Answer :
Final answer:
A dial indicator is primarily used to measure the runout of a rotor, which detects deviations from a true circular path during rotation. Other options, such as measuring thickness or hotspot detection, are not the main applications for this tool. Employing a dial indicator helps ensure that rotors function efficiently and effectively.
Explanation:
Understanding Dial Indicators
A dial indicator is an instrument used to measure the displacement of an object, specifically in machining and mechanical engineering contexts. It is especially useful for checking the runout of rotors, which refers to the amount of deviation from a true circular path in the rotor's rotation.
Measurement Options with Dial Indicators
- Thickness: While dial indicators can measure thickness, this is not their primary application when evaluating rotors.
- Runout: This is the most common use for dial indicators in relation to rotors. By placing the tip of the dial indicator on the rotor's surface, the operator can rotate the rotor and observe variations, indicating any misalignment or imbalance.
- Hot spots: Dial indicators are not typically used for measuring hot spots, which usually require thermal imaging or other methods.
- Groove wear: Although dial indicators can measure wear, they are not the best tool for assessing groove wear specifically.
In summary, a dial indicator is most effectively employed for measuring the runout of a rotor, enabling engineers to ensure proper functioning and alignment.
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