On Wednesday 09 December 2009, Kirk Wallace wrote: >On Wed, 2009-12-09 at 11:30 -0600, Jon Elson wrote: >> Martin Pinkston wrote: >> > The stepper motors are thought to be MAE motors. I have gone to MAE >> >> web site and I can't find the motors. No surprise there, they are over >> 20 years old. But I think they are either 2 or 3 amp motors. The MS3 >> in the model number > makes me think 3 amp motors. These motors have 4 >> wires feeding them red, > green, black and white. They are 6.5 ohm >> across the two fields. The physical size of the motors are 3.5" in >> diameter and 4" long with an output shaft out the face and back. >> >> If these are classic stepper motors, then you should be able to re-use >> them, but they may be quite sub-optimal. 3 A at 6.5 Ohm is 19.5 >> Volts. These motors may be pretty slow compared to more modern >> motors. > >... snip > >> controller. Since these are not going to be microstepping drives, I >> would strongly suggest you get rid of them. Their performance will be >> SO FAR below a modern microstepping drive that it is hard for the >> uninitiated to believe there could be such a difference. The only >> possible reason to try to re-use these drives is so that when you >> finally move up to a Gecko drive you will appreciate how good their >> drives are! >> >> Jon > >I would tend to disagree with your disagreement, at least in my case. My >Shizuoka works very well with the the original motors and drives. I >think that if the system under consideration was a higher quality system >to begin with, then with EMC2, it should perform just as well as the >original. Centroid makes a good product, so my guess is, an EMC2 upgrade >would work well. In my case, I was able to upgrade with very little >investment (break-out board, VFD, glue), and gets me by until I can >justify a servo upgrade. > >The 3 amp limit was a guess from the original post, so I wouldn't make >any big decisions based on that. My drives are rated at 8 amps and 45 >volts. The mill weighs 3500 pounds so it's not exactly petite. >
And at that input power, they can help heat the shop in this sort of weather. :-) >Gecko's and microstepping is good stuff, but the extra cost is a fair >jump up. I would rather put the money into encoders and a servo system >later. > -- 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) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> Why can't you be a non-conformist like everyone else? ------------------------------------------------------------------------------ Return on Information: Google Enterprise Search pays you back Get the facts. http://p.sf.net/sfu/google-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
