but what I need to know is if I need to supply 1 amp to these motors or 1.5 amps to this motor
thus my reading will be 0.4v or 0.6v when tuned appropriatly.
Source;(http://reprap.org/wiki/Pololu_stepper_driver_board)
I have used this procedure for tuning the trim pots. Make sure to use a nonconductive screwdriver to adjust. Using a metallic screwdriver can potentially short and damage the Pololu stepper driver. Gently turn the pot counter-clockwise to reduce the amount of current to it’s minimum level. Slowly and gently turn the pot clockwise while using the movement controls in Pronterface to move that axis. Once the axis has smooth movement and travel check the stepper motor for excessive heat. It is OK if the stepper motor gets warm. If the motor is excessively hot you will need to turn the pot counter-clockwise to slightly lessen the the current. If the stepper motor makes a loud sound when moving adjust the stepper motor pot to provide slightly less or slightly more current.
Here in the shop we tune our pololus (connected to Lulzbot steppers) to .375-4V for the X, Y and extruder, and the Z to .4-.425V. This gives the steppers plenty of torque (especially with 16 tooth pulleys) and prevents the pololu and stepper motor form overheating.
If you really need the extra torque, you’ll most likely need to add heat sinks to the IC on the pololu to keep them from overheating