VERNIER CALIPER
measuring accuracy
0.02mm
parts of instrument
application
measuring workpiece thickness
measuring shaft
measuring slot
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measuring step of a shaft
sources of errors
types of measuring instrument
depth vernier caliper
Reading of scale
a. workpiece not inserted far enough into the measuring jaws. errors will become more when too much force is applied during measurement.
b.vernier caliper tilted during use,especially when taking the depth.
c. dirty measuring surfaces.
d.too little or too much force applied during measurement.
e. damage and worn out of the measuring surfaces.
f. the measuring surfaces do not rest perpendicular to the reference
digital caliper
dial caliper
MICROMETER
PARTS OF INSTRUMENTS
APPLICATIONS
READING OF SCALE
1. to check thickness of pipe wall
2. to check gear tooth thickness, steps, grooves, recesses
3. to check steps, key shafts, grooves, recesses, core dias
4. to check small steps, grooves recesses
SOURCES OF ERRORS
TYPES OF MEASURING INSTRUMENTS
measuring accuracy
=0.5 spindle pitch/50 graduations
1. EXTERNAL MICROMETER
2. DEPTH MICROMETER
3. INTERNAL MICROMETER
1. misreading
2.dirt on the anvil and spindle
3. wear and damage on the anvil and spindle
4. pitch errors
5. miscalibrate
6.applied too much force when measuring
=0.01mm
TUTORIAL FOR VERNIER CALIPER AND MICROMETER SCREW GAUGE
thats all from archimedes'team
thank you !