PRESENTATION ON INSPECTION QUALITY CONTROL INTRODUCTION TO IQC

introduction Inspection is the art of comparing material, product or performance with established standards.

PHYSICAL QUANTITY All quantity in terms of which laws of physics can be expressed and which can be measured directly or indirectly are called physical quantity.

MEASURMENT Measurement is the presses of comparison of an unknown quantity with a known fixed unit quantity of the similar nature.

Properties of measurement It should be easy to reproduce. It should be easily accessible. It should be commonly acceptable. It should not change with time and from place to place. It should be well defined.

BASIC METHOD OF MEASURMENT These are two types of basic method of measurment:- Direct comparison Indirect comparison

CLASSIFICATION OF UNITS FUNDAMENTAL UNITS DERIVED UNITS

SYSTEM OF UNITS C.G.S. SYSTEM F.P.S. SYSTEM M.K.S. SYSTEM S.I. UNITS

C. G. S. SYSTEM:-It is also known as “French system” C.G.S. SYSTEM:-It is also known as “French system”. In this system the unit of length in centimeter, unit of mass is gram and unit of time is second. F.P.S. SYSTEM:-It is also known as “British system”. It uses foot, pound and second.

M. K. S. SYSTEM:-It is also known as “Metric system” M.K.S. SYSTEM:-It is also known as “Metric system”.it is a system of measurement in which the fundamental units of measurement of length, mass, and time are meter, kilogram and second respectively. S.I. UNITS:-French name of this system is “System international” units, abbreviated as s.i. unit. This system is an Improved and extended version of M.K.S. system of unit.

Standard for measurment Primary standred- Primary standred are absolute standerds of high accuracy that are used as refrence standred. Secondary standred- Secondary standred are close copies of primary standred and are used in industries for measurment.

Tertiary standred- These are used for refrence purpose in laboratories and workshop. Working standred- Working standred are used as major tools of measurment in ameasurment laboraratory.

INTERCHANGEBILITY Interchangebility refers to assembling a number of mating component taken at random from stock, so as to build up a complete assembly without fitting or adjustment. Types of interchangebility:- Full or universal interchangeability Selective assembly Matched fits

INTERNATIONAL OR NATIONAL STANDRED International standred- The international standred are defined on the basic of international agreement.The international standred are maintained at the international Bureau of weight and international organizatin for standred.(ISO)

NATIONAL STANDRED- The Bureau of indian standred(BIS)is on the same pattern as british standred institution(BSI).Its principal object are: To use for the improvment. To set up standred of quality and dimension. To samplify production and distrbution.

STANDRED OF MEASURMENT These days two standerd system of linear measurement ,English(yard) and metric(meter) are in general use throughout the world. For linear measurement the various standerd known are:- Line standred End standred Wave length standred

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