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Learn about dial calipers, steel rules, and micrometers for precise measurements in thousandths of an inch. Understand how to use dial calipers as outside, inside, and depth gauges. Follow steps to reset the caliper to zero and read measurements accurately.
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Precision Measurement Tools • Dial Caliper • Steel Rule • Micrometer
Dial Caliper • A dial caliper is a precision measuring device that can measure in thousandths of an inch. The dial caliper functions as an: • Outside caliper • Inside caliper • Depth gauge
Outside caliper Using the dial caliper as an outside caliper
Inside caliper Using the dial caliper as an inside caliper
Depth gauge Using the dial caliper as a depth gauge
Resetting the dial caliper to zero Step 2 Step 1 Begin by gently closing the calipers. Do not over tighten, close the jaws until they are touching Gently turn the glass dial until the indicator reads zero. Note the indicator is not on zero
Measuring with a dial caliper What is the reading on the dial caliper at the left? ?
Measuring with a dial caliper 1.000 One inch
Measuring with a dial caliper 1.000 .300 One inch three hundred
Measuring with a dial caliper 1.000 .300 + .050 1.350 One inch three hundred fifty thousands
1.000 One inch Measuring with a dial caliper
Measuring with a dial caliper 1.000 .800 One inch eight hundred
Measuring with a dial caliper 1.000 .800 + .075 1.875 One inch eight hundred seventy five thousands
What is the reading on this caliper? Nine hundred and ninety thousands
What is the reading on this caliper? Two inch two hundred and sixty thousands
What is the reading on this caliper? Four inch one hundred twenty five thousands
The thimble consists of a graduated scale that reads from 0-9. There are four marks between each number. Each mark signifies .025 (twenty five thousands). Micrometer
The sleeve has a graduated scale that runs from 0-20 with 10 marks in between. Micrometer - sleeve
The micrometer reads .100 of an inch Reading the Micrometer There are four marks on the thimble. 4*.025 = .100 Zero marks on the sleeve.
.271 or two hundred seventy one thousands Reading the Micrometer Two numbers on the thimble .200 There are almost three lines after the last whole number 2*.025 = .050 21 on the sleeve.
Steel Rules The top rule measures in fractional values The bottom rule measures in decimal values