Precision Measuring Instruments

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

Description: This is the first lesson in the iKNOW™ Precision Measuring Instruments Library. This lesson describes the purpose and the basic components of dial calipers. The lesson also provides procedures for properly using a dial caliper to measure the dimensions of an object.

Prerequisites: None

Topics:

Preparing to Use a Dial Caliper

Measurements

Objectives:

• 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

Micrometers

Description: This is the second lesson in the iKNOW™ Precision Measuring Instruments Library. This lesson describes the purpose and the basic components of outside micrometers, inside micrometers, and depth micrometers. The lesson also provides procedures for properly using each of these instruments to measure the dimensions of an object.

Prerequisites: None

Topics:

Outside Micrometers

Inside Micrometers

Depth Micrometers

Objectives:

• 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

Telescoping and Thickness Gauges

Description: This is the third lesson in the iKNOW™ Precision Measuring Instruments Library. This lesson describes the purpose and the basic components of telescoping gauges and thickness gauges. The lesson also provides procedures for properly using each of these instruments to measure the dimensions of an object.

Prerequisites: Knowledge of how to take a reading with an outside micrometer is required.

Prerequisites: Knowledge of how to take a reading with an outside micrometer is required.

Topics:

Using a Telescoping Gauge

Using a Thickness Gauge

Measuring Clearance

Objectives:

• 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

Dial Indicators

Description: This is the final lesson in the iKNOW™ Precision Measuring Instruments Library. This lesson describes the purpose and the basic components of dial indicators. The lesson also provides procedures for properly using dial indicators to measure the dimensions of an object.

Prerequisites: None

Topics:

Indicator Setup

Using a Dial Indicator

Objectives:

• 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