What is the definition of dial indicator sag?

• A. The total movement of a dial indicator during alignment
• B. False readings due to gravity effects on the indicator
• C. The amount by which the dial is out of alignment
• D. Measured distance between two fixed points

Answer: (B)

Dial indicator sag refers to the phenomenon where gravity causes the dial indicator to display inaccurate readings when it is not positioned properly. This sag can result in false readings, as the indicator's needle may deviate from the actual alignment measurement due to the weight of the indicator or how it is mounted. Understanding this concept is crucial during alignment procedures because it highlights the importance of keeping the dial indicator level and properly supported to ensure accurate measurements are obtained. Such attention to detail helps prevent errors in alignment tasks, maintaining machinery at optimal operational efficiency.