On Sun, 4 Jan 2009 17:32:42 +0000 (UTC), you wrote:
>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. A couple of things to bear in mind with big steppers is their performance. Some leave a lot to be desired at anything above low rpm, and some also have a nasty habit of loosing steps on direction reversal unless the driver/controller are well set up. They can be "coggy" and often a smaller stepper with larger belt reduction will outperform them. It can be trial and error to find a good reliable combination and the "manufacturers data" on some oriental motors can't be relied upon, it can only be described as a work of fiction ;) Steve Blackmore -- ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
