If the tolerances are fine enough and the surfaces of the right shape and surface fineness a cycloidal drive can be back driven. The (usually) high reduction of cycloidal gearsets makes for a high loss of torque and thus difficulty in back driving them. The fact that all *teeth* are in rolling contact with their counterparts means that a MUCH larger torque can be transmitted and the risk of shearing off a tooth on a pinion or bull gear disappears.
Everybody talking about an imbalance, I made a 3d printed one for a robotic arm for my mechanical engineering senior project. I printed 2 rotors 180 degress out of phase. There was no vibration. Also, you can back drive them as when the robot lost power, the end of the arm would drop.
Using this with steel encased with oil at higher RPM: Handheld? Vibration monster with some heavy waddle with the rpm ramp-up. Fixed machine - Very nice aside from that it's a Friction monster regarding sliding-friction (where it sort of slides at the apexes pointing inward from the orange gear), if it's smooth it will work nice, but the sliding-friction will create a lot of heat. Dirt & Grime: since the apexes of the blue gear seems to "press" into the wells of the orange gear, dirt and grime could cause incremental damage which would seize the system very shortly after first detection of any irregularity. Using pristine and pure material and-of utmost exquisite part-precision and lubrication you can have a very small high torque gearbox that WILL in fact last a very long time. Yet still, after the first detection of any irregularity, you will have a failing system in no time. It's very delicate, but still if you want very nice things you need to be prepared to lose them easily. This also seems ridiculously easy to replace, lots of replacements won't be a hassle in most machines and devices, the cost for this even with the best of everything you can get will still cost significantly less if you desire keeping spares and have the will to replace them when needed so.
Good video. You should combine this print with the World's biggest gear ratio... video and tweak it and see if you can spin it and how many gears it will work with
I have a doubt, on my project i was using planetary gears to make a reduction of 64:1, but the high RPM and friction kept destroying the teeth. Would a cycloidal gearbox be a good option? Nice video btw
I think this is very cool, however, there a very many drawbacks to cycloidal gearboxes with the biggest being manufacturing as well as vibrations. Do to all the rubbing that occurs they easily generate rough vibrations which is unacceptable in profession machinery. When it comes to manufacturing the process to mass produce gearboxes. A standard gear is very easy to manufacture, however a cycloidal gear requires a milling machine. This is okay for special cases but their is a reason why you rarely see cycloidal gear drives mass produced. (Also cycloidal gearboxes can be back driven)
I think you mean precision machinery, not professional machinery. Standard spur gears often require milling to create them as well, especially if they need to be precise.
The vibration is the most apparent issue, and it is easily mitigated by a second gear set that is mirrored 180° so it cancelled the vibration the first gear made
Back driven means you can get the gears to move from either side. Some gears like the worm drive cannot be the output, but only the input when combined with a 'normal' gear. @@supermodern
How do 3D printed Cycloidal gearboxes hold up to wear versus planetary? I want to start getting into designs involving motors and rotation, but I want to stick to one dominant gearbox strategy to start, I I prioritize ease of printing and reliability.
What ever you go for using some form of lubrication is always a good idea. I started with jus a compound spur gear, gear train and it worked well enough, especially with nylon and lithium grease. Then I tried a planetary gearbox and it worked well too, albeit being more difficult to assemble (part of that was just my design). I haven’t tried cycloidal yet, but I plan on doing it. You should just experiment and try a few, just small scale ones with small motors and see which ones work best for you, with all the gear generators you can get now it really isn’t that difficult to design them. You should also experiment with different gear profiles like helical or herringbone. Also when printing gears do it on rafts, any elephants foot could cause the gears to mesh incorrectly and may lead to excess friction or the gearbox just not working. I prefer printing gears with a 0.25 mm nozzle but 0.4 mm does work too, you just won’t be able to make gears quite as small.
There will be some. If the tolerance isn’t too tight then it won’t be an issue. Often people put a bearing in there and between the yellow piece and blue piece to help reduce friction. When you make any gearbox to actually use you should lubricate it and with 3D printing the gearbox will probably need to be “broken in”, just run it until it gets smoother.
Wondering whether the German engineer Herr Doktor Felix Wankel drew upon that principle to design his now legendary rotary internal combustion engine cannot be helped.
Nippon's Mazda Motors had employed the said engine in its RX series of motor cars for decades, and as of this response's time stamp date, it most likely still did.
A cycloidal gear drive CAN be back driven. Yours was just not smooth enough to allow for the motion.
If the tolerances are fine enough and the surfaces of the right shape and surface fineness a cycloidal drive can be back driven. The (usually) high reduction of cycloidal gearsets makes for a high loss of torque and thus difficulty in back driving them. The fact that all *teeth* are in rolling contact with their counterparts means that a MUCH larger torque can be transmitted and the risk of shearing off a tooth on a pinion or bull gear disappears.
He also was not going to get enough torque by hand with that small shaft
Great content
He did it in the final shot.
Awesome video! Excited to see it connected to a drill 🙌
Have you shared these files anywhere? I would love to print one myself!
Everybody talking about an imbalance, I made a 3d printed one for a robotic arm for my mechanical engineering senior project. I printed 2 rotors 180 degress out of phase. There was no vibration. Also, you can back drive them as when the robot lost power, the end of the arm would drop.
Thanks for making these videos - I'm learning so much about gear types!
The oil pump in a engine uses this principal to pump at a fairly high pressure and volume. Its referred to as a trochoid oil pump.
Using this with steel encased with oil at higher RPM: Handheld? Vibration monster with some heavy waddle with the rpm ramp-up. Fixed machine - Very nice aside from that it's a Friction monster regarding sliding-friction (where it sort of slides at the apexes pointing inward from the orange gear), if it's smooth it will work nice, but the sliding-friction will create a lot of heat.
Dirt & Grime: since the apexes of the blue gear seems to "press" into the wells of the orange gear, dirt and grime could cause incremental damage which would seize the system very shortly after first detection of any irregularity.
Using pristine and pure material and-of utmost exquisite part-precision and lubrication you can have a very small high torque gearbox that WILL in fact last a very long time. Yet still, after the first detection of any irregularity, you will have a failing system in no time. It's very delicate, but still if you want very nice things you need to be prepared to lose them easily.
This also seems ridiculously easy to replace, lots of replacements won't be a hassle in most machines and devices, the cost for this even with the best of everything you can get will still cost significantly less if you desire keeping spares and have the will to replace them when needed so.
Good video. You should combine this print with the World's biggest gear ratio... video and tweak it and see if you can spin it and how many gears it will work with
I have a doubt, on my project i was using planetary gears to make a reduction of 64:1, but the high RPM and friction kept destroying the teeth. Would a cycloidal gearbox be a good option?
Nice video btw
potentially. the load is distributed
Lubricant it 🤣
I think this is very cool, however, there a very many drawbacks to cycloidal gearboxes with the biggest being manufacturing as well as vibrations. Do to all the rubbing that occurs they easily generate rough vibrations which is unacceptable in profession machinery. When it comes to manufacturing the process to mass produce gearboxes. A standard gear is very easy to manufacture, however a cycloidal gear requires a milling machine. This is okay for special cases but their is a reason why you rarely see cycloidal gear drives mass produced. (Also cycloidal gearboxes can be back driven)
I think you mean precision machinery, not professional machinery.
Standard spur gears often require milling to create them as well, especially if they need to be precise.
Vibration can be reduced with a second set out of phase.
A milling machine is more specialized than a gear hobbing machine? 😂😂
The vibration is the most apparent issue, and it is easily mitigated by a second gear set that is mirrored 180° so it cancelled the vibration the first gear made
A oil control gear for a mustang looks very similar minus the strap on top etc… Coyooooooooooote baby!!
Hello, did you share the cad files of the cycloid reducer in the video anywhere?
Excellent 😊
I wonder if a cycloidal engine would be possible? think like a rotary but using the action of the cycloidal interface as the engine rotor.
Very simular to how an oil pump works in a vehicle.
Its also close In function to a rotary engine
Not at all. This is rotational speed reduction. Not fluid pumping. (though the internals do have some visual similarities).
Is there a way to have your files to 3d print the drive? or can I buy one from you?. Thank you
Antonio Domit
Cycloidal drives CAN be back-driven, as long as you don't weld the output shaft in place.
Back driven means?
Back driven means you can get the gears to move from either side. Some gears like the worm drive cannot be the output, but only the input when combined with a 'normal' gear. @@supermodern
How do 3D printed Cycloidal gearboxes hold up to wear versus planetary? I want to start getting into designs involving motors and rotation, but I want to stick to one dominant gearbox strategy to start, I I prioritize ease of printing and reliability.
What ever you go for using some form of lubrication is always a good idea.
I started with jus a compound spur gear, gear train and it worked well enough, especially with nylon and lithium grease. Then I tried a planetary gearbox and it worked well too, albeit being more difficult to assemble (part of that was just my design). I haven’t tried cycloidal yet, but I plan on doing it. You should just experiment and try a few, just small scale ones with small motors and see which ones work best for you, with all the gear generators you can get now it really isn’t that difficult to design them. You should also experiment with different gear profiles like helical or herringbone.
Also when printing gears do it on rafts, any elephants foot could cause the gears to mesh incorrectly and may lead to excess friction or the gearbox just not working. I prefer printing gears with a 0.25 mm nozzle but 0.4 mm does work too, you just won’t be able to make gears quite as small.
@@conorstewart2214 Excellent advice, thanks for typing that out for me
friction between blue gear & white shaft??
There will be some. If the tolerance isn’t too tight then it won’t be an issue. Often people put a bearing in there and between the yellow piece and blue piece to help reduce friction. When you make any gearbox to actually use you should lubricate it and with 3D printing the gearbox will probably need to be “broken in”, just run it until it gets smoother.
Do you sell these?
fantastic
I think why people rather use planetary gears is because they don't create an unbalance.
It would be cool to see a backdriveable/reversible cycloidal gearbox. And am I crazy or does this look like it could be turned into an electric motor?
your crazy. This is a gear box, not an alternator or generator.
Could be attached to a motor in a fairly compact package, especially for the reduction. However, this is not, and never will be, a motor.
A well made cycloidal gear IS back drivable.
ruclips.net/video/pn7XzPfCTxA/видео.html
wdym turned into a motor lol
SO much friction in this design
Any fusion downloadable files so kids can play with it?
Wiggling and cracking like crazy and next moment you hear "no backlash"
Thanks
"basically no backlash..."
3 seconds earlier...
*Rattles the thing like a musical instrument*
Wondering whether the German engineer Herr Doktor Felix Wankel drew upon that principle to design his now legendary rotary internal combustion engine cannot be helped.
Nippon's Mazda Motors had employed the said engine in its RX series of motor cars for decades, and as of this response's time stamp date, it most likely still did.
Strain wave next
tanks, i send my LIKE!!!, maybe can share the stl?, thanks
>it can't be back driven
Nah, it's just the 1:8 ratio, pal. Add a handle, lube the thing up and try just a bit harder.
Looks like the inside to a ls engine oil pump
Seems like a ton of friction though 🤔
Isn't that where the torque comes from?
you did not just solder 3d printed parts together 💀
Gears
Yes
Yes
G R E A S E
Если он сделал ручку чтобы вращать, зачем вращал рукой? Бесит.
To those who can’t afford Fusion 360
(and it is pretty pricey):
look at Fr
eeCAD.
I love your contents, can I get a comment heart?
No
I gave you a dislike instead
The fact that thing is over complicated and frail, when one could achieve the same result with a much more simple geneva mechanism....
Bean
Bean
Bean
Hello, did you share the cad files of the cycloid reducer in the video anywhere?