Also note that most stepper motors are rated in RMS and the drivers i have come across are rated in peak, so if the driver says 3 A the drive will most likely only give 2.12A RMS, so you need to look for a motor that is 2A RMS and normally that is in series, so you need to remember that if you want to connect in parallel you will need 4.2 A RMS (5.93A Peak)
Originally Posted by
rippersoft
You are not limited to 200 oz with the HobbyCNC board. You are limited to 3amps per phase and I believe 42 volts. Ideally run the board at 32VDC. Find 6 or 8 wire steppers rated at 3amps or less and they will work just fine.
I use Keling Inc steppers which are rated at 250 oz or so. They work great and have plenty of torque. There are higher torque steppers available within the 3 amp range.
There are other manufactures that produce high torque and low current demand steppers.
RipperSoftware
Motion Control Products Ltd
www.motioncontrolproducts.co.uk