CNC Cutting Machine Practice Test

How does the closed loop indirect feedback method work?

1. By measuring slide ways with a laser

2. By measuring lead screw reactions using a rotary encoder

3. By tracking tool wear

4. By utilizing temperature sensors

The correct answer is: By measuring lead screw reactions using a rotary encoder

The closed-loop indirect feedback method operates by measuring lead screw reactions using a rotary encoder. This process involves placing an encoder on the lead screw, which converts its rotational position into an electrical signal. This signal is then fed back to the control system, allowing for precise adjustments in the machine’s movement. This method enhances the accuracy of the CNC cutting machine by continuously monitoring the actual position of the machine’s components relative to the commanded position. In doing so, any discrepancies are detected, and necessary corrections can be made, ensuring that the CNC machine operates within the specified tolerances. By using lead screw reactions, the closed-loop system effectively captures real-time feedback, facilitating more reliable and consistent cutting operations. Other methods, such as measuring slide ways with a laser, tracking tool wear, or utilizing temperature sensors, serve different purposes in CNC operations but do not specifically relate to the feedback mechanisms used in closed-loop systems. For instance, laser measurements are often used for alignment or calibration rather than direct feedback in motion control, and tracking tool wear or temperature changes pertains more to monitoring and maintenance rather than immediate positional feedback.