On Monday, December 20, 2021 7:03:21 PM EST John Dammeyer wrote: > Perhaps save it as a step file or iges. I can't read that scad file. I don't think it can output those non-free formats.
OpenSCAD exports an .stl, ready for cura.. And if you go clear to the bottom of the downloads page the December release is available as an AppImage which doesn't need anything else to run except in this case, the latest glibc. There are earlier versions in case your install is buster or older. Runs on mac's and winderz too. I don't think there's anything in my code that won't run on the earlier January 2021 AppImage though. OpenSCAD is under steady development, getting faster and better with each new release. The .scad file is pure text, editable in any editor worth calling an editor. That leaves gedit out, but geany works well as does its own editor. > > -----Original Message----- > > From: gene heskett [mailto:ghesk...@shentel.net] > > Sent: December-20-21 3:10 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Harmonic Drive > > > > On Monday, December 20, 2021 1:49:18 PM EST Chris Albertson wrote: > > > Yes, he used maybe 30 pounds of metal parts. And I only saw a few > > > degrees > > > of rotation in the video, run it for 100 hours and see what happens. > > > Flex > > > is what kills the plastic so after 100 hours it will have had a few > > > million > > > cycles. But still it is 99% made of metal. > > > > > > I want to see a 100% plastic unit stand up to 100 hours of use. It can > > > be > > > done but not if the plastic parts flex. > > > > Yes it can be done, the drive I posted the openscad file for last week, > > made out of petg, has been sitting on my kitchen counter, running at 400 > > to 600 rpms input, since the middle of September. How many hours is that > > assuming a 24 hr day? > > > > > On Mon, Dec 20, 2021 at 10:39 AM Sam Sokolik <samco...@gmail.com> wrote: > > > > Did you watch this video til the end? I time stamped it. > > > > > > > > https://youtu.be/eW1GGI55Epc?t=878 > > > > > > > > sam > > > > > > > > > > > > > > > > On Mon, Dec 20, 2021 at 12:26 PM Chris Albertson < > > > > albertson.ch...@gmail.com> > > > > > > > > wrote: > > > > > On Fri, Dec 17, 2021 at 6:05 PM Sam Sokolik <samco...@gmail.com> wrote: > > > > > > Hmm - seems we are making things a bit more complicated than they > > > > > > need > > > > > > > > to > > > > > > > > > > be.. Why didn't the simple flex gear work ok? You need to make > > > > > > the > > > > > > system with fine enough splines that the flexure is at a > > > > > > minimum... > > > > > > > > > > You > > > > > > > > > > > can lower the backlash to a minimum by applying a small amount of > > > > > > pressure to the system. > > > > > > > > > > The problem with small splines is that he is making this with > > > > > printed > > > > > plastic. There is a minimum feature size that works. Seriously > > > > > you > > > > > > > > want > > > > > > > > > to stay above module 0.5 and bigger if you can. Mod 1.0 is more > > > > > realistic There are two reasons. (1) plastic is not very strong > > > > > unless > > > > > you make the parts big and (2) the printer makes parts with > > > > > dimensional > > > > > tolerances of about 0.4 mm so if your parts have 1mm features you > > > > > can > > > > > expect 50% dimensional errors. That said, modulo 1.0 gears work > > > > > really > > > > > well. Smaler ones have a short life. > > > > > > > > > > Finally ANY flexing at all is the death of printed parts. They fail > > > > > by > > > > > > > > the > > > > > > > > > failure of interlayer adhesion. Think of printed plastic like it is > > > > > soft > > > > > pine wood. When making gears from yellow pine, the direction of the > > > > > > > > grain > > > > > > > > > matters a lot and no one would think of making module 0.5 gears with > > > > > > > > pine. > > > > > > > > > I've been able to build an entire CNC conversion kit for a mini-mill > > > > > from > > > > > printed plastic. The stuff is VERY rigid and strong if you make the > > > > > > > > parts > > > > > > > > > large enough > > > > > > > > > > > sam > > > > > > > > > > > > On Fri, Dec 17, 2021 at 7:46 PM John Dammeyer > > > > > > <jo...@autoartisans.com> > > > > > > > > > > > > wrote: > > > > > > > Alright. So it spins really freely but keeping the planetary > > > > > > > cluster > > > > > > > centred is a bit of an issue. So the attached photo shows > > > > > > > roughly > > > > > > > > > > (very > > > > > > > > > > > > roughly) what I had in mind. > > > > > > > > > > > > > > With the right coupler between the motor and the gear cluster > > > > > > > the > > > > > > > planetary assembly should stay in the same place. There really > > > > > > > isn't > > > > > > > > > > any > > > > > > > > > > > > axial load. There is a place for a 40mmx19mm bearing that I > > > > > > > happen > > > > > > > > to > > > > > > > > > > have > > > > > > > > > > > > > on hand. > > > > > > > > > > > > > > But what about the driven ring gear? In one of the model shops > > > > > > > > today I > > > > > > > > > > > saw a package of 100 5.5mm stainless steel balls they sell for > > > > > > > > putting > > > > > > > > > > into > > > > > > > > > > > > > paint bottles to help mix them up. > > > > > > > > > > > > > > Seemed and ideal size for a bearing race between the two ring > > > > > > > gears. > > > > > > > > > > > > Kind > > > > > > > > > > > > > of like what Gene H. stated he did on his setup. (Pictures?) > > > > > > > So > > > > > > > the > > > > > > > > > > > > Blue > > > > > > > > > > > > > Gear is fixed. The Green Rotates. The lazy susan like bearing > > > > > > > > between > > > > > > > > > > > handles axial pressure in the direction of the blue gear. But > > > > > > > really > > > > > > > > > > the > > > > > > > > > > > > only thing holding up the green ring gear is the planetary > > > > > > > assembly. > > > > > > > > > > > > > > Say we wanted to mount a face plate or chuck onto the green > > > > > > > gear. > > > > > > > > I'm > > > > > > > > > > > open to ideas on how to stabilize that. Sketches would be > > > > > > > great. > > > > > > > > > > > > > > Methinks a part that surrounds the blue gear and extends over > > > > > > > the > > > > > > > > green > > > > > > > > > > > and they also have a bearing race between. Or we make a similar > > > > > > > > > > bearing > > > > > > > > > > > > mount to the rear one for the front with the gear cluster > > > > > > > holding > > > > > > > > this > > > > > > > > > in > > > > > > > > > > > > place extended out to the bearing. Now the faceplate is > > > > > > > attached to > > > > > > > > > > > > this. > > > > > > > > > > > > > But a lot more axial twist on the small bearing in the middle. > > > > > > > > > > > > > > Thanks > > > > > > > John > > > > > > > > > > > > > > _______________________________________________ > > > > > > > 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 > > > > Cheers, Gene Heskett. > > -- > > > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > > > -Ed Howdershelt (Author, 1940) > > If we desire respect for the law, we must first make the law respectable. > > > > - Louis D. Brandeis > > > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > > > > > > > _______________________________________________ > > 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 > . Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
