I have a 12V/350mA bipolar stepper motor from Adafruit: http://www.adafruit.com/products/324
I have a Arduino motor shield attached on top of the Arduino; this motor shield uses the LM298 driver, which can output 2A max per channel, according to data sheet. However, due to the huge mass (20 in Al motor shaft + attached PCBs; very heavy stuff) on top of the motor shaft, the motor is no longer turning, and I have to slowly push it w/ my hand to get it to turn step by step. My power supply (from Agilent) is 24V/0.5A. Do I need a larger power supply? All I'm doing is trying to make motor spin back+forth using the Stepper.h library. How do I make this motor turn? Do I need a motor w/ a higher current rating (up to 2A)?
Edit: I have 1 more question-- is there any way to adjust the acceleration of the bipolar stepper motor on the Arduino code? I know I can adjust speed using "myStepper.setSpeed(200)", where 200 = 200 rpm.