https://youtu.be/VK4zgFTD2SA
On Mon, Feb 22, 2021 at 6:58 PM andrew beck <andrewbeck0...@gmail.com> wrote: > Hopefully I'll get into a big cycloidal drive for my Cnc mill soon all out > of steel. > I was thinking of making it 300mm dia maybe. > I think most 5axis Cnc Mills use cycloidal drives if they don't just have > big direct drive servos. > > > On Tue, 23 Feb 2021, 09:28 John Dammeyer, <jo...@autoartisans.com> wrote: > > > I agree. Rather a nothing video. Took about 30 seconds to view it > > skipping past the "these are screws in my hand" parts. And clicking on > the > > x in the advertising that kept popping up. > > > > I too would like to build a robot arm to replace the Radio Shack Armatron > > I bought while on holidays in the late 80's. > > https://en.wikipedia.org/wiki/Armatron > > My wife sat outside the trailer sun tanning. I played with it inside > > where it was cool. My kids played with it when they were younger. Now > > it's back in the box ready for grandchildren. > > > > But a larger scale one with harmonic drive joints would be fun. > > John > > > > > -----Original Message----- > > > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > > Sent: February-22-21 11:15 AM > > > To: Enhanced Machine Controller (EMC) > > > Subject: Re: [Emc-users] Harmonic drive, rubber flex ring > > > > > > 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%7C6374 > > > > > > 96146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D% > > > > > > 7C1000&sdata=YBD%2FKZovPfTef91aE6pGGouAoBcUP%2BKB2ZVe4cJCsVY%3D&reserved=0 > > > > -- > > > > > > > > Chris Albertson > > > > Redondo Beach, California > > > > > > > > _______________________________________________ > > > > Emc-users mailing list > > > > Emc-users@lists.sourceforge.net > > > > > > > > > > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc- > > > users&data=04%7C01%7Cralph.stirling%40wallawalla.edu > > %7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c > > > > > > 8debfb75e7aa64%7C0%7C0%7C637496146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiL > > > > > > CJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=OhcfGIXX%2F338hnNQvan%2Fmo3LNWTyjTOboqRaAw591JA%3D&r > > > eserved=0 > > > > > > > > > > > > _______________________________________________ > > > > Emc-users mailing list > > > > Emc-users@lists.sourceforge.net > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > > > > -- > > > > > > Chris Albertson > > > Redondo Beach, California > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
