The Step file I sent is fully functional when imported to Fusion360. There are a few changes I would make too. If the problem is the cup flexing, Maybe try some accordion pleats, a few broad sine-like curves in the cup. Why are the wals cylindrical?
Another idea is to remove the bottom from the cup so it is just a tube and not a cup then cut a square wave patters on the bottom and drive ot with a disk with an interlocking pattern. Then there is no more bending on the booton radius. On Wed, Dec 1, 2021 at 3:38 PM John Dammeyer <jo...@autoartisans.com> wrote: > Chris sent me a zip with the project step file. This one I was able to > load and save. The individual part files were not editable. > > However, once I saved that imported step file as the entire assembly > AlibreCAD saved it as a series of assemblies and part files; 88 in all > including the original step file. The assembly does not have any > constraints so once you pull the pieces apart it's hard to put them back > without adding in constraints. > > Anyway, these are editable. > If anyone wants a zip with the .AD_ASM and .AD_PRT files I'll pass it on. > At this point you load Harmonic Drive Project v45.AD_ASM and can edit the > individual part files although they can't be saved from within the part > editing. Only inside the assembly. > > But separately they can be edited. Probably a bug in Alibre. They don't > call it Read Only or Read/Write but locked and unlocked. > > John > > > > -----Original Message----- > > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > Sent: December-01-21 2:59 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Harmonic Drive > > > > If it is too much work, ask me and I will re-export the entire model from > > Fusion360 to STEP, and I'm sure there will be no read-only as Fusion360 > > does not do that. > > > > I also want to re-organize it, like at least placing all the nuts and > > screws in a "hardware" component so that can all be turned off and on at > > once rather than doing 100+ clicks > > > > On Wed, Dec 1, 2021 at 2:53 PM John Dammeyer <jo...@autoartisans.com> > wrote: > > > > > How about. Now it works. I can load the assembly but the embedded > read > > > only characteristic is just plain rude. So the work around with > Alibre is > > > as follows: > > > > > > Import the .step file. > > > Select one of the elements like "Housing" and right click to open in > > > separate window. > > > Doesn't matter what you do to the drawing you can't change it but it > can > > > be exported as an .IGES file. > > > So now I have "Housing.igs" and can import that and then save as the > > > "Housing.AD_PRT" > > > > > > It's still a clumsy step file type of import that doesn't have the same > > > ease of use editing that parts built with Alibre have but at least it's > > > editable and some of the very poor features of the design can be > changed. > > > > > > John > > > > > > > > > > -----Original Message----- > > > > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > > > Sent: December-01-21 1:18 PM > > > > To: Enhanced Machine Controller (EMC) > > > > Subject: Re: [Emc-users] Harmonic Drive > > > > > > > > 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 > > > > > > > > > -- > > > > 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
