This library consists of four lessons. The lessons in this library were designed for employees in all disciplines as well as for the multi-craft training needs of process and manufacturing facilities. This library describes the purpose and the basic components of some common precision measuring instruments.

Dial Calipers


Micrometers


Telescoping and Thickness Gauges


Dial Indicators

• Identify the beam, dial, and nibs of a dial caliper.
• Explain how to read a dial caliper.
• Zero a dial caliper.
• Explain the use of the two sets of nibs on a dial caliper.
• Obtain the inside measurement of an object by using a dial caliper.
• Obtain the outside measurement of an object by using a dial caliper.

• Identify the main components of an outside, inside, and depth micrometer.
• Explain how to read a micrometer.
• Measure outside dimension using an outside micrometer.
• Measure inside dimension using an inside micrometer.
• Measure depth by using a depth micrometer.

• Measure the inside diameter of an object by using a telescoping gauge in conjunction with an outside micrometer.
• Demonstrate the proper way to insert and remove a telescoping gauge.
• Measure a clearance with a thickness gauge.
• Explain how to double-check your measurements.

• List some of the common uses of a dial indicator.
• Explain how a dial indicator works.
• Explain how to determine if a reading is positive or negative.
• Describe the procedure for determining if a dial indicator is positioned properly.
• Describe how to determine if the dial indicator is secure.
• Measure small changes in dimension by using a dial indicator.
• Define "runout".
• Record and calculate runout.