Sam, This guy in the video claims he developed the dual cup belt drive system. I don't believe him but I am curious where it came from. He's supplied CAD readable parts and stl. But he's also using involute form so I somehow think he didn't design it but is taking credit.
https://youtu.be/Emvo3bLT-Z4 And the parts. The .ipt ones I can load with AlibreCAD. https://github.com/DDeGonge/OS-ARM/tree/main/cad/HarmonicDrive75mm John > -----Original Message----- > From: Sam Sokolik [mailto:samco...@gmail.com] > Sent: December-01-21 1:36 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Harmonic Drive > > The problem (I think) is that you want to deform the plastic as little as > possible. That is why I went with smaller teeth... (and no cup) > > sam > > On Wed, Dec 1, 2021 at 3:22 PM Chris Albertson <albertson.ch...@gmail.com> > wrote: > > > Thanks for the link. But I noticed there was a STEP file provided. I've > > imported it into Fusion360. It imports well. No need to convert the STL > > files. > > > > Here is a view-only public link to the Fusion360 model. > > https://a360.co/3phrfI6 > > I've made no edits to the above. simply did the import. > > > > The model could use some reorganization. It is just a linear list of parts > > with no hierarchy but unlike STL files the exact shape of the parts is > > preserved. > > > > Thanks again. > > > > Chris > > > > > > > > > > > > > > > > > > > > > > On Wed, Dec 1, 2021 at 9:33 AM John Dammeyer <jo...@autoartisans.com> > > wrote: > > > > > Chris, > > > > > > This was my starting point. The step files aren't available in that > > > link. The STLs have been converted although some badly. Still working > > on > > > getting better step files from STL. > > > > > > > > > > > https://howtomechatronics.com/how-it-works/what-is-strain-wave-gear-harmonic-drive-a-perfect-gear-set-for-robotics- > applications/ > > > > > > I don't have the larger 47x35 bearings yet so I subbed in a 47x20. > > > Without two bearings there will always be a bit of wiggle there. I found > > > only two of the 5x16x5 in my random bearing box. I have 10 of those on > > > order too. For now I recreated the wave generator to just use two > > > bearings. > > > > > > I have a tube of 11mm bearings that when doubled up (or maybe not) can be > > > put closer together creating less of a point source bend that the single > > > bearing does. That might fatigue the plastic less. > > > > > > Also turning the hub that goes through the bearing out of metal and > > making > > > the companion mounting plate for the cup out of metal would allow a > > coupler > > > shaft through from the wave generator disk to the centerline of the drive > > > bearing. This would likely also clean up any wobble from thin printed > > > plastic. > > > > > > John > > > > > > > > > > > > > -----Original Message----- > > > > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > > > Sent: December-01-21 9:13 AM > > > > To: Enhanced Machine Controller (EMC) > > > > Subject: Re: [Emc-users] Harmonic Drive > > > > > > > > John, > > > > > > > > Looks like I'm finding this thread late. Where are the design files > > for > > > > this harmonic drive? > > > > > > > > On Tue, Nov 30, 2021 at 11:22 PM John Dammeyer <jo...@autoartisans.com > > > > > > > wrote: > > > > > > > > > I've added a photo. > > > > > www.autoartisans.com/harmonicdrive/HarmonicDrive-8.jpg > > > > > > > > > > The new wave generator pieces puts the bearings 1mm further out. Was > > > also > > > > > able to bring it a bit closer to the motor so the bearings now sit in > > > the > > > > > middle of the fixed spline gear. > > > > > > > > > -- > > > > > > > > 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 > > > > > > > > > -- > > > > 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
