Clean design. Clear and instructive explanation. Evaluated the results of the work. Original Content. Material list included. 3D Model included. Perfect video honestly.
to reduce vibration, the eccentric shaft is basically an off center shaft and the cycloidal disc is moving more side to side than rotation movement, so they put 2 disc in opposite side to cancel out the side to side meaning lower vibrations @@snorttroll4379
James Bruton used Cycloidal Drives in his most recent version of the robot dog. And I somehow doubt that it did not inspire you a little. It's worth checking out
That’s a very pleasant comment supported by solid arguments! I can feel it comes from someone who has watch many of the thousands of YT videos themed “let’s make a cycloïdal reducer”.🤦🏻♀️
Check out my favorite 3D printers, the K1 Max: amzn.to/3txQUC6 or if you are on a budget, the Ender-3 V3 SE: amzn.to/3FkCPus I hope you enjoyed this video and learned something new! If you'd like to support me making more content like this, please consider supporting me on Patreon: www.patreon.com/howtomechatronics
1. You can draw parametric curve from 0 to 180 degrees, then connect it's start and end, extrude half of the cycloid, and then just mirror it and get full shape. 2. It's better to use SolidWorks variables. This way you can change cycloid's shape much easier. 3. Efficiency was measured incorrectly. Does this motor really produce rated torque? Input torque should have been measured before measuring output torque. And it's also interesting how much torque will this reducer handle before something breaks. :)
My cycloidal gears want to slip off of their central as the tolerance wasn't made too tight. What do you think I should do to remedy this situation? Should I reprint the gears with a tighter tollerance to force it on the bearing and reconstruct the eccentric shaft or should I just super glue the bearing to the gear on the inside? I wonder if they eventually just do this from wear over time too
wow your video is very nice. i was experimenting with @James Bruton cyclodial drive model. would love to try with yours when i have enough filament. what is next harmonic drive?
Thank you! Go for it :) There's already a video for Harmonic drive from last year. If you've missed it, here it is: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xlnNj9F37MA.html Cheers
Very interesting video on how to make our own cycloid motor at home, thanks for sharing with us ! On a 3D printer, the horizontal hole extension option is always problematic. I have tested it on many parts on my calibrated X1 sidewinder printer under ideamaker and this is not very accurate and repeatable, the outer parts are ok but the hole diameters are often oblong and always vary from clone to clone. First price 3D printer are good for POC but not suitable for a precision DIY part that must last. I hope that one day "How to mechatronics" will build a mini EDM machine with wire/electrode and/or a sls printer to allow home user to make complex and precise shapes in metal. I am pretty sur that most of us will be happy to sponsort him in order to product this kind of tools in opensource.
Excellent work and video ! Congrats One question if I may : what are the advantages & drawbacks of a cycloidal drive vs a strain wave gear (harmonic drive) ?
@NabtescoMotionControl It is less than 1 % in comparison to regular gear systems. Regular gear boxes are everywhere....cycloidal gearboxes are very limited in industry mostly used for robotics. "Widely used" is subjective. From cars over wind turbines to conveyor belts - all still use planetary or regular reduction gears. Even Tesla's Drive unit is a regular reduction gear. ;)
@NabtescoMotionControl I think you are over reading my comment. I'm not saying they are not used. But in comparison to the amount of regular gear boxes they are literally a fraction in all industy. There has to be some reasons for that. Probably much more expensive to produce, more friction/heat, difficult to maintain etc.
these things love and i mean LOVE being submerged in lubricant oil !!! in huge tractors they are always full of lubricate oil and they basically never fail .... tractors put them on final drives becoz of there robustness ... only seals and oil leaks but the mechanism hardly fails
In the first seconds of the video I thought the scene was a 3d rendering, so clean it is !!! until I saw your hand grabbing the device. Nice video and valuable content !
Stop the parametric curve at 99.99% an jankily finish it with a little arc => Solidworks in a nutshelll XD This thing drives me nuts : gets crazy good, easy to use functions and drawing abilities to 99,99% and you spend days fixing the 0.01% because it requires you to rethink your design around it. Amazing gearing tho, really like how simple and compact these ones looks. But can't help to wonder about their durability and efficiency... not mentionning how expensive they are.
I'm an electrical engineer brought here by a chance, however I do have certain appreciation of the mechanical engineering. I am able to judge that this video presents an extensive engineering effort, showing itself both overall and in the details. I wish I could work with you on my energy conversion related projects (quite a lot of mechanical engineering is required there), or that my mech. engineers could represent at least a half of your ability and attitude to the subject.
Hey all, just FYI, the equation as copied and pasted into SW had some issues. I copy and pasted it directly into SW2022 and it came up with something that looked more like a flower than a gear. After watching a video on Stepbystep-robotics channel I was able to figure it out. He had done some intermediate calcs on a couple of the terms and then replaced those terms in the equation and removed the associated parentheses that are no longer needed. This solved the problem. Also, in SW you can use the equation editor to lay out your terms and then put the equation into the sketch using the terms with, with " around each term. This makes your disk editable without having to re-copy/paste the equation in.
one question: if you have 12 bushings and the plates have 11 notches, why is the ration 11:1 and not 12:1 ? each notch of the plates has to engage 12 times to get one revolution. or am i misthinking the case?
The purpose of having two disks out of phase is to ensure that the pin disk is firmly braced inside the holes of the cycloidal disk, and provide a counterbalance to either single cycloidal disk, reducing vibration and backlash. If you look at how the cycloidal disks drive the pin disk, only one disk is theoretically necessary for smooth motion on the output shaft. A third disk, 120 degrees out of phase is just going to add size, weight, and complexity, and it’lll make your tolerance stackup a nightmare to deal with. And there’s no real upside to it.
@@SergeiPetrov Just a matter of tightening up your tolerances and making sure your cycloidal disks have the correct tooth profile. Adding more disks won’t fix either problem.
Hi You are amazing I love your chanel so much I need help from you please I want to make larg CNC for wood (200×150×30)(cm) can you give me an idea Where can I explain something like this?
I converted your step file to Fusion 360 format. Your clearance between the disk and bearings is only 0.05mm !!! Is your 3D printer that good? I have to allow 0.2mm - 0.3mm clearance for my printer, If I want a good fit without bringing the hammer into the picture.
Great video with intuitive and inspiring design. Would you like to specify which bearing to choose where the crank shaft contacts with the cycloidal disks? I do wonder rollers or balls might serve the role better)
About the shaft : when screwing pla parts together, I avoid using purely undersized holes : there will be a lot of friction wich will generate heat when screwing, risking to damage the part. a common option is to use threaded inserts, but they are expensive and not always usable (tiny space for a screw, for example) personally, for 3mm screws (just for reference, my engineering project uses non less than 41 m3 screws all holes made with the following method) : a 2.3-2.4mm hole in the 3d model, that hole is re-drilled with a 2.5mm bit (inner diameter of M3, M5 is 4.2, for reference) with a cordless drill at slow speed to avoid melting the PLA, the hole gets a perpendicular exit (through part hole / I had in the model an other hole perpendicular at the end of the screw's hole) to make an exit for the debris, lastly the hole is slowly hand-threaded with a M3 tap and tap holder with a 2 turns down, half turn up, movement, to limit friction and let debris go down to the exit. If the hole is deeper than 15mm, I firstly do a 10mm pass, remove the tap and clear debris with a straightened paperclip, to much debris will make a lot of friction, heating up the pla and ruining the thread, so go slowly. Uses and personal recommendations : Fixing a pcb : a m3, 6mm long thread is enough. Fixing plastic parts together : a 10-15mm long thread is enough
Amazing device. Makes me wonder how a similar design is used in nature when we look at the microscopic level of cellular mechanisms , like protein complexes held in some membranes.
This design is nothing new, has been used on industrial shredders for many years, the downside of this design is it is very expensive making it impractical for consumer goods.
If you want the outer housing (outer part to turn) and the pins that are used as the output to be kept in place, can you still use pins for the outside or do you have to have another cycloid?
Thank you for your helpful video. I was wondering if you could help me out with 2 questions. How did you calculate the thickness of the disc and also how did you decide on the number of output holes on the disc ? Your video was a great inspiration, I hope to build my own version very soon. Thanks again!
Say if I want to mount a position sensor on the output. How could we achieve that if everything is moving inside? And to clarify, I mean without interfering with the output shaft. And as always, great video!
@@tomusklepipieta1009 well, yeah. But how would you mount that? Everything inside of it is moving and the gear speed is different than the output shaft speed. This is most problematic for absolute encoder.
Bolt the encoder casing to the cycloidal drive casing. It’s the same as any other reduction scheme. Something has to be stationary in the greater assembly for it all to work. Just because the guts are moving doesn’t mean the casing should.
Thanks for your amazing work. I have recreated one of your projects with the LPC1768 microcontroller for my Embedded course at the university. you can see it on my channel. keep it up👍
I've made two of Mechatronics projects, the Mars Rover and the Scara Robot Arm. These projects are great because they are well thought out and designed, with lots of photos and construction details. Looking forward now to make one of these drives to learn about it and maybe use it in a different Scara robot arm. Good stuff Dejan! Thanks for this.
Loved your videos and subscribed to your channel. I have a question if you can help. I am trying to build a platform using stepper motor which is rectangle in shape. It's 20 inch long and 8 inch wide. want to be able to put weights on this platform and being able to rotate (horizontal). Any idea how would I do this with timing belt or other mechanism.
Thanks for sharing. Thanks to the sponsor comlany made it easy for us to see your current project. I need to see again and put my questions later here. Can you name so e apication please. Thanks. PJ, Germany
Greatly explained! And shown details are also very comprehensive. Is the output speed very uniform or did you recognize any unsteadyness. So you recommend these published formulas?
I though this was made from legos when i first seen it. So now i wonder if its possible to create a lego kit which would build a "functional" one of these. Be a great way for kids to learn how these engines are put together and how they work.
Is it possible to put a third disk in to balance it even further like an inline 4 engine? I think there's still a longitudinal moment generated by the two disks not being on the same plane.
