I'm back in town and my first two stepper motors have arrived. Plan is to hook them up and determine if they have a chance in meeting my needs. First step is to test them unloaded. Then to re-test them loaded with approximated inertial loads.

Here's the motors:

Bipolar 12-24V 1.2A 0.9deg 3.0ohm 2.2mH Nema 17 Stepper with 15.6oz.in holding torque.

Bipolar 3.8V 0.67A 1.8deg Nema 11 Stepper with 8.3oz.in holding torque.

Accuracy Testing plans:

1) With "second hand" attached to shaft run motor 1 continuous cycle and measure offset (if possible). Run 1000 continuous rotations and check degrees offset from starting position to determine average error = offset / 1000.

1a) full step 1b) half step 1c) quarter step 1d) eighth step

2) With "second hand" attached to shaft run motor from starting position 0 degrees to 320 degrees (relative), stop, and reverse direction return to 0 degrees. Perform one time for measurements. Perform 1000 times in order to get average error.

2a) full step 2b) half step 2c) quarter step 2d) eighth step

3) Repeat steps 1 and 2 with an inertial load attached.

Timing Testing plans:

1) Run loaded motor in continuous rotation for 100 cycles with timer and measure time to complete. Calculate average time per rotation.

2) Run loaded motor from 0 to 300 and back for 100 cycles....etc.