Page 149 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

EXERCISE 42: Demo on digital indicator& bore gauge and

their application

Objectives

At the end of this exercise you shall be able to
• identify elements of digital indicator and bore gauge
• working of digital indicator and bore gauge
• checking parallelism, flatness, ovaliness, concentricity of job using digital indicator
• checking internal diameter of bore using bore gauge
• precaution while handling of digital indicator and bore gauge.

Procedure

Digital indicators are a modern variation of the classic dial test indicator (DTI) commonly used to measure minute
deviations in alignment, runout, and flatness of machined surfaces.

Digital vs. Dial:
• Traditional DTIs have a circular dial with a needle that shows the movement.

• Digital indicators display the measurement as a numerical value on a screen, making them easier to read and
record.
Advantages of Digital Indicators:
• Improved Readability: The digital display eliminates the possibility of misinterpreting needle positions on a
dial.
• Data Recording: Some models allow data output for easy documentation and analysis.
• Additional Features: Certain digital indicators offer functionalities like tolerance settings, data transfer, and
multiple measurement units.
Uses of Digital indicator
• Checking runout of rotating parts

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