EM

 
Metrology Complete Book as per JNTUH


Engineering Metrology is a branch of science which deals with Measurements.
These measurements may be either Precision, accurate Lengths, weights, quantities etc.,

Especially for Mechanical Engineers, in order to produce a compound/product with accurate dimensions., it is necessary to design a Machine Tool with perfect dimensions. we learn such things in Engineering Metrology.

For example., 
considering our mobiles,
ᔓTheir screens are of Standard Dimensions
ᔓTheir internal components are arranged as precision arrangement.
CNC Lathe performs better accuracy than manual Lathe.

Units

1.System of Limits & Fits

Normal Size
Tolerance
Limits
Deviations
Allowances
Fits & their Types
Unilateral & Bilateral Tolerance System
Hole & Shaft basis System
InterChangeability  & Selective assembly

2.Linear Measurement

Line & End standards
Slip Gauges
Calibration of Slip gauges
Dial Indicator
Micrometer

Measurement of Angles & Tapers

Different methods of Angle Measurement
Bevel Protractor 
Angle Slip Gauges
Spirit level
Sine bar
Sine plate used to determine tapers

Limit Gauges

Taylor's Principle
Design of Go & No-Go gauges
Plug, Ring, Snap, Taper, Profile & Position Gauges

3.Optical Measuring Instruments

Tool Maker's Microscope & its uses
Collimators
Optical Projector
Optical Flat & uses of Interferometer

Flat Surface Measurement

Measurement of Flat Surfaces & instruments used
Straight Edge
Surface plates
Optical Flat & auto collimator

4.Surface Roughness Measurement

Difference b/w Surface Roughness & Surface Waviness
CLA, RMS values
Rz Value & R10 Value