On Friday 30 April 2021 23:25:43 ken.stra...@gmail.com wrote: > I haven't been following your project recently but am intrigued by > "And it turns the armature easy enough the 3NM 3 phase motor (those > are magic folks, running 50C cooler than 2 phase stuff) I'll use will > not be a bit overstressed." Where did you end up getting your motors > and what are you using for drivers? > Ebay for all of them. There are 2 phase with feedback but they work at full motor currants all the time. The only driver that counts and really is 3 phase is the LCDA357H although I expect it will grow bigger brother versions as time goes by and folks become aware of them. The chinese are not heavly advertizing that, the difference getting lost in the translation or ???.
Motor wires are labeled UVW just like a vfd. And a full step is 1.2 degrees, not 1.8. An encoder on the back of the motor talks to the driver, not to LCNC, and you drive them exactly as you would any other stepper setup. Step speeds are still limited by the input opto's to maybe 250 kilohertz. It, the LCDA3576H driver is small, about the size of a 100 mil pack of smokes, has no currant setting switches because the motor current is determined by the magnitude of the error. Makes it at least 5x more efficient. Rated at 20-50 VDC input, there are 1,2, & 3 NM sizes that I know of right now. Running my 11x54 Sheldon with rapids 2x faster than the 2 phase stuff I took off, motor heating might be 5F. And if they lose a step, they have an error out that can shut down LCNC with the e-stop circuit. Highly recommended by great, great, grandpa Gene as a genuine improvement in stepper technology. > -----Original Message----- > From: Gene Heskett <ghesk...@shentel.net> > Sent: April 30, 2021 10:45 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive? > > On Monday 22 March 2021 09:19:19 Sam Sokolik wrote: > > 202,200 for the outside spline and the flex gear is 200. In this > > situation - the 202 tooth spline is stationary to the stepper. The > > 200 tooth outside spline is mounted to the faceplate. In this > > layout - the ratio apears to be 101:1 > > > > In this situation the stepper motor and the face plate spin the same > > direction. > > > > With the same set of outside spines swapped - the ratio is 100:1 > > > > I am sure Andy can explain it. It doesn't make sense to me. > > > > Happy with runout... https://www.youtube.com/watch?v=eLyP2YwdstQ > > > > sam > > I am running some behind you Sam, with my project, having printer > problems kills time and money. Finally settled on an ender 5 Plus, > which is working passably well but I've wasted $3k getting there. > > Any way, I changed the design some from yours, to a 30/1 because those > big spines print better, and by making my own bearings in openscad, > useing crosman bb's for balls. I put a huge one with over 150 loose > bb's directly on the outside of the moving spline, with only the lip > of the output coupling disc (printed of course) interposed. And the > floating spline has 3 more of those, sized for a good friction fit > inside that spline, with both the spline and the bearings made as thin > as practical to improve the flex life, and I just took the eliptical > armature off the build plate and wiggled in into those 3 bearings > inside the loose spline, so thats the driver armature, no commercial > ball bearings anyplace like yours. I've made the 8mm hole in the > plastic for the motor shaft into a prominent D-flat, and used a cbn > wheel to make the flat much wider on the motor shaft, and this > armature will be driven onto the motor shaft without any grub screws > at all. No clue how long it will run before it bores that hole out and > I have to make an alu inner for it. :( > > But I just now assembled it without the motor, turning the armature by > hand, and it works, with no detectable backlash. And it turns the > armature easy enough the 3NM 3 phase motor (those are magic folks, > running 50C cooler than 2 phase stuff) I'll use will not be a bit > overstressed. Those bb's will pound the plastic smooth and get > smoother with use. > > So now its time to finish the output shaft, and make the rest of the > housing. Which will be supported by the big bearing at the spline end, > and 4 of the printed bearings at the load end. I've got the motor end > gnawed out of some 1" stock I had, and I bought a foot of 3.125" thick > by 6" wide stuff so I can make 2 output housings. That showed me the > current price for extruded alu, scary. I also bought enough rod to > make about 4 output shafts, over $200. And I've a spare 4" chuck from > a TLM upgrade to a 5" to use on it. Or better yet, buy another 5" from > LMS. > So I'll get there, if I don't fall over first. At my age, thats always > a possibility. > > I'll try to get some pix of what I've got so far, put up on my web > page over the weekend. Along with some of the openscad source files. > > As usual, this stuff keeps me alone, safe, and out of the bars. :-) > > 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) > 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) 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
