Precision Measurement Vernier Calipers and Micrometers in Metric and Imperial M.Friesen 2017
Vernier Calipers STANDARD DIAL DIGITAL Metric/Imperial Metric/Imperial
Standard Comes in Metric and Imperial measurements with scales on the top and bottom. Main Scale Vernier Scale Sizes can range from 6” (15cm) – 12” (30cm)
HOW TO READ METRIC 10 mm 0.02mm 0.10 mm
Closest measurable tolerance READING METRIC 20 mm + 1 mm + 0.02 mm = 21.02mm 0.02mm Closest measurable tolerance
HOW TO READ IMPERIAL (Decimal) 0.001 Inch 0.10 Inch (4 x 0.025”) 1 Inch (10 x 0.100”)
READING IMPERIAL (Decimal) 1.000” + 0.050” + 0.023” = 1.073”
DIAL CALIPERS
HOW TO READ METRIC Instead of a sliding Vernier Scale, a dial caliper uses a dial. Each increment is 0.01mm ANSWER? 16.20mm
HOW TO READ IMPERIAL 1.682” This Imperial dial is divided in half. Each increment is 0.001” You could also find both Metric and Imperial dials that are not divided. ANSWER? 1.682”
DIGITAL CALIPERS Can be changed from Metric to Imperial by the push of a button
MICROMETERS Standard Micrometer Metric/Imperial Vernier Style Micrometer
THE PARTS OF A MICROMETER Metric or Imperial
For a micrometer to work effectively we need to know the approximate size before using this precision instrument
READING METRIC 0 – 25mm 0.01mm 5mm + 0.50mm + 0.28mm = 5.78mm
READING METRIC WITH A VERNIER SCALE 0 – 25mm 0.001mm 5 5mm + 0.50mm + 0.28mm + 0.003mm = 5.783mm
Lines in between dollars = QUARTERS READING IMPERIAL 0 – 1” 0.001” 0 – 24 = CENTS 0.001 Lines in between dollars = QUARTERS 0.025 Large numbers = DOLLARS 0.100
READING IMPERIAL 0 – 1” 0.001” .200” + 0.075” + 0.001” = 0.276”
READING IMPERIAL WITH A VERNIER SCALE 0 – 1” 0.0001” 0.2000”+ 0.0750”+ 0.0090” + 0.0005” = 0.2845”
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