On Wednesday 26 March 2008, John Thornton wrote: >Ok, I don't have stacks of old 5 1/4 floppy drives laying around... > >When it comes to electronics I need all the help I can get. So the MPG puts > out 4 pairs of signals and the LM399 converts that to 4 outputs? Lots of I don't know about MPG. The motor puts out 2 pairs of signals from its windings, but each pair can be reduced to one as a logic level by one of the 4 comparators in an LM339? so that only 2 inputs are needed by emc per axis controlled.
> googling going on... and EMC needs? I'm just looking at a MPG spec sheet > and they only have 6 connections so I assume one is ground, one is power in > and the other 4 are the signal coming out. Now I'm really confused. The > LM399 has 8 inputs and 4 outputs. > The lm399 would in this case have enough units in it to convert the 4 wires from 2 motors (say one was x, the other y, whatever) into the pair of quadrature signals emc would need per axis serviced. That would be 8 signals plus power abd ground, and 4 motors and two LM399's and a handfull of 1/4 watt resistors & small signal diodes for a complete 4 axis setup. Not sure if I have 4 of those motors though, I'd have to rummage in the basement & check. I have the extra parport card installed already so thats not a problem. I'm not fam enough with the MPG though, and would have to assume it might contain a switch that could be used to tell emc which channel/axis it represents at the moment, otherwise I'm not sure what the other 2 wires would be. >Can you explain just a bit more for me please. > >Thanks >John > >On 25 Mar 2008 at 11:43, Gene Heskett wrote: >> On Tuesday 25 March 2008, John Thornton wrote: >> >Why not just use a MPG their only $69? >> >> cuz we've already got stacks of the old floppy drives? And either >> will need an interface to shrink it down to a quadrature pair. An >> lm-339 makes that very easy. Needs ground, 5 volts, outputs the >> quadrature pair, 4 wires total in the cable. >> >> -- >> 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) >> AWAKE! FEAR! FIRE! FOES! AWAKE! >> FEAR! FIRE! FOES! >> AWAKE! AWAKE! >> -- J. R. R. Tolkien >> >> ---------------------------------------------------------------------- >> --- This SF.net email is sponsored by: Microsoft Defy all challenges. >> Microsoft(R) Visual Studio 2008. >> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ >> _______________________________________________ Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > >------------------------------------------------------------------------- >Check out the new SourceForge.net Marketplace. >It's the best place to buy or sell services for >just about anything Open Source. >http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace >_______________________________________________ >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) Some people carve careers, others chisel them. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
