On Sunday, July 31, 2011 10:33:02 AM Mark Wendt (Contractor) did opine: > On 7/30/2011 7:15 PM, gene heskett wrote: > > 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 > > Gene, > > Stay as far away as possible from the TB6560-chipped board. Users > on CNCZone have reported nothing but problems with it, and are doing all > sorts of mods to the board just to get it minimally work. > > Mark
This one I have ordered doesn't state the chip used, but its specs exceed the TB6560 by enough it can't be that one. IMO the allegro A-3977 kicks it out of the ring. It Just Works(TM) for as long as it works. I of course will do a blow by blow on bringing them up when they arrive. More concerned with the drive the opto's need, so I may have to build a row of booster transistors on a perfboard. The chip on that extra parport card from startech doesn't look like it could sink 15 ma per line, very small TSOP with no heat sink. Since the existing cable from the pc's parport connects to the xylotex via a 26 pin dual row IDC connector, perhaps someone here has a BOB that would simplify this by allowing that cable to be reused? I'll do some googling for parport b.o.b.'s. At the cnc4pc site, can I get away with just the M34-M35 kit to replace the xylotex built in bob, /and/ get the boost for the opto drive?. It looks like a 2" 40 pin IDC jumper is all that would need to connect them, and that is only as far away as my vice. From there I am in euro style connectors which I have grown to like. Or is there some other kit I would be better off using, bearing in mind the b.o.b. on the xylotex is 100% passive, so all I have to do is connect the buffered signals 1 to 1 to restore my spindle controls. As a side comment, I would like to be able to control the aux spindle I put on it this spring, with a speed controller as stiff as the OEM controller in the original micro mill, but for that die grinder I'd need nearly a kilowatt. Even with my beefed up HEXFET in that device, I have serious doubts it would survive the 6 or 7 running amps that die grinder needs, so more than likely just an extra relay to switch the PWM to run a std power relay is the best I can do, or afford unless someone is aware of a speed controller that works reliably with that type of motor. I have one of those $30 controllers on a dewalt 792 router, and its performance leaves _much_ to be desired. No 'stiffness' to the control at all, seemingly idling at 2 grand or once it hits 3g's, boom its up to 20g's. Yeah, I know, a lot of questions in one msg... Thanks. 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) * Knghtbrd crosses his toes <Knghtbrd> (if I crossed my fingers it would be hard to type) ------------------------------------------------------------------------------ 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
