Millwright Level 1 Practice Exam

For maximum reliability when setting dividers to a dimension, where should one point be set on the steel rule?

1. At the midpoint of the measurement

2. At the 1 inch or 10 MM graduation

3. At the zero point of the scale

4. At the last graduation mark

The correct answer is: At the 1 inch or 10 MM graduation

Setting one point of the dividers at a graduation mark that is an even measurement, such as 1 inch or 10 mm, maximizes reliability and accuracy. This is because these marks provide a clear reference point for measurement and reduce the potential for error. When using dividers, the goal is to ensure that you can easily and precisely transfer the measurement onto the material being worked with. By aligning with an identifiable graduation mark, you enhance your ability to consistently replicate measurements without ambiguity, which is crucial for ensuring precision in tasks like layout and setup in fabrication or assembly processes. Other points, such as the midpoint or zero point, may introduce slight inaccuracies based on calibration or reading errors, while the last graduation mark could potentially lead to confusion about the exact dimension if not double-checked. Therefore, using a clear and standard graduation improves the reliability of your measurements in practical applications.