Prepare for the Millwright Level 1 Exam with multiple choice questions and detailed explanations. This quiz will guide you through essential topics, helping you master the skills needed to succeed in the millwright profession.

Practice this question and more.


What mechanism does a dial caliper use to move its pointer?

  1. Hydraulic system

  2. Gear system

  3. Pneumatic system

  4. Rack and pinion

The correct answer is: Rack and pinion

A dial caliper utilizes a rack and pinion mechanism to move its pointer. In this design, the rack consists of teeth cut into a flat bar, while the pinion is a small gear that meshes with these teeth. When the caliper is adjusted, the movement of the caliper's arms causes the pinion to rotate. This rotation moves the pointer along the dial face, translating the linear motion of the measuring jaws into the circular motion observed on the dial. This mechanism allows for precise and smooth movement of the indicator, providing accurate readings of the measurement taken. The rack and pinion system is favored in this application due to its reliability and effectiveness in converting linear motion into rotational movement, essential for accurate readings in precision measuring tools like a dial caliper. Other mechanisms, such as hydraulic, pneumatic, or gear systems, do not offer the same level of direct measurement conversion needed for this type of tool.