Measuring Tools. Introduction. Measuring tools for small engines are divided into three categories. Direct reading Measurement transferring Reject gages. Direct Reading Measuring Tools. Small engines use two types of direct reading measuring tools: Micrometers Calipers. Micrometers.
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Measuring tools for small engines are divided into three categories.
Small engines use two types of direct reading measuring tools:
Micrometer calipers are available in mechanical and digital models.
Sum (measurement) 0.365
Read the inside micrometer in the illustration.
Smallest whole unit 1.500
Twenty Five Thousands 0.025
Sum (reading) 1.734
In this example a 1/2 inch extension has been added.
Smallest whole unit 2.000
Twenty five thousands 0.075
Note: when the zero on the thimble is close to the reference line and a 25 thousands line is close to the edge of the thimble, it may be difficult to determine if the last line that should be counted. If the thimble zero is above the reference line the line is not counted. If it is below it should be counted.
Read the depth gauge micrometer in the illustration
Smallest whole unit 0.000
Twenty Five Thousands 0.050
Sum (reading) 0.867
Read the Vernier caliper in the illustration.
Sum (measurement) 1.211
A dial replaces the Vernier.
This makes the caliper easier to read.
The reader must still determine the units and graduations.