PRECISION INSTRUMENTS EXPLAINED

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PRECISION INSTRUMENTS EXPLAINED

• MICROMETERS
• CALIPERS
• GAGE BLOCKS

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HOW PRECISE DO I NEED TO BE ?WE NEED TO BE ABLE
TO ACCURATELY MEASURE PARTS TO 1/1000 OF AN INCH
OR AS A DECIMAL - .001

• .001
• TENTHS
  THOUSANDS
• HUNDREDS

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MICROMETER PARTS
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Divisions
0.001 Division
Barrel Scale
Thimble Scale
0.025 Division
0.100 Division
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Reading a Micrometer

• Observe the greatest 0.100-inch division on the
  barrel scale.
• Observe the number of 0.025-inch divisions on the
  barrel scale.
• Add the thimble scale reading (0.001-inch
  division) that coincides with the horizontal line
  on the barrel scale.

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• Observe the greatest 0.100-inch division on the
  barrel scale. (three 0.100 0.300)

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• Observe the number of 0.025-inch divisions
  between the 0.300-inch mark and the thimble. (two
  x 0.025 0.050)

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• Add the thimble scale reading that coincides with
  the horizontal line on the barrel scale. (eight
  0.001 0.008)

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TYPES OF CALIPERS

• VENIER
• DIAL
• DIGITAL

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OUTSIDE MEASURING JAWS BAR SCALE

• PARTS OF A CALIPER
• INSIDE MEASUREING JAWS
• DIAL .001
  DEPTH GAGE
  

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Divisions
0.100
1.000
0.010
0.001
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Reading Calipers

• Observe the greatest 1.000 division

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• Observe the greatest 0.100 (0.100 0.600)

1.000 0.600
0.600
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• Observe the greatest 0.010 (0.010 0.000)

0.000
1.000 0.600 0.000
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• Observe the greatest 0.001 (0.001 0.005)

1.000 0.600 0.000 0.005

1.605
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GAGE BLOCKS AREVERY ACCURATE MEASURING STANDARDS
TO 1\1,000,000 IN.
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FIVE INDIVUAL GAGE BLOCKS FROM SET
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RINGING TWO BLOCKS TOGETHER SO THEY ATTACH
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GAGE BLOCKS RUNG TOGETHER TO GIVE AN ACCURATE SIZE