On 1/14/2013 7:40 PM, Gene Heskett wrote: > On Monday 14 January 2013 19:27:59 Ed Nisley did opine: > Message additions Copyright Monday 14 January 2013 by Gene Heskett > > >> On 01/11/2013 11:19 PM, Gene Heskett wrote: >> >>> a 6 pack of the $50 2M542's in my stuff >>> >>> Zero problems in a year + so far. >>> >> I wonder whether the 2M542 bricks for sale today bear any resemblance to >> the ones you have: *all* the eBay listings have the same part number and >> description, but different pictures (some of which actually show a "542" >> on the brick). Of course, the pictures rarely correspond to the actual >> item in the shipping box; it's a surprise every time. >> >> But you give me some confidence that they'll be serviceable, >> particularly for the relatively light duty involved in 3D printing: no >> swarf! >> >> I don't know what voltage the M2 motor power sends to the drivers, but >> that's easily swapped out. >> >> It looks like fun... >> > Voltage would be whatever is being fed to the 'bricks' minus 50 milliohms > of on resistance in the H bridge's hexfet outputs. Max volts is 50 for > those, max amps is 4.2, chopper regulated at about 20 kilohertz according > to the noises I see when I wave a scope probe near by. Min current can be > held to an amp or less, don't have the spec sheet in front of me ATM. > > They do run hotter at lower voltages I would note, less than 24 volts isn't > recommended. > > I wasn't convinced either, so I bought a spare, but its still in the box. > If I buy any more, I'd likely buy the 80 volt 7.x amp version as my next > project might be a nema 56 to pull logs thru my big bandsaw. But that is > still in the mental image stage because I'd first have to pour a slab to > support the trackage to carry the log, then wrap a building around it. > > Cheers, Gene >
>>my next project might be a nema 56 to pull logs thru my big bandsaw. But that is still in the mental image stage because I'd first have to pour a slab to support the trackage to carry the log, then wrap a building around it. I'm pretty sure they call that a SawMill ! I had some similar dreams but I haven't gotten around to it yet. I have the space and I have some logs, just short on time. Dave ------------------------------------------------------------------------------ Master Java SE, Java EE, Eclipse, Spring, Hibernate, JavaScript, jQuery and much more. Keep your Java skills current with LearnJavaNow - 200+ hours of step-by-step video tutorials by Java experts. SALE $49.99 this month only -- learn more at: http://p.sf.net/sfu/learnmore_122612 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
