Why Harmonic Drives Are Awesome.

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Today we cover Harmonic Drives, Planetary Gears, and Worm Gears.
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Notes:
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[@mickeyfilmer5551]

I have to say Jeremy, you are a brilliant example of a self taught engineer. You have conveyed so much info, in such easy to understand format, that I am sure (and hope) you have inspired dozens, if not hundreds of young people to take up engineering- especially robotics - as a career. I'm and old school engineer, who learned my trade "at the bench" mostly, but nowadays KZbin is a big factor in teaching people. Keep on doing what you are already a master at- and I am sure many more young potential enginners will get the inspiration and confidence- just because of you - to take up this subject as a either a hobby or a job. Well done Sir!!!

[@robert5]

Jeremy, you are a brilliant example of a self taught engineer.... And, this is why Jeremy's videos are so appealing to me and all the other "backyard" engineers. Watching Jeremy expands my realm of what I think I can do. LOVE watching what Jeremy does.

[@ryszb]

Worm gears can be quite precise at high reduction ratios, but it comes with a price of small teeth and low max torque for the size. Gears like that are often used in telescope mounts.

[@JeremyFieldingSr]

Thanks for sharing.

[@carneeki]

They can be used in high precision applications like rotary tables on a milling machine where the worm is mounted in an eccentric and "cammed in" to the gear, which is how the output can also be disengaged for quickly setting up the rotary table. It won't eliminate the backlash, but it can be minimised. Typically you would only operate the input wheel in a single direction and clamp the output so the part being milled won't be shaken about in the backlash.

[@ryszb]

The backlash can theoretically be (mostly) removed by creating a ball worm gear (similar to ball screw). It should offer reduced backlash and higher efficiency compared to normal worm gear. I found some patent applications and prototypes, but no finished product. I guess it is too complicated and expensive fot it's performance or there are some other downsides to this design. Regardless I like this concept ;-)

[@gljames24]

I need a stepper reduction for an optical system and someone already mentioned a worm gear system so I'm glad to see that confirmed. Thanks!

[@jasonpatterson8091]

Harmonic drives are coming into vogue for mounts - there are half a dozen new models introduced recently because they're so compact and lightweight compared to worm driven mounts. The torque is high enough that they often don't need counterweights at all.

[@esrAsnataS]

Kids don't realise how lucky they are to have people like Jeremy teaching them engineering. I'd have sold one of my brothers kidneys to have this when I was younger.

[@raav2878]

it's not too late. it's never too late.

[@The_Flying_Yeti]

And then still, Most of them would rather watch some idiot dance on tiktok 🤣

[@OsoMagna]

Absolutely agree. Fesz electronics, Eddie Woo mathematics are 2 other examples. One can self-educate now. I wish some forward thinking university would step up to coordinate areas of study built around these and other online resources, and then certify students that successfully test-out on those areas of study.

[@Scriven42]

You nerding out over taking that gear apart is pure joy.

[@brunonikodemski2420]

I'm one of the engineers for the actual Lunar Roving Vehicles, made by General Motors and Boeing. Harmonic drives were used on all four wheels, and were used to be able isolated the DC brush-motors from the vacuum on the Moon. Brushes do not work well in vacuum, since they are lubricated on Earth by a thin film of water, from the humidity. On Moon there is no H2O, so the brushes turn to dust and wear rapidly. The motors and the harmonic drives were half-pressurized with a partial atmosphere, with a specific humidity installed. Garrett-AiResearch did the motor assembly. Gear ratio was about 80-to-one. Motor turned up to 19,000rpm max, but usually ran at less than half of that during actual on Moon motoring. The drives would work just fine if somebody went to the Moon and energized them, but the wheel brakes are probably locked-up now, due to vacuum cold welding, so the vehicles probably could not move.

[@dfriendperc]

Very cool! Thanks for that.

[@jimsvideos7201]

Fun fact, big radial aircraft piston engines often had planetary gearsets on both ends of the crankshaft. The prop gearbox reduces the speed to keep the blade tips subsonic and the supercharger gearbox increases speed.

[@notsam498]

Makes sense, auto transmissions are often the same. An old school automatic 4spd transmission is essentially multiple sets of planetary gears that can sync up in different ways to give you different drive ratios.

[@theantasist]

Thanks for taking the time to disassemble the planetary gears. Great video!

[@theeucguy]

In a bicycle hub gear system, several types of gears are used to facilitate smooth and efficient gear shifting. The specific types of gears typically include: Planetary Gears (Epicyclic Gears): This is the most common type of gear used in hub gear systems. The planetary gear setup consists of a central 'sun' gear, multiple 'planet' gears that rotate around the sun gear, and a 'ring' gear that encircles the planet gears. This arrangement allows for multiple gear ratios in a compact space within the hub of the rear wheel. Sun Gears: These are the central gears around which the planet gears revolve. Planet Gears: These gears revolve around the sun gear and are mounted on a movable carrier which rotates them around the sun gear. Ring Gear: This is a large gear that encircles the planet gears, typically fixed to the hub's casing. Clutch: A mechanism used to engage or disengage various gears to achieve different gear ratios. Shift Ring: Used to change gears by moving the clutch to engage different combinations of these gears. Hub gear systems are enclosed within the rear wheel hub, protecting the gears from dirt and moisture, leading to less maintenance compared to traditional derailleur systems. They offer a range of gears suitable for various riding conditions and are particularly popular on urban, commuter, and utility bikes.

[@marko5766]

Not an engineer here, my usual method for disassembly of something new is brute force & ignorance. It warms me to see an experienced engineer use the same method! :)

[@StubbyPhillips]

Regarding the Space Mouse, *ABSOLUTELY!* Having it on my viewport camera *_(NOT the model!)_* is an absolute MUST HAVE now. It makes it SO easy and SUPER FAST to zip around and view things from anywhere in 3D space. It's also really satisfying to just fly around using a 6 axis controller. Also try it with Unity and Unreal and Google Earth and Elite Dangerous and... I see people doing things in 3D without one and feel a little sad for them.

[@tracyrreed]

I attended the SIGGRAPH conference in Las Vegas in around 1991 or so and saw one of these for the first time. The hardware was ungodly expensive back then. The concept disappeared for many years and only recently seems to have turned up again.

[@f.k.burnham8491]

Jeremy- You are a great teacher. Thank You for all the effort you put into these videos.

[@cornpop7805]

I used to work for a manufacturer of industrial robots. So, I have replaced many gear reducers, including harmonic, rotary vector, cyclonic, and another antiquated type I can't remember. We only used harmonic on the minor axes of small robots. Once you get to 6kg capacity robots, the major axes are RV (rotary vector) reducers. On 50kg capacity (and above) robots, no harmonic reducers were used. From there up, we used RVs. I know this is true for the two major Japanese brands. I'm not sure what the European manufacturers do.

[@JeremyFieldingSr]

That is consistent with what I have seen as well. I had one on my desk as you saw but didn’t mention it was used in robotics.

[@CatNolara]

Never heard of RV reducers, really have to look those up. I heard Harmonic Drive reducers have issues with longevity, the flex spline tends to break in the roots of the teeth at some point. Edit: seems like those are the same as cycloidal drives, right? Didn't hear them called that before, but I am familiar with those afterall.

[@cornpop7805]

@CatNolara Look up a KZbin video called "The Nabtesco RV Principle". It will give a description and animation of its operation. I understand them a bit better than this video can describe, but it's too difficult to describe with words. Hopefully, you get the concept through the video. There is nothing flexible within this drive (gear reducer). This is precisely why I have replaced so many of them. If you put the wrong grease in them, everything shatters. This is because there is maybe 0.0001" of clearance between the sprockets and the pins. Thicker grease creates too much interference, and things shatter. Contrary to what the video shows, the pins don't rotate along their axes. All the pins are mounted stationary to the outer plate. For some reason, the video shows all the pins rotating around their own axes.

[@oasntet]

@@cornpop7805 Seems not terribly difficult to grok; it's much like a strainwave gear, but instead of deforming the cup to engage teeth, it uses a cam system to move the inner gear. And those cams can be very beefy and spread the load out across many bearings, rather than just the point load behind the teeth.

[@cornpop7805]

@oasntet I suppose you could call them "cams", but I see them more as sprockets. But, instead of the rollers being attached to chain, the rollers are replaced with rigid pins. Also, there are 3 sets of sprockets, each running off center (eccentric) on their own bearings. The three sprockets are timed 120⁰ apart from each other. The sprockets are not all on the same plane, they're kind of stacked, in reference to the center input shaft. The output is basically the body of the reducer, which is the largest casting. The smallest RVs have two sets of sprockets. Regardless of how many sprockets, each sprocket only pushes on one pin at a time. The output is always fairly low speed, but high torque. There is actually double reduction, the input gear to the sprocket(s) ring gear, and the sprocket(s) to pin reduction. There is significant backlash between the input shaft and ring gears, but that backlash is mitigated by the final gear reduction. The resulting total backlash of the reducer is usually less than one arc minute (1/60⁰). Some are as low as 1/180⁰.

[@kyleeames8229]

<a href="#" class="seekto" data-time="542">9:02</a> Wow! The confidence on display here is remarkable. Yeah, you were hesitant to begin disassembling it but you’re not even organizing and labeling all the parts as you remove them! I recently helped my brother disassemble his desk fan for maintenance and cleaning. Labeled every screw, bracket, etc. I was absolutely terrified of losing parts or reassembling it incorrectly. I’m sure glad I did it though. He was considering buying a new one and the last thing we need is more plastic in a landfill.

[@Redbonegapeach]

My favorite part was watching you take apart the gear box for the first time, with real live reactions 😂. ❤

[@TheCynical0ptimist]

Very cool! I watched this through the lens of an amateur astronomer where these gear types are used in robotic telescope mounts. Most of the consumer grade mounts are worm gear and belt based, but there's a lot of excitement around harmonic drive based mounts that are coming onto the market, especially for lightweight, portable setups. In either type, terms like precision, backlash, and periodic error are important to consider, especially for astrophotography where sub-arcsecond pointing precision is often needed. Thanks for the awesome videos as always!

[@samwillard5688]

Fantastic view of the harmonic drive; I have been wondering. Good to see you.

[@scruffy3121]

Nice Video, My favorite "gearbox" is the "Constant speed drive" basically two axial hydraulic pumps acting as a gearbox to rectify for older aircraft generators. That thing is just amazing.

[@Chris-bg8mk]

I was doing robotics at Carnegie Mellon in the late 80's and early 90s and I do like strain wave gearing as well. I would propose a slight revision to your description of precision. You seem to equate it to a lack of backlash. I'm sure you know this is a gross oversimplification. We were trying to do some very high precision work over long distances and this magnified the imprecision of the strain wave gearing. It turns out that due to the mechanical drive of the flex spline, there is a tiny sinusoidal error added to the output, in addition to the gear ratio function. We were measuring the input and output positions very precisely with resolvers and could characterize the transfer functions of each gearbox. Love this series Jeremy, THANKS!

[@JeremyFieldingSr]

Indeed it is a over simplification, but I still think appropriate for the conversation here. The series is a introduction to the gear types and why you would generally choose one over the other. There are many exceptions and what ifs to each gear type that would have been way too much for this series. Thanks for the input here. I love it when experts add detail and value in the comments. We all learn from each others experience that way.

[@teresaellis7062]

I am SO glad I found your channel. I need to show this to my son. He loves working with mechanical items. This video will make him so happy! I try to follow along with what he says, but my goodness, a lot of it goes over my head.

[@azyfloof]

My first encounter with a strain wave gear was, of all places, in a Lego Technic motor. Part 2986. It was part of a multi model kit that came out in the early 90's I took the motor apart cause I was fascinated by how small it was (I think to this day it's the smallest motor to be produced by Lego) and was amazed by the TINY coreless motor and microscopic gearing. it was fantastically engineered!

[@ladamyre1]

One of my favorite uses of the planetary gear-set is the Sturmey-Archer 3 speed bicycle hub patented in 1903. It used ratchets to give an underdrive, one to one and then an overdrive giving the bicycle 3 speeds. Later a coaster brake was incorporated into the mechanism eliminating the need for a separate brake mechanism for the rear wheel. However, being a retired ASE Master Technician who ended his career as an Automatic Transmission specialist, my absolute favorite use of planetary gears is in the 700-4R/4L60 & 75 transmissions used in GM vehicles in the 80's, 90's and 2000's. Unlike all other 4 speed overdrive automatic transmissions, the 700-4R design, which continued in the 4L60/75 transmissions, uses only two planetary gears to achieve 4 forward speeds and the requisite reverse gear. All other automatic transmissions used a 3rd planetary gear-set to get overdrive. It's one of the tightest and most compact automatic transmissions ever designed and it was a huge success, once all the bugs were worked out, most of them lubrication issues.

[@matthewweaver1123]

I used to work in a printing facility, and was part of a crew that worked on a Heidelberg Harris m3000 printing press. There are some really really neat things about different parts of the press, but like you, one of the things that fascinated me the most was the harmonic drive used to set timing in the folder. It's been years so hopefully I'm remembering the details correctly, The cutting cylinders and delivery fans were driven by a 40 ish horsepower motor. The cutting cylinders were driven directly by the motor. The belt that drove them then continued downward and wrapped around the outer ring of the harmonic drive and the fans were attached (through additional gears and shafts) to the cup side, the eccentric side was coupled to a small motor that would freewheel when timing was good and rotate it faster than the ring or slower than the ring when timing needed adjusted which would advance or retard the fan timing relative to the cutting cylinders. Seeing the gear train and the harmonic drive opened up for maintenance was quite impressive to see in my early 20s. Thanks for doing this video. Very cool

[@davidk1061]

Jeremy, you're the very BEST!

[@Steve_The_Ignorant_Astronomer]

I'm glad you reviewed the strain wave gearing. I'm an amateur astronomer and I've been looking into telescope mounts that are using stream wave because they can carry so much weight and the backlash is basically nothing

[@FrankBenlin]

I love my Space Mouse. It's as close as you can get (right now) to having your hands on a digital model. Thanks, Jeremy.

[@Thebritcoll]

Well I didn’t need to know this for anything in foreseeable future… but you are a great teacher and i really feel like I learned a lot about gears. Can’t wait for this to come up randomly during conversation at some point in the future and feel knowledgeable.

[@cymeriandesigns]

When that part went flying out of the planetary gear as you disassembled it, I got a flashback to old AvE videos.

[@greggc.touftree5936]

Can't believe I was blessed with a J.Field video this morning. Sankyuu.

[@christophergrove4876]

🇨🇦/🇺🇸... Hey there Jeremy! In the past I've enjoyed your many vidz about electric motors. While perusing for information about gears, looked what KZbin tossed my way. EXTRA BONUS... I had already been looking at and considering the Space Mouse and so I figured I'd give YOU the affiliate click and get the 10%! EXCELLENT! I'm quite excited!!!! Cheers, bro!

[@chiparooo]

Very cool! Thanks for sharing!

[@matthewlazaric3543]

Just came across your channel, the enthusiasm you have is infectious. Very good video

[@shanealexander9952]

One of my favorite content creators!

[@stefanschneider3681]

As a hobby-astrophotographer this was very interesting! Because these harmonic drives have really introduced themselves in this area. They are installed in the mounts, that's where the telescope and camera are mounted on and correct for the rotation of the earth to allow long exposures. Thus they have to be very precise, but also withstand some pressure. Because a large telescope with a dedicated astrocamera, a second little scope and camera for guiding, an automated focuser, a filterwheel etc. can add up to quite some weight. But it makes sense why they are more expensive, because as you said: The machining and the material seems to be quite unique. Thx!

[@dirtapple1716]

Hey there, I'm an IT manager at a construction company, all of our cad guys use the space mouse, and the keyboards/mice. I am just starting to deploy windows 11 to our machines. Had a guy who was having the weirdest issue with the photos app, where it would just crash when trying to open a photo. My guys couldn't figure it out, so I stepped in; the faulting module was the space mouse driver! So keep that 3dconnexion software updated.

[@dansv1]

I first heard about harmonic drives when reading about the Apollo lunar roving vehicle. Each wheel had its own motor and harmonic drive.

[@bowieinc]

Who else goes ahead and clicks “like” right at the start because you know you won’t be disappointed and don’t want to accidentally forget to support Jeremy?

[@propertystuff7221]

Wowzers! I've never even heard of harmonic drives except as technobabble in sci-fi. But to see the real thing in motion is a thing of beauty!

[@kevinbowker2385]

Thank you Jeremy! It's always a joy to learn from you.

[@jdbergan]

Taking that gear apart was a good move. Really helped me visualize the concept.

[@SGT_RPGames]

As always, I love your way of explaining everything in a way that makes it easy to understand. Thanks for making learning fun and engaging 👍

[@Hertog_von_Berkshire]

Thanks for the video. A great set of explanations.

[@treepop1550]

Haven't seen your channel for awhile, glad to see your progress and number of subscribers!!!

[@Speeder84XL]

Really interesting! I hadn't seen that one before (the harmonic drive)

[@GrandePunto8V]

It's almost useless. Limited to low power and not critical applications. Sensitive to overload = it cracks.

[@joels7605]

Excellent video good sir. I really like your instructional videos.

[@hansnoeldner1861]

Yet another excellent instructional video!

[@rodin4429]

Love your videos. Your enjoyment in it is shared and spills out in every video. It's not often I mention the sponsor used in a video, but 3DConnexion Space Mouse is amazing. SOme years into using one, I just can't believe everyone isn;t using them ( I am sure 3DConnexion thinks the same - LOL)

[@davidblake5603]

Great video and very instructive.

[@michaelcima5772]

great video. Keep them coming!

[@sams5803]

Jeremy I love your content! I am sooo happy you’re still doing this!!!!!

[@JeremyFieldingSr]

Welcome back to the neighborhood LOL. Glad to have you

[@tomperkins6389]

Jeremy you are a master communicator. Thank you.

[@johnnickerson6522]

Thank you very much. I'm usually entertained by KZbin videos. I rarely learn something completely new. You have added to my knowledge of the world.

[@TNBen60]

Well done!

[@YodaWhat]

@JeremyFieldingSr - Also offering large ratios in a compact package is the Cycloidal Drive, which gives *wide-ranging SMOOTHLY VARIABLE ratios.* It was invented and demonstrated by an Australian mathematician, apparently in the 1980s. It operates by taking advantage of the fact that cycloids are very nearly circular in a small part of the bumpy curve, so the mechanism cuts out those parts and stitches them back together in a system slightly resembling a planetary gear set. If I recall correctly from the magazine article, a *ratio range* of at least 1600 was easily achieved, variable between a small speed increase and a much larger reduction ratio. Definitely both extremes and everything in between were easily accessible and continuously adjustable on-the-fly by way of a single lever. The unit also acted as a clutch when that control lever was pushed _beyond max reduction_ ratio. But I never saw or heard more of it, _and I want to!_ Seems to me it would make a fascinating video for your channel. Can do? Secondly: Is it really _necessarily true_ that in the Harmonic drive there has to be a _difference of exactly 2 teeth_ between inner and outer? Never more than 2, never less than 2? Because I have excellent visual imagination (including animation) and it seems to me that other _difference numbers_ should be possible, with appropriate changes to other components. I speculate that those versions are not seen because they offer ratios that are always lower than with difference number=2, so those lower ratios are achieved by re-designing the whole drive. Makes sense to you?

[@dfriendperc]

I’m no engineer but wouldn’t a more tooth difference require a smaller inner gear and thus the outside would have to flex more causing more metal fatigue? Though I imagine tooth size and overall diameter difference might make more than a 2 tooth difference possible. ??

[@rickmiller1425]

The video of the pancake drive did a great job showing the deformation of the gear. Very cool demonstration, thank you!

[@vog51]

I hate how youtube constantly redirects you to other videos and ignores your subscribed videos on your main page. I'm glad I found you again. Great video!

[@RoboCNCnl]

Great video ! Love your 3D connection, I have the small one and can not work without it anymore...

[@hakonthorvaldsen4263]

Ten thumbs up Jeremy. Keep imparting your knowledge. You have an ability to convey knowledge that is absolutely fantastic.👍👍👍👍👍👍👍👍👍👍😎

[@chriscord6524]

This is the first I’ve seen of your stuff. You’re good, I love gears. I build rc rock crawlers just to learn about the lockers and trans systems. Subscribed.

[@JimPekarek]

I have a 3D Connexion Space Mouse, and can confirm they're invaluable for 3D modeling. A little pricey, but high quality and worth it. Super cool they sponsored you, and thanks for the excellent content. I'm learning a lot about gear design from this series.

[@stephengreen3566]

I learned a lot, thanks. Great video.

[@leewyton7975]

Very slick, I did not know about Harmonic drives !!

[@AlanJWolfe31]

Thanks!

[@ottopartz1]

I took a random chance on the algorithm and clicked on the video. Your enthusiasm and way of explaining things has earned you a neew subscriber.

[@joshm3342]

Thank you!

[@warrenjones744]

You mentioned stacking planetary gears to get the desired ratio and output. Hydraulic excavator swing gears are an excellent example of that. Depending on the size of the machine there may be one or two swing drive housings with three or four stacks aside to achieve that number. Planet drives are very cool.

[@tdkwhois9563]

Thanks for the sacrifice and lessons :) For science!

[@hottractor1999]

Very interesting, i don't really know anything about the different kinds of gear you were talking about, so it was all new to me. Thanks for the explanations.

[@JeremyFieldingSr]

Great. You would enjoy the first episode more. It is an introduction to gears overall and I also talked about the most common gears in that one. It’s a better place to start this journey 😁. This video assumes you saw the first one for the basics

[@enriquekahn9405]

That butt-clenching moment when he takes the planetary gear assembly apart and then you wonder if it can be put back together...

[@user-ix1nj2pp3w]

Keep up the good work uncle Jermy

[@crchuckh6852]

as always very interesting, thank you for sharing

[@The_Flying_Yeti]

Thank you.

[@mudnducs]

You do a fantastic job!

[@henrycarlson7514]

Interesting , Thank You .

[@lenellis8401]

I throughly enjoyed your video.

[@AlarKemmotar]

I've been playing with nutating gear trains recently, and they operate on a similar principle to the strain wave gears, where a small difference in the number of gear teeth leads to large reduction ratios.

[@davidladd5597]

I saw where somebody was proposing to use a planetary gear, on an ebike, with a disk braking mounted to the body of the “gearbox” to allow the bike inertia to drive the motor. By slowing the body of the gear housing, using a hand controlled disk brake, it would control how much regen took place vs the disk. In addition to putting the downhill energy back into the battery, you could augment the braking force with the disk, or even fully depend on the disk, in the event that something failed in the regen circuitry, or the motor open-circuited for whatever reason.

[@dcolb121]

Love this guy.

[@ericjon262]

That was bonkers cool!

[@AugustusTitus]

Dude, your description game is on point.

[@rickanna8662]

Great channel! I graduated from two famous universities with two different engineering degrees. Every time I watch one of your videos I ask myself, why wasn't I taught that in engineering school? Kinda frustrating.

[@JD2jr.]

Yo, a spacemouse sponsorship is awesome. Been wishing for one since I first saw one. Need to get them sold in big box stores so I can play around with one

[@MitzvosGolem1]

Excellent channel 👍

[@dantennison1153]

Good job

[@scottotterson3978]

I learned a lot.

[@GlutenEruption]

It still baffles me how harmonic drives are so smooth and free. You would think the elliptical bearing having to actually deform the cup would make it stiff to turn and add a ton of resistance but somehow it doesn't.

[@H34...]

At a guess, its because turning it doesn't cause more deformation, just shifts the deformation around. Where the spline on one side of the apex takes force from the elipse to deform, the other side is exerting a force back on the elipse while it relaxes. Ball bearings are also a hell of a drug. You can jam a wedge between two surfaces very easily, but getting a wedge to jam between two rollers with ball bearings is close to impossible.

[@neilgarrad4931]

Thanks

[@DavidVerch]

Those strain wave gears were used on the lunar rover as well.

[@NobleValerian]

Gears are so cool. Also, I just discovered the space mouse for the first time a few months ago on another channel and I've been on the fence about it ever since. Your recommendation with the discount finally got me to pull the trigger!

[@NobleValerian]

FYI, I placed my order on the first and got it today with free shipping. That's fast! (but if you don't live in the NE, it probably won't be that fast...) Also, the trainer tool says, "Congratulations! You are now familiar with your 3D-Mouse's basic function." And while my proficiency in the placement game was high right out of the gate, I can promise you that I am NOT familiar with it! 🤣 But it is VERY intuitive.

[@GrundleStiltSkin]

strain waves are used in telescope mounts now. no backlash, but periodic error

[@jthomas3994]

Brilliant :)

[@5cyndi]

Robotic arm looks amazing. Great to save and do it yourself!

[@dannyr3346]

Black Tony stark over here. I love this dude❤

[@JP-xd6fm]

Once you try and get used to a 3dconnexion mouse, there's no way going back! , I recommend the small one as it will be enough for the majority and has a compact size to free desk space. Jeremy, nice you have the chance to be sponsored by a good product.

[@atvheads]

Now the worm gear are used in Cnc machines even today, for A B or C rotary axis in milling machines. So they aren't that bad for precision. And they are rigid strong. But they are pre tighten and don't run at high speed or long duration. And i also use 3dconnection space mouse, @ <a href="#" class="seekto" data-time="793">13:13</a> is price worthy. @ <a href="#" class="seekto" data-time="880">14:40</a> I have made a similar part for an compressed air driven at work here in Sweden, for the industry where electric couldn't be used. It had no motor, but controlled compressed air in 4 chambers 90 degrees apart inside that gear.

[@TonyLing]

Brilliant

[@jakobhansen1396]

Planetary gears with planets output to the driveshaft and a gasoline engine driving the sun. And for regulating the speed an electric motor connected to the ring gear. Not good for reserve driving, but it's very responsive

[@victorriceroni8455]

I just found this channel. I live for mechanisms. Very cool.

[@JeremyFieldingSr]

Welcome to the neighborhood! We are glad to have you. :)

[@samh-smith2931]

You're a legend

[@user-livetoknow]

Omg. This makes so much sense now.

[@Roy_Tellason]

I have a Black & Decker cordless screwdriver and was rather surprised when I went to open it up in the process of replacing the battery. (Do this with the bit pointing DOWNWARD! :-) What I found was a two-stage planetary gear set, which explained how the thing had some nontrivial torque...