@@lambsauce5445 maybe check the dates before commenting. This was a year ago and James put his out starting just over a week ago. Also only pointing out the motor choice shows that you likely know very little about the differences in their cycloidal drive designs.
The harmonic drive would perhaps be perfect for an equatorial mount used for telescopes. They need a zero backlash system with perhaps an arc second as smallest movement in combination with microstepping of a steppermotor.
I took a couple weeks and designed one of these using an equation I found online once but never printed it. It’s intriguing because it’s a lot easier to manufacture that a harmonic drive but from what i have heard it’s hard to decrease the sound and vibration they produce
My version didn't produce any sound, as far as I can tell. And having two cycloidal gears offset 180 degrees should almost fully eliminate the inherent vibration. I believe that a perfectly designed cycloidal gear, which would maintain constant contact with every tooth, should allow for nt wobble, and, hypothetically, no noise. And I really appreciate your support, but if you'd like to see a REALLY good 3D printed cycloidal drive, check out Paul Gould.
If you use 2 disc at 180°, you can strongly reduce vibration. If you use 4 (or 3) discs at 0°, 180°, 180°, 0° you have virtually no vibration. The problem is, that the output of a cycloidal drive is not perfectly linear, which can hurt your positional accuracy if you don't compensate for it
@@alexanderhorstkotter2910 I just redid my design over the weekend with this 3 disc (middle disk being twice the thickness and mass) concept. I am happy with how compact the design still is and I was also able to find great prices on the perfect sizes of bearings. I honestly hadn't thought about the fact that the output velocity isn't linear though. This is obviously a problem when doing robotics with this drive (ex. I want to make a robotic arm with it). Do you know where I could find an equation for the output velocity profile so I can attempt to compensate for it?
@@LeviJanssen I looked into Paul Gould's design as well as some other people he took design inspiration from. I am about to the point that I can start printing my parts to test things out. I plan to cut the rotors out of delrin on my cnc after that and use precision ground .125 stock for the ring pins. What kind of tolerance do you give in the prints in order to help things fit together without binding? I only have enders 3's and an anet a8.
The one I 3D printed was just for testing sake, and I didn’t put much thought into tolerances. I had to use a file to get the teeth down to size. And I printed it on my custom printer, so that doesn’t help much. I think printing it multiple times with varying tolerances is probably necessary, and I recommend starting with tolerances that you know will fit, that might be a little oversized. Good luck! I can’t wait to see it
Great Job! is the goal to have a perfect design? Realistically, the machining tolerances would negate it, correct? Wouldn't you risk running into other bigger problems when machining tolerances might render it inoperable etc? Edit: I commented before watching the whole thing.
Nice compact design. I need a 100:1 reducer with low vibration, low backlash, high positional accuracy to use in a telescope. Do your cycloidal reducer or harmonic drive with belt generator have this properties?
Why did you give up on the harmonic drive ? Are there any high ratio compact gearboxes that are still back drivable ? Where are the high stress points that would fail if you applied an actual load on this gearbox ? What are the main disadvantages of this gearbox compared to other types in particular planetary gearbox which seems to be preferred for actuators such as the opentorque ?
Levi Janssen, okey cool! Ill have a look. Thank you for the response Levi! Btw i like the stuff you do keep it up and i am sure you are going to be big one day!
Not to the cycloidal gear, since it’s orientation is constantly changing. You could add a counterweight to the shaft, or in the case of an out runner motor, to the bell.
Dude, don't say there's .005mm of a gap between the parts ranting about backlash only to later reveal you are 3D printing these things. You'd be lucky to get .2mm part tolerance coming from a 3d printer! Additionally, reducing part tolerances and adjusting fits only take you so far insofar as creating a backlash free design. Good design has the ability to completely eliminate backlash purely within the scope of the design in combination with accurate manufacture.
Also this is the most successful printed cycloidal drive I think I’ve ever seen on TH-cam.
Nope. James Bruton's is faaar superior. But good 1st try Levi. Maybe try it with a BLDC (Brushless DC) motor next time with an O-Drive.
@@lambsauce5445 maybe check the dates before commenting. This was a year ago and James put his out starting just over a week ago. Also only pointing out the motor choice shows that you likely know very little about the differences in their cycloidal drive designs.
The Essence of CAD to Prototype Awesomeness! Subbed!
The harmonic drive would perhaps be perfect for an equatorial mount used for telescopes. They need a zero backlash system with perhaps an arc second as smallest movement in combination with microstepping of a steppermotor.
Good job. Wait to see the metal version!
I took a couple weeks and designed one of these using an equation I found online once but never printed it. It’s intriguing because it’s a lot easier to manufacture that a harmonic drive but from what i have heard it’s hard to decrease the sound and vibration they produce
My version didn't produce any sound, as far as I can tell. And having two cycloidal gears offset 180 degrees should almost fully eliminate the inherent vibration. I believe that a perfectly designed cycloidal gear, which would maintain constant contact with every tooth, should allow for nt wobble, and, hypothetically, no noise. And I really appreciate your support, but if you'd like to see a REALLY good 3D printed cycloidal drive, check out Paul Gould.
If you use 2 disc at 180°, you can strongly reduce vibration. If you use 4 (or 3) discs at 0°, 180°, 180°, 0° you have virtually no vibration. The problem is, that the output of a cycloidal drive is not perfectly linear, which can hurt your positional accuracy if you don't compensate for it
@@alexanderhorstkotter2910 I just redid my design over the weekend with this 3 disc (middle disk being twice the thickness and mass) concept. I am happy with how compact the design still is and I was also able to find great prices on the perfect sizes of bearings. I honestly hadn't thought about the fact that the output velocity isn't linear though. This is obviously a problem when doing robotics with this drive (ex. I want to make a robotic arm with it). Do you know where I could find an equation for the output velocity profile so I can attempt to compensate for it?
@@LeviJanssen I looked into Paul Gould's design as well as some other people he took design inspiration from. I am about to the point that I can start printing my parts to test things out. I plan to cut the rotors out of delrin on my cnc after that and use precision ground .125 stock for the ring pins. What kind of tolerance do you give in the prints in order to help things fit together without binding? I only have enders 3's and an anet a8.
The one I 3D printed was just for testing sake, and I didn’t put much thought into tolerances. I had to use a file to get the teeth down to size. And I printed it on my custom printer, so that doesn’t help much. I think printing it multiple times with varying tolerances is probably necessary, and I recommend starting with tolerances that you know will fit, that might be a little oversized. Good luck! I can’t wait to see it
Nice man. I went through the same cycloidal stage, just didn't have your sticktoit'dness
Great Job! is the goal to have a perfect design? Realistically, the machining tolerances would negate it, correct? Wouldn't you risk running into other bigger problems when machining tolerances might render it inoperable etc? Edit: I commented before watching the whole thing.
Crazy. Why didn't I think of this? I'll come see you often.
I love your videos man. I am learning a lot from you.
Cool would you be willing to share the cad files?
@Levi Janssen Ya I would love to mess around with a set to better understand your video.
I dont think he is going to..
Well done!
Nice compact design.
I need a 100:1 reducer with low vibration, low backlash, high positional accuracy to use in a telescope.
Do your cycloidal reducer or harmonic drive with belt generator have this properties?
Yes, for the most part. A cycloidal drive won’t, however, have low vibrations at high speed without a second cycloidal disk.
Why did you give up on the harmonic drive ?
Are there any high ratio compact gearboxes that are still back drivable ?
Where are the high stress points that would fail if you applied an actual load on this gearbox ?
What are the main disadvantages of this gearbox compared to other types in particular planetary gearbox which seems to be preferred for actuators such as the opentorque ?
Looks good. Keep us updated
Great work! Test it!
Hey, do you sell this through some place?
Do you have the plans available?
How does this compare to a planetary gearbox which is also very compact, cycloidal still offers a higher gear reduction i guess?
amazing. so compact. will you make an offset version to get rid of the wobble?
Good work!
Wow this is super 👏 awesome love it thanks
How much torque does it has?
How much backlash would such a gear have.
oh man the high frequancy i hear break my ear
10:32 bcoz those pins are wobling is that cover noncentric or is it just wobling spin too xD
Where can i download this gearbox?
Project files are made available via my Patreon.
Levi Janssen, okey cool! Ill have a look. Thank you for the response Levi! Btw i like the stuff you do keep it up and i am sure you are going to be big one day!
Would you put it on thingiverse or a place for ppl to print it
Is it possible to add an offset mass to the inner gear to recenter it's CG and kill the vibrations?
Not to the cycloidal gear, since it’s orientation is constantly changing. You could add a counterweight to the shaft, or in the case of an out runner motor, to the bell.
I don't understand why some of these have two of those middle parts rotating on top of each other tho :/
Edit: OH WAIT IS IT TO GET RID OF WOBBLE?
counter mass for vibration. also balances torque that can be output.
wow, it's so small ! Damn
Electric rotary engine?
So? Look up rail gun for alternatives.
Dude, don't say there's .005mm of a gap between the parts ranting about backlash only to later reveal you are 3D printing these things. You'd be lucky to get .2mm part tolerance coming from a 3d printer! Additionally, reducing part tolerances and adjusting fits only take you so far insofar as creating a backlash free design. Good design has the ability to completely eliminate backlash purely within the scope of the design in combination with accurate manufacture.
Nazi tanks used this? Is it true..