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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
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
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