What must be done to ensure the dials are accurately positioned before measuring?

To ensure accurate positioning of the dials before measuring, it's essential that hold down bolts are evenly torqued. This practice minimizes the risk of introducing errors in the measurements due to any misalignment or movement of the dial gauges. When hold down bolts are evenly torqued, it ensures that the dials remain stable throughout the measurement process, leading to consistent and reliable readings.

Proper torque not only holds the dials firmly in place but also ensures that any potential mechanical flex or distortion that could affect measurements is minimized. This step is critical in achieving precision, as even slight variations in dial positioning can lead to substantial inaccuracies in alignment readings. Thus, ensuring that the hold down bolts are evenly torqued is a foundational practice in accurate alignment measurement in millwright tasks.