Millwright Level 1 Practice Exam

Which component of the micrometer framework aids in providing measurement readings?

1. The thimble

2. The spindle

3. The anvil

4. The frame

The correct answer is: The thimble

The thimble is a crucial component of the micrometer framework that enables precise measurement readings. It is a cylindrical part that typically features a graduated scale along its outer surface. As the thimble is turned, it moves the spindle towards or away from the anvil, facilitating the measurement of the thickness or diameter of an object. The increments on the thimble, when combined with the scale on the frame, allow for accurate readings down to thousandths of an inch or millimeters, significantly enhancing the tool's accuracy. Other components also play important roles in the overall functionality of the micrometer. The spindle is the part that moves when the thimble is rotated, directly interacting with the material being measured, while the anvil serves as a fixed reference point. The frame provides the structural support necessary to hold all these components in place and maintain alignment but does not have the direct function of providing measurement readings. The thimble, therefore, is essential for determining the precise dimensions of the workpiece.