on the ring