The Youtuber is just making stuff to show on Youtube. If he had a specific
use-case, then he would have to choose the system. Cycloidic drive can be
back driven and have a lower reduction. If you need that, you need that.
Harmonics can't be back driven and can have 100:1 reduction. The two are
not really interchangeable.
My interest in this is robotics. THis is the entire reason for using
LinuxCNC andmachine tools is to make parts for robotic related experiments.
I've not given up on belt reduction. A three-stage reduction with 4:1
pulleys can fo a 4x4x4 = 64:1 reduction with very little friction. It
competes will with harmonic and cycloidic reduction. If designing
something you have to explore all these options as there is never a "best",
only a "best in this case".
On Mon, Feb 22, 2021 at 10:43 AM Ralph Stirling <
ralph.stirl...@wallawalla.edu> wrote:
> Interesting video, and also interesting that the guy has
> abandoned the harmonic drive in favor of cycloidal
> drive.
>
> -- Ralph
> ________________________________________
> From: Chris Albertson [albertson.ch...@gmail.com]
> Sent: Monday, February 22, 2021 10:17 AM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] Harmonic drive, rubber flex ring
>
> CAUTION: This email originated from outside the Walla Walla University
> email system.
>
>
> To add one more idea to the long-running conversation of how to build a
> harmonic reduction drive. Here is a working prototype that looks like the
> flex-cup solution is solved. This could work for many years. But the
> video shows only the idea and a prototype. I would not make this one but
> rather use the idea. What is needed is better bearing to support the load.
>
> What I would do is make a sturdy metal shaft that connects the output disk,
> rotor, input disk and motor, maybe using tapered roller bearings and then
> the motor turns the shaft perhaps through a flexible urethane coupler.
> Ideally there would be an optical encoder disk buried inside someplace too.
>
> The prototype in the video has nothing but gravity or the user's thumb to
> hold it together but it does solve the harder problem of the flex-cup that
> can last for many years.
>
>
> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2F9DwqN1pEkVg&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637496146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=YBD%2FKZovPfTef91aE6pGGouAoBcUP%2BKB2ZVe4cJCsVY%3D&reserved=0
> --
>
> Chris Albertson
> Redondo Beach, California
>
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>
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--
Chris Albertson
Redondo Beach, California
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