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Transcript

VERNIER CALIPER

measuring accuracy

0.02mm

parts of instrument

application

measuring workpiece thickness

measuring shaft

measuring slot

we are born to be an engineer.

InsyaALLAH

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 !

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