Intro to Millwright Practice Exam

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What is sag in relation to a dial indicator?

The bending of the indicator
The downward distortion of the reading
The lifting of the dial
The tilting of the base

The correct answer is: The downward distortion of the reading

Sag in relation to a dial indicator refers to the downward distortion of the reading that occurs when the indicator’s plunger is subject to its own weight, particularly when it is extended out a distance from its supporting base. This phenomenon can lead to inaccurate measurements because the indicator may not be measuring the intended distance correctly due to the force of gravity acting on the plunger. When measuring with a dial indicator, it is crucial to understand and account for sag, especially in applications where precision is vital. Operators might need to ensure that the dial indicator is positioned in a way that minimizes sag or apply compensating techniques to obtain accurate readings under different conditions. Understanding the concept of sag helps ensure that measurements are both reliable and reflective of the actual parameters being assessed.