Intro to Millwright Practice Exam

Which of the following tools is used to find the center of a round object?

1. Center Head

2. Caliper

3. Micrometer

4. Radius Gauge

The correct answer is: Center Head

The center head is specifically designed for locating the center of round objects, such as circles or cylindrical shapes. It typically features a pointed end that can be placed on the perimeter of the object, allowing the user to draw two intersecting lines across the diameter. Where these lines intersect is the center of the round object. This tool is essential in millwright and machining work when precise centering is necessary for drilling, cutting, or other operations. In contrast, a caliper is primarily used for measuring the distance between two opposite sides of an object but does not locate the center directly. A micrometer is a precision instrument used to measure small dimensions with high accuracy, but it also does not serve the purpose of finding the center of a round object. Meanwhile, a radius gauge is used to measure and check the radius of curves or the radii of round objects but does not provide a means to locate the center point. Thus, the center head is the tool best suited for this specific task of finding the center of a round object.