What makes planetary gearboxes so amazing?

I knew planetary gearboxes were fascinating before making this video, but I didn't realize how amazing they actually are. My mind was blown when researching information for this video. In this video I use a 3d printed gearbox to demonstrate just a few of the reasons why planetary gearboxes are so useful.

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[darktherapy]

The red lid you took off the superglue, there’s a sharp point inside the top of it - use that to pierce the new superglue rather than the metal tool you used.

[PanduPoluan]

I love how natural you presented the process, including (1) sliiight size mistake, (2) superglue getting on your fingers (3) oops should've used gloves (4) oops should've sanded _before_ mounting (5) okay this is not turning smoothly as I wanted (6) some things are dropping/disassembling themselves. Dang.

It's clear you're One of Us 😄

Great video 👍🏼

[mrnlce]

The ring gear is also known as an annulus gear.

[squishy]

This is a wild coincidence. I've been having issues with my automatic transmission that I rebuilt. To wrap my head around how it's really working and what the problem is, I've been modeling it to 3D print a small replica. I've got two of the planetary sets done, but I need to figure out a one way clutch and how to manipulate the regular clutches. It's a big project, but will be awesome fully printed. (well somewhat small). A U140e transmission (plagued with problems).

[flyfishingmanchild]

Monster trucks use these inside the wheels so the planet carrier is fixed, the sun gear is attached to the axle, and the ring gear is bolted to the wheel since it puts so much stress on the engine to rotate the huge tires.

[sethpolevoi]

I think the table is misleading. Those ratios only work for a planetary gear systems with the same number of teeth on each gear.

I made a clock with a planetary gear system and the sun to plant ratio (with the ring stationary) is a 6:1 ratio

[tedreaves]

I know this video is not new, but haven't seen it yet. As a retired Automatic transmission repair technician, I found the video fascinating. I wish I had this video when I was training younger techs. There is one thing I want to mention, however. The gear ratios are calculated by a formula that uses the number of teeth of the ring gear and the sun gear; the planet pinion gears themselves only transfer motion, and the gear tooth count does not affect the ratio. For example, in your model the number of teeth on the ring is 49, and the sun is 24. To get the Reverse ratio, divide the ring by the sun, (49/24) for a ratio of 2.04:1; for a forward reduction where the the sun is held, the ring input, the carrier output, the ratio is the sum of the ring and sun gear divided by the the ring gear.((24+49)/49) In your model the ratio would be 1.49:1 Your overdrive is when the sun is held, the carrier is input and the ring is output; the ring gear count is divided by the sum of the ring and sun, (49/(24+49))for a ratio of .67:1.
Nice video!

[ladamyre]

When I was an automatic transmission tech back in the 90's, I thought (and still do) that the coolest transmission was the 700r4 (the same gearsets used in the 4T60, 4T60E and 4T65E). Using only two planetary gearsets, it achieved 4 forward speeds (4th as overdrive) and reverse, and was the most compact 4 speed transmission of the 90's.

[ParadoxThePsycho]

The thing that people don’t understand about the gear wars is it really was never about the gears

[drumeshopeth]

The leaking superglue was a plot twist i did not see coming. Out of left field. Really threw me for a loop. This is great cinematic storytelling. Nice little subplot to the overarching narrative.

[MagicINFJ]

BUDDY!... I have been in automotive business my entire life and have increasingly seen this gear setup used in one more places over the years. Due to the detail and explanation in this video I can totally see why! For the first time! Brilliant! Thank you so much - so very sincerely

[robertheinkel]

When John Deere came out with their power shift on the tractors, the 6 to 7 or 7 to 8 shift was very harsh. The dealer advised that was because one of the planetary gears, had to switch its direction of rotation, to complete the shift. Now it all makes more sense.

[NdumN]

I don't know how it works in fusion 360 but in onshape there's a setting for backslash in the gear tool which makes it really easy to change the tolerances... Great video btw!

[supertramp]

Another amazing feature of the planetary gearbox is the amount of torque it can withstand, due to the large amount of contact of gear teeth.

[cwvid]

Thank you for this video. It is informative and inspiring. For 40 years, I've wanted a special planetary gear design, made from lightweight materials. With modern technology, software and 3-D printing, maybe I can now make it myself.

[joeyager]

Retired machine designer here: Don't know how you modelled your gears, but you can download exact CAD models in several formats from gear (and other components) manufacturers or suppliers. Saves a lot of construction time and the 3D printed parts should fit the first time. A simple pencil sharpener is 2/3 of a planetary gear drive; the planet carrier is spun by the handle, the planet gears are rotated by the stationary ring gear. The cutters are attached to or are part of the planet gears. No sun gear is required for this.

[nghtbot]

I think making inner handles' ends longer than the outer ones would make it more comfortable to rotate.

[robotnoir]

This a cool project, but I still have a couple of questions...

How did super-gluing my gloves to my hands assist the gears?
How do I remove the gloves now? (You did that bit off-camera!)

[RealAadilFarooqui]

This is by far the best planetary gear system explanation I've ever seen

[sreeser]

I've always preferred to use other adhesives like contact cement over superglue. IME superglue is *exceedingly* effective at sealing its own container shut, and it's nowhere near as good at adhering anything else.