Screw/screw gearing

[@sirwilliamkarl5591]

This seems like a solution that has not found its problem yet.

[@henryseg]

That's often how art and (pure) mathematics work.

[@digitaluddite]

@@henryseg I have a folder on my computer titled "Solutions in search of problems." I think this sort of engineering is good practice and frees your brain up for lateral thinking once the real problems come along. One of the files in this folder was a spherical gear, which I never figured out but these smarties did: kzbin.info/www/bejne/npmnlZmfh6iEiZY What would this be an example of? Rotation-rotation-rotation?

[@bobmackay1856]

@@digitaluddite I have a folder on my computer like that, but it has nothing in it! It is a solution to a problem of solutions in search of problems!

[@sirwilliamkarl5591]

@@henryseg Then I think my art has yet to find its problem.

[@isaacm1929]

It's perfect for making 45 degree holes in a production line. One piston, and two drill tips. Also, for a vault lock.

[@MushookieMan]

In kinematics, when you choose a different part of the mechanism for the 'grounded' part (you called it the frame), it is called a kinematic inversion.

[@PonyCraft]

As a programmer inverse kinematics are really fucking cool and blew my mind when I learned how to... frame... the motion

[@andrewbailey7999]

This reminds me of a modification made to the Archimedes screw for moving grain, where the screw stays stationary and the housing spins

[@blinkx1070]

@@PonyCraft I'm a 3D Animator and we use Inverse Kinematics a lot when animating arms and legs

[@thenatureofnurture6336]

​​@@andrewbailey7999 I saw that too. Didn't that idea proove to be a great deal more efficient?

[@Hogscraper]

@@andrewbailey7999 Tom Scott has a video called Mr Olds' Remarkable Elevator that highlights this idea. Pretty awesome stuff!

[@grahams5871]

I love 'periodic tables' like this. Some are just done stupidly, but when you decompose the the space into orthogonal attributes, you get an amazing pointer to possibly undiscovered items. Your table here shows this ( labeling "screw" with an additional "rotate+translate" label adds a bit of insight ) But it also shows that you have not yet identified all the axes. Look at the rotate/rotate box where you have at least 3 different mechanisms that fit into the same grid location. I think the missing axis ( or axes ?) is angle between the two planes of motion (??) with values 'planar', 'bent', 'yawed' and 'pitched'' If you added another 3 layers to this grid, and added the 'useless configurations ( like your locked up racks ) you'll possibly get a complete set of mechanisms. Color coding 'part A' and 'Part B' might make things clearer. The 'plane of engagement' is another possible axis. Some missing items: in rotate/rotate: you have pane of motion values 'planar', bent and pitched, but are missing yawed the spur/screw item engages on the 'bent 90 degrees' plane, but could engage at 45 degrees bent ( would lock up) or planar ( the spur would have rack holes and the screw would be lozenge shaped) the 3 item screw is probably two items together with left and right chirality somehow, which hints at another axis in rotate/translate: there is a missing rack/pinion where the 'rack' translates up out of the page, and one where it translates away from the pinion in rotate/screw: the handle of the corkscrew could emerge from the screen and twist the handle axis could be an axle aligned top/bottom of screen and used to roll the cork remover to the right I am probably missing some, and I feel I have mistakes above because I probably haven't characterized all the orthogonal attributes correctly.

[@elderfrost9892]

interesting idea, although in practice combinations of any of these and bevel gears can change the axis we're working around. however, a few additions just for thought: a spiral gear would be a good example of a rack and pinion-esque gearing that pushes the rack away from the gear a rack and pinion moving up out of the page could be filled by a worm gear moving a rack, which is yet another way that the adjustable wrench can fit into the diagram, if you look at it from above constant gear ratio, whether or not it can be worked infinitely, and different possible frames of reference are all other possible things to explore, I feel this is a discussion that can very easily get very complex

[@renosance8941]

Do you mind sending me a word documents of this table? 😅 Just so I see if I truly understood what you meant.

[@mezu-e]

These tables brush up against abstract maths that I really wish I could sit down and learn.

[@falkland_pinguin]

The "two ordinary racks" from 5:45 remind me of a safety feature in railway rolling stock, where they add large rack-like panels to stop relative motion along a vertical axis in colliding vehicles. That prevents a situation where one vehicle's frame could slide on top of the other frame and crush everything in the passengers' space.

[@PonyCraft]

Ive seen these on thise little cargo wagon deal, basically a skin made of teeth that fit to the cart, then you could lever the teeth up to keep it rolling.

[@falkland_pinguin]

@@PonyCraft Not quite sure we're talking about the same thing there...

[@calvingoodall2065]

Oh, anti climbers! Aren't they for preventing telescoping?

[@hollt693]

​@@PonyCraft Write a horror story in only four words: "skin made of teeth"

[@PonyCraft]

@@falkland_pinguin I meant to say a skid with teeth on it so inertia won't send the load flying

[@TheDanielscarroll]

This tickles a part of my brain that not many things do. Nice work.

[@celerysoda]

i dont really think i've had much of a previous interest in gears, but the way you explain everything with examples in a calm voice kept me engaged the entire time lol. love it!

[@hexapodium]

The translate-translate gear is *almost* a pair of opposed mechanum wheels, if you were to bend one of the translate gears around so that it loops back on itself. The action of the rollers is as if the floor had teeth at 45 degrees to the plane of rotation.

[@henmich]

The Museum Of Science And Industry in Chicago has a staircase of mechanical movements. I have been fascinated by that staircase since I was a child. I am glad to see people appreciating these topics again...

[@roganl]

Henry, have you considered attempting to build a pliable/flexible version of that mechanism, such that the helical racks conjoined to form a figure eight?

[@--Nath--]

Or a moebius strip each?

[@punpundit5590]

I don't think that could work. As one piece, the rotation and translation when it crosses itself will be opposed. You would need a spur gear between.

[@Greenfire44]

​@@punpundit5590 I'm definitely not an expert on this but my intuition tells me that if they are both Möbius strips then there should be no need for that intermediate spur

[@VEC7ORlt]

Translate-translate gear is actually used in garage door locks, it has irregular teeth on both key and lock if they match it slides freely, if not it binds.

[@MushookieMan]

I can't find that. I only see ordinary pin-tumbler locks

[@VEC7ORlt]

@@MushookieMan It was used a lot in the soviet union, google for 'реечный замок'

[@V4VestA]

Fascinating. My favorite is the mechanism of two ordinary racks side by side; such simple unity and perfection!

[@johnyu1750]

It is very refreshing to see new engineering from people like you. Oh, the wonders of computer aided drafting and 3-D printing.

[@TrajectoryT]

the algorithm has blessed me with another channel that displays interesting and intriguing items

[@takeshia1477]

I really sat here and watched a 7 minute explanation of gear mechanisms, with zero prior interest in the topic. Your videos are great!

[@Kethra430]

So satisfying! Do you think you could make a version of that design that is in the shape of an infinity symbol?

[@fairhall001]

or 2 mobius loops with gears!

[@OlliNiemitalo-g8b]

Wow, I'm impressed by the KZbin algorithm. I had been googling for a helical gear to support at idea level the design of a track for simultaneous translating and rotating camera motion, and that happens to match your last design if we put a regular gear in place of the other helix.

[@thomasrogers8239]

I'm always amazed at what you come up with

[@cherenkov_blue]

Biblically accurate gear mechanism

[@mitralex]

As for the tranlation/translation mechanism in the real world - there are locks with the key in the form of a rod with the inclined grooves and two parallel latches with the same type of grooves in the lock itself. Pushing the key in between the latches you make them move and unlock the door. In our country such locks have been used in garage doors mainly some time ago but not any more as I can tell

[@Scratch31337]

Yep, very popular type of locks in Russia back in the day

[@RichardBreen]

How about the lock mechanism from this video: kzbin.info/www/bejne/pZauf2p-rZ17jKs as an example of a translate/translate mechanism. The door is the "frame" part, and the key and the locking bar are the parts moving relative to the frame.

[@henryseg]

That looks like an example - thank you!

[@RichardBreen]

@@henryseg glad to help

[@FPSG]

Industrial grippers have translate/ translate mechanisms. An air cylinder moves 90 degrees to two jaws causing them to open or close some of Schunk's grippers are made this way.

[@insanimal2]

Ah damn you got there before me!

[@Noxonomus]

There was a video circulating a while back showing a door latch that uses the translate translate arrangement. I can't find the original video on its own, but the Maker's Muse youtube channel has a video about/including it you can find searching "Rack Lock". Apparently they are known as реечный замок and we're fairly common in Russia. There are quite a few videos in Russian of commercial реечный замок but most of them show more enclosed factory made units, I haven't found any that show the mechanism as well as the clip in the Maker's Muse video.

[@jurtheorc8117]

I have no idea what i'm going to do with this information, but i enjoyed this video nonetheless. You have a pleasant voice and way of explaining things. Thank you for the video, and I wish you a good rest of your day!

[@Metroyed]

I know there are locks that use a design similar to the borromean racks, but they only use two pieces and a frame. You push one of the racks into the key hole and the corresponding motion on the other rack lifts the latch on the door. The teeth on the racks are irregularly spaced so each key is unique.

[@hidehide-d3g]

The last design is so marvelous!! I have no idea sticks and gears mixed up and do well.

[@echognomecal6742]

I love the idea of someone randomly coming across this & suddenly understanding (Eureka!!!) what they need to do in order to get the idea that they've been mulling over to work.

[@paulriggall8370]

2:10 the translate gear thingy - I found a similar thing the other day when fixing a pair of binoculars that has this zoom thing and you control it with an arm around one of the eye pieces. A thin piece of metal moves along and the same motion is replicated on the other eye piece. It’s so clever, I’d never come across it before and was why I bought the broken binos from the charity shop.

[@NinjaPotatoGaming]

Beautiful gears. it's pretty wild to think how many unimagined mechanisms could be out there. Seems like the variations could be infinite. I imagine interlocking sets of lattices which interact together in beautiful but horrifying complexity There's a purity to the physical representation of relationships between objects and systems, vs proxies through abstractions

[@privatemale27]

Couldn't a "screw - screw" combo be as simple as a screw and the the nut or hole it is threaded into? The perpendicular screw - screw model you made is pretty cool.

[@henryseg]

That would only have two parts, not three. You need a frame part and two gear parts that screw into the frame.

[@AgentPothead]

Great work! That didn't feel like 7 minutes, the time passed very quickly. Great video very informative, glad the algorithm brought me here.

[@FrankTheTank417]

It would be interesting to see the strength and benefits between each of these gears to see which would be better used for certain scenarios.

[@kummer45]

This is the time when learning becomes an adventure again. Let us not forget the AMOUNT of equations, differential equations, that these things have. Inverse kinematics is rigid body mechanics hence classical symplectic groups. The amount of knowledge required for these is fascinating. Lagrange equations, Lagrange Kane equations, Hamilton equations, Hamilton Jacobi principle, Poisson Brackets and Lagrange Brackets. Classical mechanics never stops being fascinating. These videos makes the analysis explicit and understandable.

[@gameofpj3286]

These models are so beautiful!

[@sebbes333]

*@Henry Segerman* 0:00 Can you also bend those in the 3'rd dimension? To create 2 circles that "interlock" at that "intersection", so you can kind of get an "infinitely long" piece of that "gear stick"? Looks awesome :D

[@caseysmith2445]

There was a Russian lock design for keyed gates that was a translate/translate gear set. The key was one rack and the latch was the other rack and the door was the frame.

[@swapertxking]

im not too savy on mechanical engineering despite my fascination with them, but this was a fantastic breakdown of these sorts of mechanisms.

[@sleepib]

I remember seeing a video of a weird lock that was a rack and rack mechanism, the key was one rack, with irregular tooth spacing at a 45 degree angle and the lock had a bolt with the complimentary tooth spacing. I was unable to find the original, but Maker's Muse did a video on it in 2019.

[@mengse00]

You could make them elastic and turn them into a circle like screw and screw forever. Maybe the circle is big but I think it would work when you use a few more frames arranged in a tetraeder way and the circles will rotate themselves around their centerline instead of them rotating 90° relative to the frame in the center and crash into each other. :)

[@Mattz554]

Damn that was really enjoyable to watch 😄 Very clear and concise explaining and awesome visualisation with the Models and real-life examples in tools! I subscribe right away ❤

[@hySunfuls]

정말이지 놀라운 3d 프린팅 공예실력이지 아니할수가 없지 아니한 그런 영상인거 같다 태엽의 간격이 정말이지 완벽히 일치하고 설계를 제대로 하여 매끄럽게 태엽이 서로 상호작용 하면서 돌아가는 모습이 정말이지 아름답다.

[@Surgeeon]

Isn’t the borman racks similar to how the old American battle ship targeting systems used to work ? I could be wrong, I seen a doc on it some time ago but it instantly made me think of this

[@Hexanitrobenzene]

In this age of information technology, I never expected to be surprised by good ol' mechanics!

[@Steve-uu7yx]

That mechanism is smooth as butter, Id love to know how you printed it.

[@henryseg]

I use shapeways.com - it’s printed using a process called selective laser sintering.

[@Steve-uu7yx]

@@henryseg Those sintering machines are so cool, especially the metal ones.

[@randms2fake]

How about Wonderwire? You pull them apart and that forces both screwed wires to rotate.

[@PLMassTahh]

6:00 - idea: corner bracket mount for instalations or even structural element for wood frames. both screws are driven in the material at equal rate ensuring balanced stress within the material. additionally - instalation could be faster because you need to drive only one of the screws. not sure if materials for screws would permit sth like this tho.

[@cubes_art7956]

I love the implicit question in the last clip!! Where does this mechanism fit into the table when one of the helical bits is viewed as the frame?

[@W4iteFlame]

I wonder how much force can this new connection tranfer/hold without failing. Also I think it may have similar application to things, that uses rails to move

[@bukszpryt_]

Corkscrew is a mix of screw and rack and pinion. Screw motion moves the rack, that rotates the pinion. Theer is no direct interaction of screw and pinion.

[@Araxatu]

I have been thinking about a mechanism that could move like this, and now you have bring it to reality

[@fromthegamethrone]

I wonder if it's possible using only screw, screw connections to use gear up/down systems, to be able to move one gear a lot by moving a small gear a little.

[@humanspirit3432]

There is a kind of a metal lathe 3-jaw chuck which uses similar racks to sunchronise its jaws.

[@BenCritchlow]

I would imagine the optimal shape would still be close to the circle involute, but then perhaps bevelled following another involute perpendicular to it? Not really sure. You're right that would make an interesting project particularly if this mechanism saw an industrial application.

[@Hope_Keeper]

Are clamps (/or jigs?) that holds woodworking parts in place or in a similar way a vice also an example for the screw translate type of gears.

[@Psykomancer]

I can imagine the screw/screw mechanism being used as a regulatory mechanism to ensure 2 angled planes move in a rocking motion at a locked speed ratio and only one of them is powered. There is probably a much simpler way of doing it too.

[@stickmanonastick6089]

Would it be possible to take the screw/screw box and make each screw curve in on itself, making two rings? That would be such a satisfying mechanism to hook up to a motor, as it could just keep rotating and be completely mesmerizing.

[@gdclemo]

How would the rings twist around as well as rotate? Unless they were made of lots of near-cylindrical pieces with some sort of linkage between each piece. Or maybe I misunderstand your suggestion.

[@stolenromeo]

I am picturing something with a lateral motion that engages 2 plates separately. As you move to one side, the bottom moves forward. Then as you move to the other, the top moves forward. Like a walking robot that uses offset gears, but with a pair of pistons to push back and forth. Or something two parallel planes need to be moved by one back and forth motion, and the additional rotational force reduces the wear and tear compared to the rack and pinion?

[@ltv..123]

Very nice! As a retired engineer my recommendation is that you patent that t-t gear set immediately. Good luck.

[@AllenKnutson]

If we think about rotation of a verrry big wheel around a very faraway axis, then in the limit we get translation. So the rack and pinion is a limit of the gear-gear link (with either the parallel or intersecting axes). At which point I thought of the rack and rack, which of course you finally got around to at 5:45.

[@cheeseburgermonkey7104]

I was going to say this as well!

[@numbers3268]

i dont know about screw-rotation (maybe just a wrench looked at from the right direction?), but a tool i use a fair bit is the micrometer. while it doesn't have any mechanisms per se, it nevertheless is used to convert screw motion into precise linear motion, for the sake of precision measurement. the thimble moves in a screw motion relative to the frame while the spindle moves-in practice-linearly.

[@FoldingScreenMonkey]

6:41 "I imagine that could be a fun research project" that could probably be a masters thesis

[@darkpheonix77]

would be awesome to curve the twisted racks into a circle. technically it then becomes a overly complicated parallel rotate... but it seems really fun.

[@cliveso]

How on earth do you come up with these endless fantastical contraptions...

[@georgestaniforth9928]

Would two spur gears on oppositely threaded axles be considered screw/screw? Love the mechanisms!

[@benh5336]

you could totally extend the length of those twisting gears around into circles themselves and make some interesting (and artistic) gear linkage

[@aronlinde1723]

Actually a screw screw would be awesome for a lower weight safe locking mechanism. Extension and rotation can make a better lock than just translation from rotation. Similar to the force as rotation and lock mechanism works on modern rifles.

[@glowpon3]

It would be fun to see if you can get different gearing ratios for the screw:screw device. perhaps it could be used in some sort of pantograph type application.

[@Rubrickety]

This one’s a real beaut. And it’s fun to compare with the “ancient”, discolored triple-gears from the distant past. 😉

[@vaughanknight]

For the bottle opener, The screw forces caused by the cork screw are translating the cork screw, and that translation is moving the gears, not a screw motion through the gears. It's the same gearing in both action. Just because it's spinning in the gears, doens't mean it's moving by screw gearing, which is why it works in both directions as translation..

[@Studio_369]

Lovely as always Mr. Segerman!

[@Misophist]

There is yet another tool, that fits the rotate/translate box as well as the translate/screw box, depending on which of its elements you fix in your hands. The _Archimedes drill_ a bit outmoded, but still available!

[@henryseg]

How many rigid parts does the archimedes drill have? From looking at a couple of pictures it looks like two?

[@Misophist]

​@@henryseg Maybe a video explaining its use helps: kzbin.info/www/bejne/mH7Ci6Gro62KgNU - or - kzbin.info/www/bejne/o3evc4l_e5KrhK8 -> it is two parts in total. In the rotate/translate box, _both_ are moving. There is no cage, unless you consider the collar, that does the translation, to also be a cage. You might also consider the piece you rest it against, in order to drill the hole, as a replacement for the cage. In the translate screw box, it gets even weirder, you fix the collar, the wight of the drill alone will cause it to screw through it - which means: the translation is actually zero, still the drill itself screws under is weight.

[@justinklenk]

Mesmerizing and fascinating. Subbed, sir.

[@HarbingerOfFear]

Biblically accurate gearbox.

[@Aleroski]

I dont know how I ened up on a video about gears and screws...but good stuff. Well deserved like.

[@legolava3265]

You can make really cool artistic elevators with these mechanisms

[@Charm_Dragon]

At 2:24, there is similar mechanism to your Borman Rack called a "russian rack lock". It uses a similar sliding mechanism as a lock because they work in cold weather.

[@Frieren_Lienel]

OMG HOLY SHIT, GOD OF GRARS, OMG, THAT FIRST MOVEMENT WAS SMOOTH AND PRECISELY MEASURED AND SHAPED, WITH A MATHEMATICAL SOLUTION FOR ITS MATERIAL AND MEASUREMENTS

[@JacobL228]

Every engineer watching this is letting out a satisfied sigh right now.

[@charliecarpenter2840]

The Boreman racks remind me of a 50's mechanical naval firing computer. Looks like a coordinate system

[@SurprisedSyrup]

1:20 thanks for the advice, wife says shes pretty impressed

[@Spiderslay3r]

at the point of contact the screw gears interface like two spur gears, I would assume the ideal tooth profile would be a standard revolute of the projected radius of the gear.

[@vladko312]

Translate-translate is used in some garage locks in Russia. It is a very old design, but it is still manufactured. The key is pushed (or inserted sideways, rotated and pulled) through a hole and the "teeth" on the key interact with the "teeth" on the springloaded locking bolts, retracring them. Secrecy is achieved by the angle and positions of the teeth.

[@--Nath--]

I kinda feel like a hills hoist clothesline mechanism might be interesting to add to the diagram. It's an Australian thing, but I think it has some different modes depending on where you fix it..

[@tuskiomisham]

Hello, Mr. Segerman, I'd like to propose a fishing rod with a spinner bait as a popular screw-screw translation. Here is why, When you reel in a fishing line, the reel spins and bobs up and down, winding up the line while maintaining an even spool of line. This is the first screw motion. it is oscillating linear, and constant rotational As the line reels in, the lure's spinner will also cause the the lure to travel in a corkscrew motion, spinning as the line is reeled in. This is the second screw motion. It is constant linear and constant rotational. I hope this fits the bill, it certainly seems to fit to me.

[@The1Helleri]

With the screw-screw gearing, is there a limit to the angle one is at relative to the other? Must they be at a right angle to each other or can they be obtuse on one side and acute on the other? If so by how many degrees?

[@henryseg]

Good question! I'm not sure.

[@The1Helleri]

@@henryseg Well tag me if you at some point decide to find out in video format.

[@boastfultoast]

Easy - just find the involute of the twisted helical sine wave complex geary thing 😅😅 Great video - simplistic editing and well thought out dialogue make it a pleasure to watch

[@JJSquirtle]

While I can't confirm if it was a screw-screw mechanism, my drafting teacher in highschool had a special adjustable squaring tool for faster square plotting that had a screw as at least part of it as you would rotate a knob and the x and y axis would create distance or close it at the exact same time, assuring you were tracing a square. He said it was a novelty antique he found back in the '70s. But it was less practical than the ruler built into a drafting bench for a multitude of reasons.

[@FonetBeats]

Can the twisted helix parts be round, so the mechanism can continue infinite in any direction …?

[@NathanRae]

Can the screws be formed into hoops by joining slightly flexible sections together? This means you string two or more hoops in a chain, all moving continuously powered by single motor. It would look amazing and break people's brains.

[@henryseg]

Maybe? Flexible parts are harder to design than rigid body geometry...

[@KristofferEk]

i'm more curius about what aplications those helical racks could have. I only thought some sort of crusher or bucket opening mechanism.

[@hexane360]

I'm not sure the rotation v. screw distinction is that useful in practice, for reasons that the wrench example makes clear. As another example, a leadscrew screws if you hold the nut fixed, while it rotates if you hold the bearing fixed. What's much more interesting to me about your mechanism isn't that both elements are screwing, but that they're screwing along different axes

[@henryseg]

Right, there’s a whole other side to this that I didn’t talk about - where the various axes are. The adjustable spanner is a very special case in that the various axes are all identical.

[@jessesohn]

Hi, I’ve always wondered when watching your videos which software(s) you use to produce your models. I would really love a behind the scenes, or better yet a how-to tutorial to translate an advance mathematical concept into printable geometry.

[@henryseg]

I use Rhino3D and its scripting language Grasshopper. It’s difficult to do a general how-to, since there is so much variation between different projects.

[@brendonmoore3505]

I’d be super surprised if I ever see one in a real world situation. Really neat though, I appreciate the brain power behind it 👍

[@audreyprimate]

the first clip makes me happy

[@chywn]

What about zips? If we consider the zip handle as the fixed point, The teeth are parallel on one side but diverge off axis on the other.

[@RegebroRepairs]

This reminds me of Polhems Mechanical Alphabeth, a 17th century effort of making a library of mechanisms to translate every motion to every other motion. Although I don't think he saw "screw" as a motion.

[@bpark10001]

The shape of the gear teeth for the screw racks is an involute. The hard part is determining the radius of the pitch circle. That will do for infinitely thin rack. The finite-width rack will be that curve widened along the screw plane.

[@xpherion6571]

I don't know of any real world machinery that uses screw gearing however it can be applied to piston engines by seating these gears in the piston free to rotate so that the fixed oscillating motion can translate into rotational motion that can then be used to spin and drive magnets in an alternator system to generate more electrical power for other uses. correct me if I'm wrong but if my understanding of the gear is correct it can actually be set up in an array with four axels facing in different directions so long as its helix is oriented correctly meaning they can also have more inputs to counteract the torque stress on the teeth of the gear

[@tymz-r-achangin]

2:28 The only think I could think of is that type of gearing could be used for locking mechanisms such as maybe the door on a safe

[@armandotoglia]

Wow!!!! This was such a beautiful and genius video!!!! Thank you!!!

[@jlipdl]

I like how you can explore diferente way, out of the box... it's very interesting....

[@archmagemc3561]

Hm... not sure where you'd use this type of assembly, as you can get a transition to rotation type of exchange just using a rack and pinion + bevel + spur to get this type of exchange using less area and mass. however if you needed to use a transition force to more than 1 rotational forces in different angles at once, thats where I could see this design being useful. Not sure where we'd use that right now, but that is a use case I thought of as this gear assembly can theoretically turn one transition force into infinite rotational angles.