On Sunday, July 25, 2010 09:13:17 am Cathrine Hribar did opine: > On Sat, 24 Jul 2010 23:18:28 -0400 > Gene Heskett <gene.hesk...@gmail.com> > > > Hi Gene: > > Thanks for explaining the diff. between those DC brushed motors. I > understand most of what u wrote. > > One more question, if u will. > > Is a stepper motor as powerful as a servo if voltage & amp draw are the > same? > Now that is a question I'll let others more experienced expound on at greater length than I would feel qualified to.
>From my hobby shop perspective, and stepper only experience, it seems to me the low speed stepper is a hard act to follow. As long as it stays in step, you will be where you told it to go within the resolution of the motor/microstepper accuracy limits. However, where time=money, the higher speed abilities of a well tuned servo will pay the bills in two ways. 1. You can apply the usual recipes to cutting depth and speed for optimum tool life, speeds which are often beyond the speed/torque ability of the stepper, or the spindle power of a small mill. That is both more parts/day and reduced cost in tooling right there. Miss-used of course you can break tooling at a higher rate. 2. Because the servo's can often hit rapids that are several times faster, again that is time saved and more parts in the output bin a day & that = more profit. But that would be about as far as I can go since I don't have any servo's at all on my micromill and therefore no real world experience to draw from. My micromill doesn't look much like what Harbor Freight sent me though, I have the LMS big tables kit on it, and I threw away the Z drive and started over. I can now put 155 lbs of push on a drill bit, whereas the OEM Z drive bound the head to the post at about 5 lbs. There are some pix at: <http://gene.homelinux.net:85/gene/> Click the 'emc' link about halfway down the page. > Thanks again > > Bill > > >> > 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) > >> > All men profess honesty as long as they can. To believe all men > >> > honest would be folly. To believe none so is something worse. > >> > > >> > -- John Quincy Adams > >> > > >> > ------------------------------------------------------------------- > >> > --- -------- This SF.net email is sponsored by Sprint > >> > What will you do first with EVO, the first 4G phone? > >> > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > >> > _______________________________________________ > >> > Emc-users mailing list > >> > Emc-users@lists.sourceforge.net > >> > https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> --------------------------------------------------------------------- > >> --- ------ This SF.net email is sponsored by Sprint > >> What will you do first with EVO, the first 4G phone? > >> Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------ > ------ This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > 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) At the end of your life there'll be a good rest, and no further activities are scheduled. ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
