Hi, Dave
Torque, Accuracy, Speed, Trade Offs.
If you use a 200 step stepper direct, It's 1.8 deg. per step Accuracy, If it's 10 Micro-step, It's 0.18 deg. per step Accuracy.
Depending on the material your cutting, Holding or Moving Torque could be an Issue.
Most rotary tables are 72 to 1, (72 turns to 1 table turn), Have a Sherline Hear.
Steps-Turns-Accuracy & Reduction Values to consider.
Steps 200 X 72 = 14400 steps, 0.025 deg Accuracy. (Sherline/Rot. Table Type)
Steps 200 X 7.2 (10\72 reduction) = 1440 steps, 0.25 deg Accuracy. (Belt/Geared/Stepper)
Steps 200 X 3.6 (20\72 reduction) = 720 steps, 0.5 deg Accuracy. (Belt/Geared/Stepper)
Micro-Steps 2000 X 72 = 144,000 steps, 0.0025 deg Accuracy. (Sherline/Rot. Table Type)
Micro-Steps 2000 X 7.2 (10\72 reduction) = 14,400 steps, 0.025 deg Accuracy. (Belt/Geared/Stepper)
Micro-Steps 2000 X 3.6 (20\72 reduction) = 14,400 steps, 0.05 deg Accuracy. (Belt/Geared/Stepper)
Hope this Helps, Chip