i have a 3 axis mill with Sanyo Denki 103-845-6741 steppers. the labels read: 12-300volts 6.7 amp nema 34. holding torque 486 ounce inches. rotor inertia=21.5 oz/inch .winding inductance=2 mh. I am also using gecko g201s with the current set resistor at 270k or 7 amps. The power supply is running at 40 v @5 amps. I am also using turbocnc v4. The problem is i have no torque, or more correctly i am missing steps like mad. And one of the motors is singing like mad. I find the quotation 12-300 volts on the label to be pretty strange. Thats a huge range. Does anyone know what would be a correct current range for these motors? Also do you think the singing , low torque and missing steps are related? DUH!! i would assume thats a given. One last thing...I have been running it from windows as i havent been able to get it to run from DOS. I know thats alot of suspect variables but i am pulling my hair out trying to get this thing running. MARISS!!! Are you out there!!?