On Monday, January 16, 2012 05:19:37 PM Cathrine Hribar did opine: > On Mon, 16 Jan 2012 16:28:58 -0500 > > gene heskett <ghesk...@wdtv.com> wrote: > > On Monday, January 16, 2012 04:07:22 PM Cathrine Hribar did opine: > >> Hi Gene: > >> > >> Could you give me some idea of what the advantage is of using 2 and 3 > >> stack steppers? You seem to know a lot and I hope you don't mind me > >> asking dumb questions. > >> > >> Thanks > >> > >> Bill > > > > As I see it, its a tradeoff, you can get torque approaching a nema 34 > > motor in the nema 23 size form, that because the armature has a > > smaller OD, can probably run at faster accelerating rates than the > > larger nema 34. Weight hanging on the end of the table looks like it > > might be less, even with the so-called triple stack, longer & > > therefore heavier motors. In my case, figuring out how to make > > couplings that are shorter would have allowed me to put mine closer > > to the end of the tables, reducing the lever arm of the weight whose > > cg is likely a good 6" outward. Moving that inward an inch and a > > half would I'm sure make a detectable improvement. > > > > All this is pure opinion however, and there are folks here on this > > list that can stand on much firmer ground when they write on the > > subject. OTOH, it also seems to me that the nema 34 motor should be > > a wee bit more efficient in terms of amps in vs oz/in out. But I'd > > expect one can get arguments started just on that aspect alone. > > > > An true expert I am not at this, I am a 100% self taught (and poor > > teacher at times too) retired tv broadcast engineer with only a GED, > > CET on the wall. And a degree UHK (University of Hard Knocks) since > > I'm only 30 miles from them & had a few bucks to spare. > > > > There are some decent tutorials on steppers available on the net, many > > of which I think start at a bit too basic a level, but they do fairly > > well cover the subject. But I'd also expect that you've done that > > bit of homework already. > > > > Cheers, Gene > > Thanks for ur reply.. > > are u saying that the nema 34 would be equal to a nema 23 three stack? > A short one maybe. There are 34's out there that could twist the shaft out of a 23. But to get real speeds I'd expect to see 80+ volt power supplies.
> Bill > > ------------------------------------------------------------------------ > ------ Keep Your Developer Skills Current with LearnDevNow! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> "The jig's up, Elman." "Which jig?" -- Jeff Elman ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
