l i n e a r m e a s u r e m e n t

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 -0.011)Outsdie Mircometer2)Inside Micrometer3)Depth micrometer4)Bench Micrometer5)Digital micrometer6)Micrometer with Dial gauge7)Screw thead micrometer

Bore guage1) Dial Bore gauge2) Hemipherical bore gauge

Telescopic gauge

Slip Gauge

Limit gauge1) Plug gauge2) Progressive Plug gauge3) Ring gauge4) Snap gauge5) Progressive snap gauge

Calibration of linear measurement

1)Calibration of vernier calliperA)Hardness Test on working facesB) Flatness and squareness of beamC) Flatness of the working surfaceD) Parallelism of the measuring JawE) Accuracy

1)Calibration of micrometerA)Zero error TestB) Backlash errorC) Banding TestD)Parallelism error testE) 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 GAUGEPLUG DOUBLE ENDED‘GO’ AND ‘NOGO’ GUAGE

PROGRESSIVE PLUG GAUGE

TAPER PLUG GAUGE

RING GAUGE

RING GAUGE

DOUBLE ENEDED SNAP GAUGEPROGRESSIVE SNAP GAUGE

ADJUSTABLE SNAP GAUGE

Angular measurement

Angular Measurement :-A)Protractors1)Vernier Bevel Protactors2)Universal bevel protactor3)Optical bevel protactorsb) Sine BarsC)Sine CentersD)Angle GaugesE)Spirit LevelF)Clinometer1)Vernier clinometer2)Micromter clinometerG) Auto ClinometerH) Angle Dekkor

APPLICATION OF SLIP GAUGES

Advantages of sine Bar:-

1) It is used for accurate and precise angular measurement2) It is available easily3) 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 gaugesIf 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