On Sunday 04 January 2009, Roger wrote: >Gene Heskett <gene.hesk...@...> writes: > >Snip > >> So have I, but something like that is the exception to the rule. The >> motors torque was exceeded, yes, but it wasn't moving that fast so it >> could keep on running. To me that would be a sign telling me I needed >> bigger motors and drivers. While a bridgeport can be moved with small >> motors like I use, when handling the size of a bridgeport tables weight, >> I'd want nema 34 motors and 80 volt drives as absolute minimums. My x >> table only weighs maybe 20 pounds, the bridgepoort closer to 200. > >Gene, >What I was thinking about was using steppers to reliably power big iron on > the Bridgeport scale. Kelinginc.net sells big steppers (nema 34, 1800 oz) > for $180. If you add an encoder and a G203V 80 volt/20 amp drive you are > under $400 per axis. > Which, if one can afford the bridgeport, is very attractive. But I'd have to have a good prospect of actually putting it to work before I could even think about justifying that expense. That means going back to time clocks to cost expenses and I haven't had to punch a clock in nearly 40 years.
>That is a pretty attractive price and makes retrofitting old Faunic based >machines with their screwy AMP's with resolver feedback instead of tachs a >whole lot more reasonable. A stepper based conversion would not have the >performance of a servo system but could still be useful in a home shop. > >I don't have a machine in mind... just thinking. Likewise. :) >Roger > Thanks Roger. -- 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) t's an ID-10-T error ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
