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
