On Thu, 2 Dec, 2021 at 3:43 AM, John Dammeyer <jo...@autoartisans.com> wrote:
To: 'enhanced machine controller (emc)' Nice to see that on Thingiverse. A couple of things that come to mind. That is one huge bearing. For the output shaft how much end play does it allow? An output shaft like that with a couple of cheap tapered trailer bearings instead of an unobtanium bearing. Provide stl/stp models of the parts the gears (and bearings) fit into. Now granted someone in real life wouldn't make those parts from plastic but as a model to demonstrate the entire unit would be really nice. An exploded diagram showing how the motor is attached to the wave generator. For example I can't quite figure out how you lock it onto the shaft. In my case John, I used a 3 phase motor that comes with an 8mm flatted shaft, powered it up to lock it and ground the flat quite a bit wider, then built the armature for a drive it on with a small hammer fit. Made the hub of the armature project out of the housing about 12mm, the thickness of the panel it mounts on to engage more of the shaft. No metal in the armature print, and in PETG more than strong enough even a 3NM motor won't auger it out. But a 1NM motor is a great plenty at a 30/1 ratio. I did claim I was cheap, the bearing are printed using loose bb's. If it breaks, make another for 5 bucks. John > -----Original Message----- > From: Sam Sokolik [mailto:samco...@gmail.com<mailto:samco...@gmail.com>] > Sent: December-01-21 8:50 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Harmonic Drive > > I have seen that video too! I watch too much youtube.. It doesn't really > look that strong.. mine stalled at 35ftlb or 47.45Nm > > Oh - I am officially a thingiverser... > > https://www.thingiverse.com/thing:5151905 > > > > > On Wed, Dec 1, 2021 at 10:24 PM Chris Albertson > <albertson.ch...@gmail.com<mailto:albertson.ch...@gmail.com>> > wrote: > > > 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<mailto: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<http://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<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<mailto: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<http://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<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<mailto: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<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<mailto: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<mailto:Emc-users@lists.sourceforge.net> > > > > > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > > Emc-users mailing list > > > > > > > Emc-users@lists.sourceforge.net<mailto: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<mailto:Emc-users@lists.sourceforge.net> > > > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > Emc-users mailing list > > > > > Emc-users@lists.sourceforge.net<mailto: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<mailto:Emc-users@lists.sourceforge.net> > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net<mailto: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<mailto:Emc-users@lists.sourceforge.net> > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net<mailto: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
