On Thu, 2008-04-17 at 19:35 -0400, John Kasunich wrote: ... snip > If you > have a bench power supply with constant current mode, put a known > current (an amp or so) through a winding and measure the voltage drop. > Ohms law gives you the resistance, and as long as you make the voltage > measurements right at the motor terminals lead resistance doesn't matter. > > One other note - tell us if you are measuring from one end to the other, > or from one end to the center tap. ... snip I setup a 1.2 Ohm resistor in series with a winding (c tap to end). Then dialed the supply to get 1.2 Volts across the resistor to get 1 Amp. I measured the voltage across the winding and got .24 Volts or .24 Ohms. Then across two ends and got .47 Volts or .47 Ohms. This was a fun experiment. I wonder how valid it is.
> Is the pot turned all the way up? The motor might be 4 or 6 or 7A. The pot Ohms out close to the middle, but I don't know what that means. ... snip I think Jon may have figured out that the inhibit functions as a transition between half and full stepping. Currently, with type 8 full steps I get .001" increments, but I had at least .0005" before. The machine shudders at low speed now. I am going to try half stepping to see what happens. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending Craftsman AA 109 restoration Shizuoka ST-N/Bandit CNC) ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
