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Callipers and Micrometers – Measurement Good Practice Guide

  



Callipers and Micrometers – Measurement Good Practice Guide

TOC

1 INTRODUCTION
1.1 CALLIPERS AND MICROMETERS
1.2 UNITS OF MEASUREMENT

2 CALLIPERS
2.1 OPERATING PRINCIPLES
2.1.1 Introduction
2.1.2 Types of Vernier Callipers
2.1.3 Standard Vernier Calliper
2.1.4 Dial Calliper
2.1.5 Electronic Calliper
2.1.6 Special purpose callipers
2.2 FACTORS AFFECTING PERFORMANCE
2.2.1 Instrumental error of outside measurement
2.2.2 Instrumental error of inside measurement
2.2.3 Straightness of inside and outside measuring faces
2.3 SET-UP, PREPARATION AND MEASUREMENTS
2.3.1 Set-up and preparation
2.3.2 Measurements
2.4 WORKED EXAMPLES
2.5 SOURCES OF MEASUREMENT UNCERTAINTIES AND ERROR
2.5.1 Calliper construction errors
2.5.2 Parallax error
2.5.3 Environmental conditions and measuring force
2.5.4 Overall errors of callipers
2.5.5 Uncertainties
2.6 HANDLING AND STORAGE OF CALLIPERS
2.6.1 Purchasing callipers
2.6.2 Storage of callipers
2.6.3 Periodic inspection and calibration

3 MICROMETERS
3.1 OPERATING PRINCIPLES
3.1.1 Constant force device
3.1.2 Types of Micrometer
3.1.3 Digital Micrometers
3.2 FACTORS AFFECTING PERFORMANCE
3.3 SET-UP AND PREPARATION
3.4 WORKED EXAMPLES
3.4.1 Standard micrometer (0.01 mm discrimination)
3.4.2 Micrometers with a 0.001 mm discrimination
3.4.3 Reading an imperial (inch) micrometer
3.5 AWARENESS OF UNCERTAINTIES
3.5.1 Introduction
3.5.2 Terminology
3.5.3 Micrometers
3.5.4 Example Uncertainty Budget for the calibration of a 0 – 25 mm Micrometer
3.6 HANDLING AND STORAGE OF MICROMETERS
3.6.1 Routine checks of micrometers
3.6.2 Maintenance of Micrometers
3.6.3 Daily inspection
3.6.4 Cleaning and rust prevention
3.6.5 Storage of micrometers
3.6.6 Maintenance and Periodic Inspection of Micrometers
3.6.7 Special care in using and storing electronic micrometers
3.7 OTHER MICROMETERS
3.7.1 Tubular Inside Micrometer
3.7.2 Calliper type inside micrometer
3.7.3 Three point type inside micrometer
3.7.4 The Depth Micrometer

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