precision instruments explained micrometers calipers gage blocks
Post on 11-Jan-2016
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PRECISION INSTRUMENTS EXPLAINED
• MICROMETERS
• CALIPERS
• GAGE BLOCKS
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
Decimal to FractionDecimal to FractionConversionsConversions
.125 = 1/8”.125 = 1/8”
.250 = 1/4”.250 = 1/4”
.375 = 3/8”.375 = 3/8”
.500 = 1/2”.500 = 1/2”
.625 = 5/8”.625 = 5/8”
.750 = 3/4”.750 = 3/4”
.875 = 7/8”.875 = 7/8”
1. = 1”1. = 1”
.0625 = 1/16”.0625 = 1/16”
.1875 = 3/16”.1875 = 3/16”
.3125 = 5/16”.3125 = 5/16”
.4375 = 7/16”.4375 = 7/16”
.5625 = 9/16”.5625 = 9/16”
.6875 = 11/16”.6875 = 11/16”
.8125 = 13/16”.8125 = 13/16”
.9375 = 15/16”.9375 = 15/16”
MICROMETER PARTS
• Ratchet Screw• Thimble• Thimble Scale• Barrel• Barrel Scale• Frame• Spindle• Anvil
Divisions
0.025” Division
0.100” Division
0 1 2 3
0
0.001” DivisionBarrel
ScaleThimbleScale
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.
• Observe the greatest 0.100-inch division on the barrel scale. (three 0.100” = 0.300”)
0 1 2 3 10
5
• Observe the number of 0.025-inch divisions between the 0.300-inch mark and the thimble. (two x 0.025” = 0.050”)
0 1 2 3 10
5
• Add the thimble scale reading that coincides with the horizontal line on the barrel scale. (eight 0.001” = 0.008”)
0 1 2 3 10
5
Micrometer reading0.300”
0.050”
0.008”0.358”
+
TYPES OF CALIPERS
VENIER
DIAL
DIGITAL
OUTSIDE MEASURING JAWS BAR SCALE
• PARTS OF A CALIPER
• INSIDE MEASUREING JAWS • DIAL .001 DEPTH GAGE
0 1
10
2030
4050
60
70
80
90 0
0.100”1.000” 0.010” 0.001”
Divisions
Reading Calipers
• Observe the greatest 1.000” division
0 1
10
20
30
405
0
60
70
8 0
90
0
1.000”
0 1
10
2030
4050
60
70
80
90 0
•Observe the greatest 0.100” (0.100” = 0.600”)
0.600”1.000”0.600”
•Observe the greatest 0.010” (0.010” = 0.000”)
0.000”
0 1
10
2030
4050
60
70
80
90 0
1.000”0.600”0.000”
•Observe the greatest 0.001” (0.001” = 0.005”)
0 1
10
2030
4050
60
70
80
90 0
0.005” 1.000”0.600”0.000”0.005”+1.605”
GAGE BLOCKS AREVERY ACCURATE MEASURING STANDARDS TO 1\1,000,000 IN.
Project Lead The Way, Inc.®
Principles of EngineeringResource Guide
FIVE INDIVUAL GAGE BLOCKS FROM SET
RINGING TWO BLOCKS TOGETHER SO THEY ATTACH
GAGE BLOCKS RUNG TOGETHER TO GIVE AN ACCURATE SIZE
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