linear measurement Linear Measurement Non Precision Instruments 1

linear measurement

Linear Measurement : Non Precision Instruments 1) Calipers 1) firm joint callipers (Inside & Outside callipers) 2) spring type callipers (Inside & Outside callipers) 3) Odd leg callipers 2) Trammels Preicision callipers 1) Vernier calliper Least Count -0. 02 mm 1) Type A 2) type B 3) type C A) Vernier height gauge B) Vernier depth gauge

2) Micrometers Least Count -0. 01 1)Outsdie Mircometer 2)Inside Micrometer 3)Depth micrometer 4)Bench Micrometer 5)Digital micrometer 6)Micrometer with Dial gauge 7)Screw thead micrometer

Bore guage 1) Dial Bore gauge 2) Hemipherical bore gauge Telescopic gauge Slip Gauge Limit gauge 1) Plug gauge 2) Progressive Plug gauge 3) Ring gauge 4) Snap gauge 5) Progressive snap gauge

Calibration of linear measurement 1)Calibration of vernier calliper A)Hardness Test on working faces B) Flatness and squareness of beam C) Flatness of the working surface D) Parallelism of the measuring Jaw E) Accuracy 1)Calibration of micrometer A) Zero error Test B) Backlash error C) Banding Test D)Parallelism error test E) Flatness error test

VERNIER DEPTH GAUGE

OUTSIDE MICROMETER

INSIDE MICROMETER

DEPTH MICROMETER

BENCH MICROMETER

DIGITAL MICROMETER

MICROMETER WITH DIAL GAUGE

SCREW THREAD MICROMETER

DIAL BORE GAUGE

HEMISPERICAL BORE GAUGE

TELESCOPIC GAUGE

TELESCOPIC BORE GAUGE

APPLICATION OF TELESCOPIC BORE GAUGE

SLIP GAUGE

WRINGING OF SLIP GAUGE

SLIP GAUGES

LIMIT GAUGE PLUG DOUBLE ENDED‘GO’ AND ‘NOGO’ GUAGE

PROGRESSIVE PLUG GAUGE

TAPER PLUG GAUGE

RING GAUGE

RING GAUGE

DOUBLE ENEDED SNAP GAUGE PROGRESSIVE SNAP GAUGE

ADJUSTABLE SNAP GAUGE

Angular measurement

Angular Measurement : A)Protractors 1)Vernier Bevel Protactors 2)Universal bevel protactor 3)Optical bevel protactors b) Sine Bars C)Sine Centers D)Angle Gauges E) Spirit Level F) Clinometer 1)Vernier clinometer 2)Micromter clinometer G) Auto Clinometer H) Angle Dekkor

APPLICATION OF SLIP GAUGES

Advantages of sine Bar: 1) It is used for accurate and precise angular measurement 2) It is available easily 3) Its is cheap Disadvantage: 1)The application is limited for a fixed centre distance between two plugs or rollers. 2) It is difficult to handle and position the slip gauges If the angle exceeds 45 degree sine bar are impracticable and inaccurate. 3) Large angular error may result due to slight error in sine bar

SOURCES OF ERROR IN SINE BAR : - 1) Error in distance between rollers 2) Error in slip gauges combination used for angle setting 3) Error in equality of size of rollers and cylinders accuracy in the form of rollers. 4) Error in parallelism of roller axes with each other. 5) Error in flatness of the upper surface of the bar

SINE CENTRE

ANGLE GAUGES

SPIRIT LEVEL

VERNIER CLINOMETER

MICROMETER CLINOMETER

AUTO COLLIMATOR