Re: [Emc-users] Harmonic drive, rubber flex ring
Normal spur gears will do this too if the tooth shape is wrong. To get the tooth shape correct you either have to understand some math or copy a correctly designed gear. It could be that the designer got the shape of the cycloid gear wrong. If so you can't use his STL files even if your printer is perfect. But you can borrow his idea for your own design. On Mon, Mar 1, 2021 at 8:56 AM Jon Elson wrote: > On 03/01/2021 04:11 AM, andrew beck wrote: > > This may interest people wanting to make 4th axis stuff > > > > https://youtu.be/-065J34xC5o > > > The output disc seems to be rotating in a jerky manner. > This could be a video compression artifact, or related to > precision of the parts. > > Jon > > > ___ > 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
Re: [Emc-users] Harmonic drive, rubber flex ring
Small update... https://youtu.be/LoxpqbGFl2g On Mon, Mar 1, 2021, 10:56 AM Jon Elson wrote: > On 03/01/2021 04:11 AM, andrew beck wrote: > > This may interest people wanting to make 4th axis stuff > > > > https://youtu.be/-065J34xC5o > > > The output disc seems to be rotating in a jerky manner. > This could be a video compression artifact, or related to > precision of the parts. > > Jon > > > ___ > 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
Re: [Emc-users] Harmonic drive, rubber flex ring
On 03/01/2021 04:11 AM, andrew beck wrote: This may interest people wanting to make 4th axis stuff https://youtu.be/-065J34xC5o The output disc seems to be rotating in a jerky manner. This could be a video compression artifact, or related to precision of the parts. Jon ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Harmonic drive, rubber flex ring
This may interest people wanting to make 4th axis stuff https://youtu.be/-065J34xC5o On Wed, 24 Feb 2021, 01:47 Sam Sokolik, wrote: > I think it is mainly that the 3d printed parts are not perfect.. I squared > the printer - but it still isn't 100%. I think they will be good enough > for this experiment though. > > On Tue, Feb 23, 2021, 1:44 AM John Dammeyer > wrote: > > > > From: Sam Sokolik [mailto:samco...@gmail.com] > > > https://youtu.be/VK4zgFTD2SA > > > > > Nice so far! > > You mentioned the belt rides up and it looked like it did in one > direction > > and then down in the other. > > Do you think that's because the center pivot isn't well supported until > > you install the pilot bearing? > > If the belt does ride up what do you think the issues are with it maybe > > rubbing on the top or the bottom edges? > > John > > > > > > > > ___ > > 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
Re: [Emc-users] Harmonic drive, rubber flex ring
I think it is mainly that the 3d printed parts are not perfect.. I squared the printer - but it still isn't 100%. I think they will be good enough for this experiment though. On Tue, Feb 23, 2021, 1:44 AM John Dammeyer wrote: > > From: Sam Sokolik [mailto:samco...@gmail.com] > > https://youtu.be/VK4zgFTD2SA > > > Nice so far! > You mentioned the belt rides up and it looked like it did in one direction > and then down in the other. > Do you think that's because the center pivot isn't well supported until > you install the pilot bearing? > If the belt does ride up what do you think the issues are with it maybe > rubbing on the top or the bottom edges? > John > > > > ___ > 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
Re: [Emc-users] Harmonic drive, rubber flex ring
> From: Sam Sokolik [mailto:samco...@gmail.com] > https://youtu.be/VK4zgFTD2SA > Nice so far! You mentioned the belt rides up and it looked like it did in one direction and then down in the other. Do you think that's because the center pivot isn't well supported until you install the pilot bearing? If the belt does ride up what do you think the issues are with it maybe rubbing on the top or the bottom edges? John ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Harmonic drive, rubber flex ring
https://youtu.be/VK4zgFTD2SA On Mon, Feb 22, 2021 at 6:58 PM andrew beck 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, 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%2F9DwqN1pEkVgdata=04%7C01%7Cralph > > . > > > stirling%40wallawalla.edu > > > %7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c
Re: [Emc-users] Harmonic drive, rubber flex ring
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, 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%2F9DwqN1pEkVgdata=04%7C01%7Cralph > . > > stirling%40wallawalla.edu > %7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C6374 > > > 96146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D% > > > 7C1000sdata=YBD%2FKZovPfTef91aE6pGGouAoBcUP%2BKB2ZVe4cJCsVY%3Dreserved=0 > > > -- > > > > > > Chris Albertson > > > Redondo Beach, California > > > > > > ___ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > > > > > https://nam12.safelinks.protection.outlook.co
Re: [Emc-users] Harmonic drive, rubber flex ring
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%2F9DwqN1pEkVgdata=04%7C01%7Cralph. > stirling%40wallawalla.edu%7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C6374 > 96146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D% > 7C1000sdata=YBD%2FKZovPfTef91aE6pGGouAoBcUP%2BKB2ZVe4cJCsVY%3Dreserved=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- > usersdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c > 8debfb75e7aa64%7C0%7C0%7C637496146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiL > CJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000sdata=OhcfGIXX%2F338hnNQvan%2Fmo3LNWTyjTOboqRaAw591JA%3Dr > 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
Re: [Emc-users] Harmonic drive, rubber flex ring
Getting there http://electronicsam.com/images/greenmachine/IMG_20210222_134102.jpg http://electronicsam.com/images/greenmachine/IMG_20210222_134132.jpg http://electronicsam.com/images/greenmachine/IMG_20210222_134145.jpg On Mon, Feb 22, 2021 at 1:17 PM Chris Albertson wrote: > 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%2F9DwqN1pEkVgdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637496146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000sdata=YBD%2FKZovPfTef91aE6pGGouAoBcUP%2BKB2ZVe4cJCsVY%3Dreserved=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-usersdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637496146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000sdata=OhcfGIXX%2F338hnNQvan%2Fmo3LNWTyjTOboqRaAw591JA%3Dreserved=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
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%2F9DwqN1pEkVgdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637496146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000sdata=YBD%2FKZovPfTef91aE6pGGouAoBcUP%2BKB2ZVe4cJCsVY%3Dreserved=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-usersdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637496146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000sdata=OhcfGIXX%2F338hnNQvan%2Fmo3LNWTyjTOboqRaAw591JA%3Dreserved=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
Re: [Emc-users] Harmonic drive, rubber flex ring
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%2F9DwqN1pEkVgdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637496146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000sdata=YBD%2FKZovPfTef91aE6pGGouAoBcUP%2BKB2ZVe4cJCsVY%3Dreserved=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-usersdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9d6a2020ac674f4b088e08d8d75e2eba%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637496146796527482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000sdata=OhcfGIXX%2F338hnNQvan%2Fmo3LNWTyjTOboqRaAw591JA%3Dreserved=0 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
