I still haven't been able to make a simple circle in FreeCAD. I keep looking for the Alibre way of doing it which for my brain has always been close to perfect. Never could use AutoCAD and I find Fusion360 confusing . However the gear tool is quite nice in FreeCAD.
I'm still having some problem visualizing exactly how the gears turn to create 67:1. So I thought I'd blow a bunch of money on filament and print them. In hindsight I should have expanded the pinion holes to 22mm since that's a standard (cheap) bearing size. Too late now. Just over 2 hours before the other 4 are done. I could make some tubes that hold smaller diameter ones. Or just play with the motion here first. See how it works and then decide if I want to use my module 1.0mm cutters to make them out of metal. Or just print ones with inset relief to hold 8x22x7 standard bearings. John > -----Original Message----- > From: Todd Zuercher [mailto:to...@pgrahamdunn.com] > Sent: December-15-21 1:10 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Harmonic Drive > > That is the 2nd version posted on 12/14/2021. The first version I posted on > 12/3/2021. The 1st one had outer gears with the same > outside and approximate inside diameters, and wonky module numbers, to try to > use the same size pinions for both. > > In the 2nd version that you are doing, I had tried to make the pinion pairs > one piece, by fusing a tube between the two of them. (I'm > not sure that it took.) > Did you add any provision for a bearing between the pinions and the spider > carrier? It would seem like that would be necessary for > a good working model. > > The module tooth shape was auto generated by Freecad using the Involute Gear > option in the Part Design work bench. I did not > "draw" them, just typed in a module number, and a number of teeth, Freecad > did the rest. It makes it stupid easy. > https://wiki.freecadweb.org/PartDesign_InvoluteGear What's even better just > clicking on the involute gear you created, lets you > change any of the parameters to either change the drawing you made or create > a new gear. With a few mouse clicks I was able to > redo the whole assembly to make one with 125t/126t ring gears and 50t/51t > pinions and a 1.0module that would be the same > overall sizes and should have reduction of 84:1. > > I guess there is also a more complex and capable separate Gear workbench for > Freecad, but I have not installed or played with it. > https://wiki.freecadweb.org/FCGear_Workbench > > There are a few Freecad tutorial videos that step through using these tools. > And they really make creating the gears and even the > harder things like laying out your gear center spacing child's play. > > Todd Zuercher > P. Graham Dunn Inc. > 630 Henry Street > Dalton, Ohio 44618 > Phone: (330)828-2105ext. 2031 > > -----Original Message----- > From: John Dammeyer <jo...@autoartisans.com> > Sent: Wednesday, December 15, 2021 2:00 PM > To: 'Enhanced Machine Controller (EMC)' <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Harmonic Drive > > [EXTERNAL EMAIL] Be sure links are safe. > > Yikes. Versions? I thought there was only one version. > Outer gears are the same OD, have different ID. Pinion gears are different > diameters due to extra tooth. > cid:image001.png@01D7F19F.CBD7A380 > I've printed one set of 2 pinions. And one outer gear (BLUE -- Cut1 with > 1.25 and 100T). Still to print is the other Gear (GREEN, -- > Cut001 with 1.25 and 101T) and 2 more pinion sets. > > I've created an input shaft. I'm guessing we hold the 100T gear fixed and > the 101T is the one turning at the 67:1 ratio when turning > the input shaft (pinion cluster). > > How do I know which version I'm printing? > > And more important, how did you create the module tooth shape? Under "Part > Design/Involute Gear"? > > I found this tutorial which goes through the nitty gritty. > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.fictiv.com%2Farticles%2Fcreating-involute-gears-in- > cad&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b6bb08d9bffd5ec7%7C5758544c573f47cebee96c > 3e0806fb43%7C0%7C0%7C637751917251001669%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTi > I6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=VSEzPKBH8f0nIqyRFjQoiQwoX9%2Bqx2x9FW%2FwFihGqmo%3D&reserve > d=0 > > John > > > > -----Original Message----- > > From: Todd Zuercher [mailto:to...@pgrahamdunn.com] > > Sent: December-15-21 6:32 AM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Harmonic Drive > > > > No reason, just picked a number, and that looked good to me. > > > > Which version are you trying to print? The ones with equal ring > > diameters and fudged module, or the one with proper module but differing > > diameters? > > > > Curious to hear how it works, and how strong it may or may not be. > > > > Todd Zuercher > > P. Graham Dunn Inc. > > 630 Henry Street > > Dalton, Ohio 44618 > > Phone: (330)828-2105ext. 2031 > > > > -----Original Message----- > > From: John Dammeyer < <mailto:jo...@autoartisans.com> > > jo...@autoartisans.com> > > Sent: Tuesday, December 14, 2021 6:53 PM > > To: 'Enhanced Machine Controller (EMC)' < > > <mailto:emc-users@lists.sourceforge.net> > > emc-users@lists.sourceforge.net> > > Subject: Re: [Emc-users] Harmonic Drive > > > > [EXTERNAL EMAIL] Be sure links are safe. > > > > I've opened it in FreeCAD. Exported the pieces as STEP files and imported > > those into AlibreCAD. I added holes in each pinion gear > > so that they can be screwed together. I've sliced it to sit on a 6 layer > > raft so that the teeth on the glass sided aren't all distorted. > > > > Time to print will be about 3 hours. Any reason why they are 20mm thick? > > Just for strength/power? > > > > The two outer ring gears got 12 holes on a 70mm radius. For some > > reason AlibreCAD shows the 12 holes on the sketch but the extrude cut > > leaves out a couple. I've posted a help request on that. > > > > The ring gears (0.3 mm layers) with a raft take over 5 hours, over 4 > > without the raft. > > > > I've started printing the two pinions. See what they look like. Then > > decide about the ring gears. Maybe print one to see how the pinions fit. > > Then look at the other ring gear and two more pinion > sets. And obviously will also have to design the pinion drive shaft. > > > > I imagine the assembly will end up looking something like the one that Sam > > built as a dual spline harmonic? > > > > John > > > > > > > -----Original Message----- > > > From: Todd Zuercher [ <mailto:to...@pgrahamdunn.com> > > > mailto:to...@pgrahamdunn.com] > > > Sent: December-14-21 11:40 AM > > > To: Enhanced Machine Controller (EMC) > > > Subject: Re: [Emc-users] Harmonic Drive > > > > > > It is a Freecad file, you have to open it with Freecad. (If I > > > double click on it in a file manager on a Linux pc I get that list > > > to.) > > > > > > Todd Zuercher > > > P. Graham Dunn Inc. > > > 630 Henry Street > > > Dalton, Ohio 44618 > > > Phone: (330)828-2105ext. 2031 > > > > > > -----Original Message----- > > > From: Gene Heskett < <mailto:ghesk...@shentel.net> > > > ghesk...@shentel.net> > > > Sent: Tuesday, December 14, 2021 1:53 PM > > > To: <mailto:emc-users@lists.sourceforge.net> > > > emc-users@lists.sourceforge.net > > > Subject: Re: [Emc-users] Harmonic Drive > > > > > > [EXTERNAL EMAIL] Be sure links are safe. > > > > > > On Tue, 14 Dec, 2021 at 1:07 PM, Todd Zuercher < > > > <mailto:to...@pgrahamdunn.com> to...@pgrahamdunn.com> wrote: > > > > > > > > > To: enhanced machine controller (emc) The "pinned" pinions are for > > > if they are to be conventionally made metal gears to accommodate easy > > > conventional manufacturing. > > > If they were printed, they could simply printed as one piece. A > > > metal set of gears would have be hobbed separately, then stacked and > > > offset at the correct angles then drilled and pinned together so > > they turn as one gear. > > > > > > Playing with the cad some more I'm not even sure that it would even > > > be necessary to fudge the modulus on the ring gears to make them > > > both the same diameter. But it comes at the cost of getting the > > > highest possible gear reduction. It is only 1.5 tooth/rev instead > > > of 1 tooth, but it is still better than the 2 tooth/rev max possible > > > with the true harmonic drives. (Although a true harmonic drive can > > > get away with and probably works better with finer/smaller teeth.) > > > For example if the fixed ring gear has 100 teeth, meshing with 3 > > > pinions of 40 teeth on the driven spider. (see attached pic) Then > > > on the output side adding one tooth to the ring gear(101) and > > > pinions(41) The teeth still mesh perfectly at the same spider axel > > > lengths. Then pin the 40 and 41 tooth pinions together. I think > > > the final drive ratio would be 67-1/3:1. One revolution of the > > > spider would turn the pinions 2.5 times, and advance the driven ring > > > gear > > > 1.5 teeth. (please correct me if I'm wrong in my calculations.) Also > > > I think making the output ring and pinions one tooth smaller instead > > > of larger keeps the ratio the same but reverses the output > > direction. Here is a link to the Freecad model. > > > > > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fd > > > riv> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdr > > > iv > > > e.google.com%2Ffile%2Fd%2F1QX6cw-&data=04%7C01%7Ctoddz%40pgraham > > > du > > > nn.com%7C48cd05236af94274e3a408d9bf5d17c0%7C5758544c573f47cebee96c3e > > > 08 > > > 06fb43%7C0%7C0%7C637751228834141105%7CUnknown%7CTWFpbGZsb3d8eyJWIjoi > > > MC > > > 4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000& > > > sd > > > ata=0p%2F4ye8YsxbrOGDldiclmTE%2FA88AzyMtTAl2W9jekIg%3D&reserved= > > > 0 > > > zHwiRNLSGqVZV_AoieQYPtvKRB%2Fview%3Fusp%3Dsharing&data=04%7C01%7 > > > Ct > > > oddz%40pgrahamdunn.com%7C5ce70ebbb > > > 0d143330dd508d9bf32e1f5%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7 > > > C6 > > > 37751048404394852%7CUnknown%7CTWFp > > > bGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6 > > > Mn 0%3D%7C3000&sdata=h1ePHRAQKLaTDCRls > > > HUxq3ODzsXgQAQEDzGg3nCfPyY%3D&reserved=0 > > > > > > > > > > > > This doesn't render here Todd, its a text list of colors. > > > > > > > > > Making the difference between driven and output two teeth, still works > > > out to mesh correctly but makes the output ratio 34:1. > > > (100t/40t:102t/42t) Which I think might be about the perfect ratio > > > for the rack and pinion drive on my router (to replace it's barely > > > adequate 10:1 belt.) However I'd probably be better off simply > > > buying a readily available off the shelf 30:1 planetary gear box for > > that. > > > > > > > > > > > > Were I to do that idea in openscad, I'd union the two different pinions > > > and print 4 of them. > > > Not having access to your model, probably a mimetype error here, do > > > you have an axle bearing per gear, or could I just use one gear per > > > unionized pair? It seems to me that both bearings would be > > needed to resist the twisting moment on the pinions under load. > > > I've now installed freecad, and will dl the link and see if that will > > > show me what you have. > > > > > > Todd Zuercher > > > P. Graham Dunn Inc. > > > 630 Henry Street > > > Dalton, Ohio 44618 > > > Phone: (330)828-2105ext. 2031 > > > > > > -----Original Message----- > > > From: John Dammeyer > > > < <mailto:jo...@autoartisans.com%3cmailto:jo...@autoartisans.com> > > > jo...@autoartisans.com<mailto:jo...@autoartisans.com>> > > > Sent: Tuesday, December 14, 2021 12:30 AM > > > To: 'Enhanced Machine Controller (EMC)' > > > <emc-users@lists.sourceforge.net<mailto:emc-users@lists.sourceforge. > > > ne > > > t>> > > > Subject: Re: [Emc-users] Harmonic Drive > > > > > > [EXTERNAL EMAIL] Be sure links are safe. > > > > > > Todd, > > > I'm not sure I 'get' how it works with the pinned gears. > > > > > > I built a different kind of flex cup drive based on a paper on what > > > is called an HGD_EWG_Drive > > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww> > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww. > > > geartechnology.com%2Fissues%2F1013x%2Fharmoni&data=04%7C01%7Ctod > > > dz > > > %40pgrahamdunn.com%7C48cd05236af94274e3a408d9bf5d17c0%7C5758544c573f > > > 47 > > > cebee96c3e0806fb43%7C0%7C0%7C637751228834141105%7CUnknown%7CTWFpbGZs > > > b3 > > > d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D > > > %7 > > > C3000&sdata=VOwRT5Ol5WFCP9lJXpronQGU6KEJd6R5OoaBRHLzFHk%3D&r > > > es > > > erved=0 > > > c_drive.pdf&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C5ce70ebbb0d > > > 14 3330dd508d9bf32e1f5%7C5758544c573f47c > > > ebee96c3e0806fb43%7C0%7C0%7C637751048404404837%7CUnknown%7CTWFpbGZsb > > > 3d > > > 8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM > > > zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=sqS9DyYADHEEp2K6X > > > U9 8Jl%2FtEHd%2FuVsehu7vaajW8Fk%3D&r > > > eserved=0 > > > > > > Here's a really short video of the version of one I created. I used > > > that earlier 3D print harmonic drive for the base tooth form > > > although this type looks like you can use involute profile or even belt > > > profile as the flex teeth follow a circular rather than > elliptical gear. > > Something to play with now that I have some PETG. > > > > > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fy > > > out> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyo > > > ut > > > u.be%2Flb6shTgQ1wY&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C48cd > > > 05 > > > 236af94274e3a408d9bf5d17c0%7C5758544c573f47cebee96c3e0806fb43%7C0%7C > > > 0% > > > 7C637751228834141105%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJ > > > QI > > > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=RhWq7Ob1O > > > tP > > > w7ewh%2FjHitjP1dGV2oyn0BlV59D5nwVQ%3D&reserved=0 > > > %40pgrahamdunn.com%7C5ce70ebbb0d143330dd508d9bf32e1f5%7C5758544c573f > > > 47 > > > cebee96c3e0806fb43%7C0%7C0%7C637751 > > > 048404404837%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2l > > > uM zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C > > > 3000&sdata=L1ZCbk4vQLNwth%2BjgY7JpQQh1a6LD9UN6ePO7Kk5Z2o%3D& > > > re > > > served=0 > > > > > > I really need to bring in a bigger stepper to play with this. The > > > surplus unit with about 1A at 36V will stall if I even look at it cross > > > eyed. > > > > > > Here's the original I was playing with along side the new one. > > > > > > <https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fww > > > w.a%2F&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585 > > > b6bb08d9bffd5ec7%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C637751 > > > 917251001669%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2l > > > uMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=1IrA7KzaMPq1nzE > > > 7D79mP0oW2rkHmTGLDVzWKWLkXJ8%3D&reserved=0> > > > https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww > > > .a%2F&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b > > > 6bb08d9bffd5ec7%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C6377519 > > > 17251001669%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2lu > > > MzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=1IrA7KzaMPq1nzE7 > > > D79mP0oW2rkHmTGLDVzWKWLkXJ8%3D&reserved=0 > > > utoartisans.com%2Fharmonicdrive%2FHarmonicDrive&data=04%7C01%7Ct > > > od > > > dz%40pgrahamdunn.com%7C48cd05236af94274e3a408d9bf5d17c0%7C5758544c57 > > > 3f > > > 47cebee96c3e0806fb43%7C0%7C0%7C637751228834141105%7CUnknown%7CTWFpbG > > > Zs > > > b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% > > > 3D > > > %7C3000&sdata=DngsWxx6Z9c79ch3EMu1f5P4lcHBY8yqyeRz3zOEeuY%3D& > > > ;r > > > eserved=0 > > > - > > > 35.jpg&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C5ce70ebbb0d14333 > > > 0d d508d9bf32e1f5%7C5758544c573f47cebee > > > 96c3e0806fb43%7C0%7C0%7C637751048404404837%7CUnknown%7CTWFpbGZsb3d8e > > > yJ > > > WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLC > > > JBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=ee87%2FTZuN1zEfVCblcYS > > > Cn xYyJhVwGscGNyrzoy5M%2Bs%3D&reser > > > ved=0 > > > > > > I still don't have the right size bearings but did have these tiny > > > ones I bought 20 years ago at a model aircraft show in the UK. So I > > > created bearings that were 22mm diameter. Big issue there > > they were really only 21.3mm after printing and that caused all sorts > > of > > > issues because I forgot that detail. I then printed some oversize, > > > created an arbor for them on the lathe and turned them down > to > > > 22mm. Now I get 100% connection and zero backlash. This things > > > spins so smoothly just by placing a finger on the wave cup driver and > > > pushing it around. And you can't hold onto the output. > > > > > > > > > <https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fww > > > w.a%2F&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585 > > > b6bb08d9bffd5ec7%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C637751 > > > 917251001669%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2l > > > uMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=1IrA7KzaMPq1nzE > > > 7D79mP0oW2rkHmTGLDVzWKWLkXJ8%3D&reserved=0> > > > https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww > > > .a%2F&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b > > > 6bb08d9bffd5ec7%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C6377519 > > > 17251011659%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2lu > > > MzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=jHQryztFJneDoTyU > > > SfrBmmSSp6XTVc%2Bq5gM4p6duZlc%3D&reserved=0 > > > utoartisans.com%2Fharmonicdrive%2FHarmonicDrive&data=04%7C01%7Ct > > > od > > > dz%40pgrahamdunn.com%7C48cd05236af94274e3a408d9bf5d17c0%7C5758544c57 > > > 3f > > > 47cebee96c3e0806fb43%7C0%7C0%7C637751228834141105%7CUnknown%7CTWFpbG > > > Zs > > > b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% > > > 3D > > > %7C3000&sdata=DngsWxx6Z9c79ch3EMu1f5P4lcHBY8yqyeRz3zOEeuY%3D& > > > ;r > > > eserved=0 > > > - > > > 29.jpg&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C5ce70ebbb0d14333 > > > 0d d508d9bf32e1f5%7C5758544c573f47cebee > > > 96c3e0806fb43%7C0%7C0%7C637751048404404837%7CUnknown%7CTWFpbGZsb3d8e > > > yJ > > > WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLC > > > JBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=98y0KPsDgP0XL%2FwerNJs > > > D4 C0iXkSYx3PIXPoI%2FNy1WU%3D&reserv > > > ed=0 > > > > > > And here's a diagram of most of the bits and pieces. > > > > > > <https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fww > > > w.a%2F&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585 > > > b6bb08d9bffd5ec7%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C637751 > > > 917251011659%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2l > > > uMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=jHQryztFJneDoTy > > > USfrBmmSSp6XTVc%2Bq5gM4p6duZlc%3D&reserved=0> > > > https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww > > > .a%2F&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b > > > 6bb08d9bffd5ec7%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C6377519 > > > 17251011659%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2lu > > > MzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=jHQryztFJneDoTyU > > > SfrBmmSSp6XTVc%2Bq5gM4p6duZlc%3D&reserved=0 > > > utoartisans.com%2Fharmonicdrive%2FHarmonicDrive&data=04%7C01%7Ct > > > od > > > dz%40pgrahamdunn.com%7C48cd05236af94274e3a408d9bf5d17c0%7C5758544c57 > > > 3f > > > 47cebee96c3e0806fb43%7C0%7C0%7C637751228834141105%7CUnknown%7CTWFpbG > > > Zs > > > b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% > > > 3D > > > %7C3000&sdata=DngsWxx6Z9c79ch3EMu1f5P4lcHBY8yqyeRz3zOEeuY%3D& > > > ;r > > > eserved=0 > > > - > > > 28.jpg&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C5ce70ebbb0d14333 > > > 0d d508d9bf32e1f5%7C5758544c573f47cebee > > > 96c3e0806fb43%7C0%7C0%7C637751048404404837%7CUnknown%7CTWFpbGZsb3d8e > > > yJ > > > WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLC > > > JBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=rdvZ%2B4gMMR8YZX4iZCMJ > > > nZ > > > QY41q82NsnTQCCcG8%2Faw4%3D&re > > > served=0 > > > > > > The main bearings are utility trailer 1" ID roller bearings. I'm > > > waiting for 6101 and 6103 bearings to arrive. Most of the parts will be > > > made from metal. > > > > > > John Dammeyer > > > > > > > > > > -----Original Message----- > > > > From: Todd Zuercher > > > > [ <mailto:to...@pgrahamdunn.com%3cmailto:to...@pgrahamdunn.com%3e> > > > > mailto:to...@pgrahamdunn.com<mailto:to...@pgrahamdunn.com>] > > > > Sent: December-03-21 8:37 AM > > > > To: Enhanced Machine Controller (EMC) > > > > Subject: Re: [Emc-users] Harmonic Drive > > > > > > > > It was easier to model in Freecad than I expected. I'll try to attach > > > > a jpg of it and see if it goes through. > > > > > > > > And if it doesn't go through a link to it on my Google drive. > > > > > > > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2 > > > > Fdr> > > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2F > > > > dr > > > > iv > > > > e.google.com%2Ffile%2Fd%2F1_eSu-olALMsevTnOpzQ1o1r_rPjfexwU%2Fview > > > > %3 > > > > Fu > > > > sp%3Dsharing&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C5ce70ebb > > > > b0 > > > > d1 > > > > 43330dd508d9bf32e1f5%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C > > > > 63 > > > > 77 > > > > 51048404404837%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjo > > > > iV > > > > 2l > > > > uMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=kFLK8IVVRbugQ > > > > ye > > > > Ts > > > > Zl77AYP%2BQsgwBuVgrvUjR9ysb4%3D&reserved=0 > > > > > > > > Here is a link to the Freecad file (Freecad v0.18). > > > > > > > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2 > > > > Fdr> > > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2F > > > > dr > > > > iv > > > > e.google.com%2Ffile%2Fd%2F1GGwG9nzmYowKeuMAWMvOExeGrvSzZCnY%2Fview > > > > %3 > > > > Fu > > > > sp%3Dsharing&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C5ce70ebb > > > > b0 > > > > d1 > > > > 43330dd508d9bf32e1f5%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C > > > > 63 > > > > 77 > > > > 51048404404837%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjo > > > > iV > > > > 2l > > > > uMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=GePtOJMld%2Fr > > > > rT > > > > Nk > > > > HQTQRqAUXh6OWIGDv8Ry8p2%2FoMTo%3D&reserved=0 > > > > > > > > > > > > Todd Zuercher > > > > P. Graham Dunn Inc. > > > > 630 Henry Street > > > > Dalton, Ohio 44618 > > > > Phone: (330)828-2105ext. 2031 > > > > > > > > -----Original Message----- > > > > From: Andy Pugh < > > > > <mailto:bodge...@gmail.com%3cmailto:bodge...@gmail.com> > > > > bodge...@gmail.com<mailto:bodge...@gmail.com>> > > > > Sent: Thursday, December 02, 2021 6:40 PM > > > > To: Enhanced Machine Controller (EMC) > > > > <emc-users@lists.sourceforge.net<mailto:emc-users@lists.sourceforge. > > > > ne > > > > t>> > > > > Subject: Re: [Emc-users] Harmonic Drive > > > > > > > > [EXTERNAL EMAIL] Be sure links are safe. > > > > > > > > > On 2 Dec 2021, at 21:14, Todd Zuercher < > > > > > <mailto:to...@pgrahamdunn.com%3cmailto:to...@pgrahamdunn.com> > to...@pgrahamdunn.com<mailto:to...@pgrahamdunn.com>> wrote: > > > > > > > > > > What if you used two outer ring gears of the same diameter one > > > > > with one fewer teeth. Then have 4 sets of planetaries stacked > > > > > in > > > > pairs. Each pair would be pinned together > > > > > > > > You can just use pinions twice as long as the ring gears. I think > > > > I have seen this done > > > > > > > > It would work with all-external gears too. > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > Emc-users mailing list > > > > > > > > <mailto:Emc-users@lists.sourceforge.net%3cmailto:Emc-users@lists.s > > > > ourceforge.n> > > > > Emc-users@lists.sourceforge.net<mailto:Emc-users@lists.sourceforge > > > > .n > > > > et > > > > > > > > > > > > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2 > > > > Fli> > > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2F > > > > li > > > > st > > > > s.sourceforge.net%2Flists%2Flistinfo%2Femc-&data=04%7C01%7Ctod > > > > dz > > > > %4 > > > > 0pgrahamdunn.com%7C5ce70ebbb0d143330dd508d9bf32e1f5%7C5758544c573f > > > > 47 > > > > ce > > > > bee96c3e0806fb43%7C0%7C0%7C637751048404404837%7CUnknown%7CTWFpbGZs > > > > b3 > > > > d8 > > > > eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D > > > > %7 > > > > C3 > > > > 000&sdata=pqeO%2FLq%2FcybqqS5iWHkNI2aKp%2BeQi12xvTnziOJVgJA%3D > > > > &a > > > > mp > > > > ;reserved=0 > > > > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7Ce891b8fadd88429 > > > > 7a > > > > 79 > > > > 608d9b5ed4669%7C5758544c573f47cebee9 > > > > 6c3e0806fb43%7C0%7C0%7C637740852975732935%7CUnknown%7CTWFpbGZsb3d8 > > > > ey > > > > JW > > > > IjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > > > > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=16s%2BM61vPdzTAtr3Qg6 > > > > tt Yn RU6%2Fg4vkOsrYcbPRxmuY%3D&reserv > > > > ed=0 > > > > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > > > > <mailto:Emc-users@lists.sourceforge.net%3cmailto:emc-us...@lists.sou > > > rceforge.net> > > > Emc-users@lists.sourceforge.net<mailto:Emc-users@lists.sourceforge.n > > > et > > > > > > > > > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fl > > > ist> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fli > > > st > > > s.sourceforge.net%2Flists%2Flistinfo%2Femc-&data=04%7C01%7Ctoddz > > > %4 > > > 0pgrahamdunn.com%7C48cd05236af94274e3a408d9bf5d17c0%7C5758544c573f47 > > > ce > > > bee96c3e0806fb43%7C0%7C0%7C637751228834151099%7CUnknown%7CTWFpbGZsb3 > > > d8 > > > eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7 > > > C3 > > > 000&sdata=qAc5EddzjCwZp6n38C6Ak5VpVHSeIiOFmxpylPic%2Fsc%3D&r > > > es > > > erved=0 > > > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C5ce70ebbb0d143330 > > > dd > > > 508d9bf32e1f5%7C5758544c573f47cebee9 > > > 6c3e0806fb43%7C0%7C0%7C637751048404404837%7CUnknown%7CTWFpbGZsb3d8ey > > > JW > > > IjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > > > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=G2%2BTBO5nRNBAppBprf6PD > > > t% > > > 2FR8nCJRCruQMI6o5%2FbeVY%3D&r > > > eserved=0 > > > > > > _______________________________________________ > > > Emc-users mailing list > > > <mailto:Emc-users@lists.sourceforge.net> > > > Emc-users@lists.sourceforge.net > > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fl > > > ist> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fli > > > st > > > s.sourceforge.net%2Flists%2Flistinfo%2Femc-&data=04%7C01%7Ctoddz > > > %4 > > > 0pgrahamdunn.com%7C48cd05236af94274e3a408d9bf5d17c0%7C5758544c573f47 > > > ce > > > bee96c3e0806fb43%7C0%7C0%7C637751228834151099%7CUnknown%7CTWFpbGZsb3 > > > d8 > > > eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7 > > > C3 > > > 000&sdata=qAc5EddzjCwZp6n38C6Ak5VpVHSeIiOFmxpylPic%2Fsc%3D&r > > > es > > > erved=0 > > > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C5ce70ebbb0d143330 > > > dd > > > 508d9bf32e1f5%7C5758544c573f47cebee9 > > > 6c3e0806fb43%7C0%7C0%7C637751048404404837%7CUnknown%7CTWFpbGZsb3d8ey > > > JW > > > IjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > > > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=G2%2BTBO5nRNBAppBprf6PD > > > t% > > > 2FR8nCJRCruQMI6o5%2FbeVY%3D&r > > > eserved=0 > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > <mailto:Emc-users@lists.sourceforge.net> > > > Emc-users@lists.sourceforge.net > > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fl > > > ist> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fli > > > st > > > s.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7C > > > to > > > ddz%40pgrahamdunn.com%7C48cd05236af94274e3a408d9bf5d17c0%7C5758544c5 > > > 73 > > > f47cebee96c3e0806fb43%7C0%7C0%7C637751228834151099%7CUnknown%7CTWFpb > > > GZ > > > sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0 > > > %3 > > > D%7C3000&sdata=k67NThmBsFQoqonsx%2ByC1Kd1jXrHcE%2F9R9U6EmlizIM%3 > > > D& > > > amp;reserved=0 > > > > > > > > _______________________________________________ > > Emc-users mailing list > > <mailto:Emc-users@lists.sourceforge.net> > > Emc-users@lists.sourceforge.net > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flis > > ts.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Ct > > oddz%40pgrahamdunn.com%7C42c03c6c9ed34585b6bb08d9bffd5ec7%7C5758544c57 > > 3f47cebee96c3e0806fb43%7C0%7C0%7C637751917251011659%7CUnknown%7CTWFpbG > > Zsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% > > 3D%7C3000&sdata=uVjdoKhCDu%2F0Kb161USXsSaelYL2P4hDGv8JBfgcb8s%3D&a > > mp;reserved=0> > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist > > s.sourceforge.net%2Flists%2Flistinfo%2Femc-&data=04%7C01%7Ctoddz%4 > > 0pgrahamdunn.com%7C42c03c6c9ed34585b6bb08d9bffd5ec7%7C5758544c573f47ce > > bee96c3e0806fb43%7C0%7C0%7C637751917251011659%7CUnknown%7CTWFpbGZsb3d8 > > eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3 > > 000&sdata=9OQH8uVSNIMFMgXMPcqRu6ehQD1M6o%2F9M9XrSfOIu6g%3D&res > > erved=0 > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc- > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b6bb08d9bffd5ec7%7C5758544c573f47cebee9 > 6c3e0806fb43%7C0%7C0%7C637751917251011659%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=uVjdoKhCDu%2F0Kb161USXsSaelYL2P4hDGv8JBfgcb8s%3D&reserved= > 0> > > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C48cd05236af94274e3a408d9bf5d17c0%7C5758544c573f47cebee9 > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc- > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b6bb08d9bffd5ec7%7C5758544c573f47cebee9 > 6c3e0806fb43%7C0%7C0%7C637751917251011659%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=uVjdoKhCDu%2F0Kb161USXsSaelYL2P4hDGv8JBfgcb8s%3D&reserved= > 0> > > 6c3e0806fb43%7C0%7C0%7C637751228834151099%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc- > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b6bb08d9bffd5ec7%7C5758544c573f47cebee9 > 6c3e0806fb43%7C0%7C0%7C637751917251011659%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=uVjdoKhCDu%2F0Kb161USXsSaelYL2P4hDGv8JBfgcb8s%3D&reserved= > 0> > > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=k67NThmBsFQoqonsx%2ByC1Kd1jXrHcE%2F9R9U6EmlizIM%3D&reser > > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc- > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b6bb08d9bffd5ec7%7C5758544c573f47cebee9 > 6c3e0806fb43%7C0%7C0%7C637751917251011659%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=uVjdoKhCDu%2F0Kb161USXsSaelYL2P4hDGv8JBfgcb8s%3D&reserved= > 0> > ved=0 > > > > > > _______________________________________________ > > Emc-users mailing list > > <mailto:Emc-users@lists.sourceforge.net> > > Emc-users@lists.sourceforge.net > <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc- > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b6bb08d9bffd5ec7%7C5758544c573f47cebee9 > 6c3e0806fb43%7C0%7C0%7C637751917251011659%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=uVjdoKhCDu%2F0Kb161USXsSaelYL2P4hDGv8JBfgcb8s%3D&reserved= > 0> > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc- > users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7C42c03c6c9ed34585b6bb08d9bffd5ec7%7C5758544c573f47cebee9 > 6c3e0806fb43%7C0%7C0%7C637751917251021669%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ > BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xy5%2B9c4wYBwc7ETSE9CnYwlL9oQaLPY5s04LmtFbtMU%3D&reserve > d=0 > > > _______________________________________________ > 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
