Page 2 - Personal Study Notes (Engineering Metrology - 22342)

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Engineering Metrology (22342)

Unit 1: Introduction to Metrology

Introduction

Metrology word is derived from two Greek words such as metro which means measurement and
logy which means science.

Metrology is a science of measurement.
Metrology may be divided depending upon the quantity under consideration into: metrology of length,
metrology of time etc. Depending upon the field of application it is divided into industrial metrology,
medical metrology etc.
Engineering metrology is restricted to the measurement of length, angles and other quantities which
are expressed in linear or angular terms.
Engineering metrology is the use of measurement science in manufacturing. The study of metrology is
highly valuable for the students and practitioners, specifically from mechanical and allied engineering

stream.
For a product to be successful it needs to be manufactured according to metrological specifications,
otherwise heavy costs are incurred to comply with the specifications in the later stage. Also, the role
played by measurements in the day today life makes it essential to study metrology.
This course is designed to impart the knowledge to develop measurement procedures, conduct
metrological experiments, and obtain and interpret the results. A laboratory demonstration is also
induced to enhance the learning process.
The course would be useful in many areas in the traditional and modern high technology viz.
manufacturing, industrial, scientific research, defense, and many others.

Definition of Metrology

Science of measurement/pure science of measurement.
Engineering metrology (Defn):- Measurement of dimension: length thickness, diameter, taper angle
flatness straightness profiles and others.
Ex: Slideway for machine tool( lathe) it must have specific dimension angle and flatness for its desired
function.
Inspection (Defn):- checking the dimension of other defects of a part which has already being

produced.

Objectives of Metrology

While the basic objective of a measurement is to provide the required accuracy at minimum cost,
metrology would have further objective in a modern engineering plant with different shops like Tool Room,
Machine Shop, Press Shop, Plastic Shop, Pressure Die Casting Shop, Electroplating and Painting Shop,
and Assembly Shop; as also Research, Development and Engineering Department.

In such an engineering organization, the further objectives would be as follows:

Engineering Metrology By-Niraj Mahamure (Only For Personal Use) 1