What is the difference between Key Shaft and Milling Shaft in motors?

Video thumbnail for E181 Control Position and  Speed of Stepper motor with L298N module using Arduino RJT181

What is the difference between Key Shaft and Milling Shaft in motors?

This article shows the difference between key shaft and milling shaft in stepper and DC motors

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What is the difference between Key Shaft and Milling Shaft in motors?

What is the difference betweek Key Sharf and Milling Shaft in motors

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