You've Never Seen a Cycloidal Drive Like This

[@Cinema_Mechanics]

Flexispot Black Friday Sale! bit.ly/4eFbsdK (US)

[@russellzauner]

wind this in the right way and this becomes a motor that doesn't need a reducer ;-)

[@TracyNorrell]

I didn't hear "back drive" once!? KZbin videos about cycloidal drive gearboxes aren't complete unless the creator says back drive at least 5 times! 😂 Great video

[@Cinema_Mechanics]

Back drive! ;-). But seriously at these reductions they aren’t so easily back driven.

[@jeremybrouillard]

I do industrial robotics for a living, keep the video flowing. Most people in the industry take the actual robot for granted. I am still there, 10 years in, wowed by the mechanical marvel a serial robot is. I am more on the software side of things. Building tools to program them better/faster. You will certainly have some nice challenges ahead when you get to the control, calibration, motion planning part.

[@alfredias801]

Another interesting variation on the cycloidal drive is the compound cycloidal drive, where there are are again two cycloid gears, but they are attached directly, so without an inner ring. One of the cycloid gears has one lobe less than the other, very similar to how a compound planetary gear works. An advantage is that because it has no inner ring, it can be made very small and with very low part count

[@OleBrouer]

I love that type of cycloidal drive! I’ve actually managed to design and 3d print one that has an outer diameter of roughly 2cm and is fully print in place (its output is not useful and the whole thing is just for show) while still packing a 36:1 reduction!

[@Cinema_Mechanics]

Stay tuned!!

[@chadjensenster]

Levi Janssen on KZbin talked about a compound cycloidal with a smaller inner cycloidal disk inside a larger cycloidal disk.

[@youngpaddy1]

I always wondered how plumbuses were made.

[@jonnymeyer8572]

You should give Fiberlogy CTE HT a try for your functional mechanical parts. Like PETG it is a co-polyester but has almost none of PETG's weaknesses. It prints exceptionally well in an enclosed printer and has no warping or dimensional issues. This stuff is accurate. It's also one of the most strong materials in the FDM world not just because of it's material properties but because of how cohesive it prints when you get your settings dialed in. Reach out if you need filament or print profiles. I print mine on a P1S but an X1C would be better because you can get the hotbed a lil hotter. If you want a similar material but with just a bit more flex, ColorFabb HT is of a similar composition to the Fiberlogy stuff but just a bit less strong. Still exceptionally good in terms of strength but especially the dimensional stability and print cohesiveness. Bonus, the temperature resistance of this stuff is some of the best you can get in an affordable material. Friction heating or heating from your motors will not be an issue with it.

[@Cinema_Mechanics]

I’ve played with some engineering filaments over the years. Mostly CF-PC and while I’ve found that there are improvements. You still have to deal with plastic deformation. I haven’t played with any of the newer stuff yet though. Thanks for the tips!

[@makex_se]

No, the video is not long enough. I WANT MORE POWAAAH!!!

[@herbertattema9890]

Wow, super entertaining animation and original spin, thanks!

[@contentnation]

If it's possible to change the design a bit, the rotating parts seem almost 2D-like, so perfect for cutting on a simple 2.5D CNC machine or a water/laser cutter.

[@chrisBruner]

I love it when I see something that I hadn't heard of before.

[@anon_y_mousse]

Neat. Any plans to make the whole thing out of metal and is this going into the robot arm?

[@dnomyarg32]

I really enjoy your videos. You asked for improvement ideas, and I would love to see you have a go at machining the disks in aluminum on your cnc. That’s one of the big advantages of cycloidals over other high ratio drives like strain wave, planetary, pinwheel worm drives, etc. They can be easily machined on a 2.5 axis system. Even a hobbiest cnc should give better tolerances in aluminum than a 3d printer in plastic, reducing or eliminating backlash and the stuttering. The load bearing will be far greater, improving the torque. And the stiffness will be much greater, reducing the hysteresis. If your little cnc is up to the task, that would be really cool to see.

[@Cinema_Mechanics]

@@dnomyarg32 yep would love to cnc one up in the near future. Definitely gonna have to get those tolerances tight though.

[@dnomyarg32]

@Cinema_Mechanics with 3d plastic I doubt your profile tolerance is much better than +/- .1 mm. I imagine your cnc should be able to do better. Maybe a lot better.

[@rudycandu1633]

If you have a CNC, then make the deforming parts out of metal.

[@TuckerSmith-xm8es]

I’m expecting that to be the subject of, or at least included in, a future video

[@Grayswandiir]

I always love your videos, and im certainly not a medical professional, but your fingers look really clubbed. I could be wrong, but KZbin cant afford to be losing promising new creators these days!

[@gonzog8d]

I was going to make the same comment. Hopefully it's just genetic, and if not he already got it checked out.

[@bryanst.martin7134]

Fiber reinforced PETG? Not carbon as it increases wear. The Oscillation was present at 1st run, and progressed? At 1st I thought too little torque from the brushless. Maybe friction played a big part?

[@coledavidson5630]

Doesn't having a different number of lobes make them not perfectly counterbalance each other? Or do they just need to have the same mass?

[@wesleyturner6424]

im absolutely interested if you can make a compound cycloidal with this same style and have the inner and outer pinstack spin separate smaller within the larger i would be amazed if that would work, honestly cant follow the forces in my head so im struggling to work it out

[@MakerGeek]

One of these days I'm going to have to try one of these, as you say, everyone waxes lyrical about their advantages. for my robot arm I'm using a couple of 3 stage planetary gearboxes which I setup with 4 planets per stage to help with the teeth contact area thing. steel pins through the planets connect the output plates. I've had some decent success with around 50Nm of torque. they're pretty big though, and certainly the sun gear at each stacked stage is a week link. Do you think the stuttering movement you got was purely from the deformation of the plastic gears? I assume that was petg?

[@stimpyfeelinit]

very cool, should put a regular cycloidal drive with the same ratio next to it to show the improvement

[@sovahc]

With the help of wire-edm, it is possible to cut such flat parts from very hard metals. I'm going to try it. As soon as I build the WEDM. 😁

[@Cinema_Mechanics]

Share your results! :-)

[@ferriswhitehouse1476]

switch to carbon fiber ASA filament and that thing will be able to lift the whole gym. top notch video and design skills as always 👏

[@fatihmeral9863]

The video is short, if not the v2,, at least we would like to see the performance of the CNC machined version

[@russellzauner]

whoa...this means a rotary engine is a three lobe cycloidal

[@gustavobastosbarbosa1391]

Hope to see more of your work.

[@Baroque_Back_Mountain]

This is similar to a Gerotor, which, i think is part of a helicopter’s fuel pump system.

[@A3Kr0n]

Thanks for the condescending title. I'm really sick of all the things I've never seen, all the things I've never heard of, and all the things I thought I knew that were wrong. Thanks again.

[@jeremybrouillard]

Another great video! The amount of math was just right for most ppl I think!

[@Cinema_Mechanics]

Glad you think so. I had concerns.

[@jeremybrouillard]

It showed! I would have taken more, but I think it was plenty for most.

[@Lyle-In-NO]

This channel has less than 13K subs. How'd you get an adbertiser so soon? You must have another channel/product out there somewhere already.

[@Max24871]

Would love to see you release those design files in your upcoming video :)

[@Cinema_Mechanics]

That’s definitely the plan.

[@chopper3lw]

NICE!!!!! That's so nifty

[@sobertillnoon]

Ya get less wobble with 3 discs 120° apart.

[@nathantripp9134]

Looking forward to your follow up(s). Thanks for sharing, cheers!

[@TheNadOby]

Nice one gonna check this one

[@twitchlazy]

im not a doctor or anything, but you may want to have them check your heart and lungs. It looks like your fingers have clubbing. Thanks for the video.

[@regun2434]

Ah more video!

[@stefanguiton]

Great work as always

[@Cinema_Mechanics]

Thank you! Cheers!

[@Romeo_the_wise-]

I would like to see this Cycloidal Drive paired with a small drone motor to power an electric bike

[@TankR]

While speed and torque can be exchanged, power is absolute. A watt is a watt no matter what. If it takes say 5 watts to accelerate and maintain a mass at a given speed, and you're not putting at minimum 5 watts into the system (which youll of course have to input more than that for frictional losses in the bearings and contact points, plus rolling resistance, air resistance, etc) there is not enough energy (ie, power) to accelerate the mass to the speed. You can use that 5 watts to spin something light really fast, or you can use that 5 watts to lift something heavy slowly, but 5 watts is all you have. In physics, there are no free lunches.

[@UNVIRUSLETALE]

I think the parts could easily be lasercut for better strengt of the materials

[@Cinema_Mechanics]

Just need a laser cutter.

[@ThePSYBORG]

Amazing

[@Vez3D]

Love it❤

[@ezraanderson842]

love it

[@jakeengland1430]

Have a look into howimat reducers

[@Cinema_Mechanics]

Oh I absolutely love that. Really interesting design. Almost a hybrid between harmonic drive and cycloidal.

[@chadjensenster]

Dude made a bunch of metal dowel pins when you can buy them over the counter.😂 Also, I second making any defirmed parts out of metal as other commentors have said. You have a cnc mill, you've proven the design with 3d printed parts, now you can justify the time and expense to make them out of metal. Not sure I would make them out of aluminum though. They are small enough, the extra weight steel would add would be insignificant

[@Cinema_Mechanics]

Well I mean I cut them. From a precision rod. Wasn’t actually that big a deal. Not sure where you buy individual pins at exactly the right length you need but sounds like a handy place!

[@theavaliengineer]

​@@Cinema_MechanicsYou can't usually buy at exactly the right length, but you can certainly design for COTS parts from the get-go :P

[@TheOneAndOnlySatan]

The modern way to summon me

[@chrismayer8990]

I fear that the ball bearings have too much play. At least if you want to achieve a high level of precision.

[@rubenverster250]

A good speaking hint for you Take it or leave it Try to use a lower pitch at the end of a sentence Increasing the pitch of your voice at the end of every sentence is a no-no

[@ItsBoyRed]

Hey man, just a heads up, but you may want to consult a doctor about your fingers, it looks like you have mild clubbing which could be a sign of lung or cardiovascular issues.

[@theenchiladakid1866]

I have one

[@theMGKPL]

uh maybe it's good deep dive but it's nothing new, we used that concept from paper for years with 3d printed gearboxes all over the world :/

[@AlexAnder-fo7ed]

Professional advice: don’t use plastic gears

[@deltacx1059]

This guy does not sound like he wants to be here.

[@AHustleIsLikeASideOfFries]

Yep, I could only listen to half the video. And just when you thought sever vocal fry was the hardest thing to listen to… 🤢

[@squa_81]

My favourite bored mechanical engineering narrator comes back with another extremely interesting topic! Who knows where I'll use it? Is it going to be a 20°K mechanical testing machine? Will it end up doing anything for hydrogen tanks? I certainly don't know anything else other than that cycloidal design is a very potent and interesting design :D

[@AHustleIsLikeASideOfFries]

Ugh, I cannot listen to his voice for very long without wanting to claw my eardrums out. It’s a very bored and disinterested cadence that follows the exact same pattern over and over and over. I could only listen to half of the video unfortunately

[@MarcinKrukar]

With such a ratio I do not predict any success, but if you are Polish, 40:1 is doable ;) kzbin.info/www/bejne/m6HIgqqnYsaMjJI I'm looking forward to the next parts, great job!

[@ft.moder001]

❤

[@claytonsingh]

This reminds me of a split-ring epicyclic planetary gearset kzbin.info/www/bejne/apjOk5VoeKeth6s

[@bregbarega3717]

I think requirements for an industrial robot isn't changed from what our ancestors set ages ago :D Rigidity first. Imagine that all our motors are stopped, firmly, they could be removed and the inputs could be welded. Now imagine that you grab the end of your 1,5 meter long robot arm and yank it. Does it moved more than 1-2mm? An industial robot would be like a stone in this case, rigid as f___, so when I'm planning a robot arm I start with the thinking of where is it gonna move when all inputs are locked. For example 1 meret long robot arm, with 3kg payload plus the mass of the arm itself, we can count for at least 10kg of moving mass, which is about 100Nm when it's extended horizontally (and stationay!) When it moves, and we want to stop it fast horizontally, it can easily doubles that, plus safe margin. So that's the mindset of which all DIY robot creators should think when it comes to sizing their parts. ;)

[@Cinema_Mechanics]

But you gotta also move it somehow! Great points though.

[@jones7399]

I feel like this guy doesnt have his intonation finetuned lmao

[@3dkiwi920]

The cadence makes this impossible to listen to.

[@Cinema_Mechanics]

At least it’s not AI! 😢

[@Xx32123]

your printer SUCKS!!! GET A BETTER ONE

[@RogierYou]

Is his t-shirt a pro Trump maga?

[@Cinema_Mechanics]

@@RogierYou it’s pro fender guitar.

[@AHustleIsLikeASideOfFries]

Great content, but have you ever been told your style of talking is difficult to listen to? You know how severe vocal fry is like fingernails on a chalkboard? This is nearly as bad, you speak in the exact same pattern over and over and over. It also gives the impression that you’re disinterested in the topic. Thought you’d want to know…

[@Cinema_Mechanics]

I have now. Thanks for the valiant effort in getting through it. ;-).

[@mariohernandez1111]

Why is your intonation like this? It's pretty distracting