CNC Cutting Machine Practice Test

What does the 'step angle' of a screw refer to?

1. The total distance a screw can travel in one rotation

2. The smallest rotation increment of a screw

3. The total torque applied to the screw

4. The friction caused by the screw's operation

The correct answer is: The smallest rotation increment of a screw

The concept of 'step angle' in relation to a screw is fundamentally about the precise control of motion in incremental units. Specifically, the step angle indicates the smallest angular movement the screw can make with each step of rotation. This is particularly important in applications like CNC cutting machines, where precise positioning and movement are crucial for ensuring accuracy in cutting processes. Understanding the step angle is essential for determining how finely a machine can maneuver and position itself, directly impacting the quality of the cut or the operation being performed. The smaller the step angle, the more precise the movements can be, allowing for detailed work and adjustments. In contrast to the alternatives, the total distance a screw can travel in one rotation is related to its lead, which factors into how steps translate into linear motion but does not define incremental movement. The total torque applied to a screw refers to the force being exerted when turning the screw, while friction pertains to resistance encountered during operation, neither of which define the specific movement capabilities of the screw in terms of rotation increments.