CNC Cutting Machine Practice Test

What is one disadvantage of closed loop indirect feedback systems?

1. They require expensive components

2. They cannot detect torque effects or gear backlash

3. They cannot operate without skilled personnel

4. They are slower than direct systems

The correct answer is: They cannot detect torque effects or gear backlash

The selection of the option regarding the inability of closed loop indirect feedback systems to detect torque effects or gear backlash is accurate. In closed loop systems, feedback is essential to ensure that the system operates accurately and responsively. However, in an indirect feedback system, the measurements taken may not directly reflect the actual output state of the system. This means that factors such as torque effects, which relate to how much force the motor can apply, and gear backlash, a phenomenon where there is a slight delay in movement due to the play between gears, might not be adequately captured. This limitation can lead to issues in precision and performance, particularly in applications where exact positioning and consistent torque are necessary. Indirect methods often rely on parameters that are not directly tied to the actual operational conditions, which can lead to inaccuracies and reduced effectiveness of the system in dealing with dynamics that can affect movement and operation. Thus, the inability to detect these mechanical nuances exemplifies a key disadvantage of closed loop indirect feedback systems.