On Saturday, July 30, 2011 11:20:01 PM R. van Twisk did opine: > Gene, > > I am pretty sure they have a 4A and a higher version of it, not > only 2amp at 40VDC.... > > I never used them myself, but I here they where cheap and pretty > reliable. This guy didn't put them on his 34HS9802 (Nema 42), but in a > box with some additional cooling. > As was my 4 axis xylotex, in a box that exactly fit a pair of ball bearing psu fans, one in each end, one sucking in and one blowing out the other end. With 19 volts on those fans, they fairly screamed, so the xylotex was probably getting 4 or 5x its recommended airflow. And the fans were still screaming when I heard the pops of the A-3977's blowing their heat sinks off in response to my tapping the -> arrow key on the keyboard.
That is 3 times now for the A-3977, next... > Ries > > On Jul 30, 2011, at 6:15 PM, gene heskett wrote: > > On Saturday, July 30, 2011 06:41:18 PM R. van Twisk did opine: > >> Gene, > >> > >> I don't have experience with the G540, I am using the Vampire series > >> which are a great set of drivers but they are not faultless!! But > >> there return and support on broken drivers are very good. > >> > >> I did hear some good news from the UIM 2400xx series www.uirobot.com > >> I know a couple of guys using them on there mechmates without issues. > >> > >> Ries > > > > That looks like a backwards step, only 2 amps, generally designed for > > nema 17 motors I assume. > > > > I just found this one, doesn't look too bad. > > > > <http://cgi.ebay.com/4-2A-2M542-CNC-Stepper-Motor-Driver-controller-24 > > V-48V-/120755603538?pt=LH_DefaultDomain_0&hash=item1c1d984852> > > > > Upto 64 microsteps, current turndown when quiet. I am tempted to > > order 5 so I have a spare, at 10 bucks more than the G540. 4.2 amps, > > 48 volt maximum. > > > > And I just did, but it will be about 2 weeks free delivery from China. > > > > Or, speak of el-cheapo, 70 bucks for what looks like that's about what > > its worth: > > > > <http://cgi.ebay.com/4-Axis-TB6560-CNC-Stepper-Motor-Driver-Controller > > -Board-/130532324742?pt=LH_DefaultDomain_0&hash=item1e64553586> > > > > Nice fan cooled heat sink, but that chip doesn't impress me too much. > > And its not a step up, 3 amps 36 volts, about the same as the Allegro > > A3977 but all 4 in one package. The 2M542 is a step up, allowing me > > to raise the motor voltage if I am so inclined. > > > > Cheers, gene > > ------------------------------------------------------------------------ > ------ Got Input? Slashdot Needs You. > Take our quick survey online. Come on, we don't ask for help often. > Plus, you'll get a chance to win $100 to spend on ThinkGeek. > http://p.sf.net/sfu/slashdot-survey > _______________________________________________ > 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) You scratch my tape, and I'll scratch yours. ------------------------------------------------------------------------------ Got Input? Slashdot Needs You. Take our quick survey online. Come on, we don't ask for help often. Plus, you'll get a chance to win $100 to spend on ThinkGeek. http://p.sf.net/sfu/slashdot-survey _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
