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UNIT THREE USING VERNIER, DIAL, AND DIGITAL INSTRUMENTS FOR DIRECT MEASUREMENTS 121 Additional partial 27 + millimeters showing on the main scale millimeter to be read on the vernier .36 27.36 millimeters showing on the vernier scale millimeters is the total caliper reading Figure C-86 Reading a metric vernier caliper with .02-mm discrimination. 27 mm + showing on the main scale The coincident point of the vernier scale and the main scale occurs at the 18th vernier division, corresponding to .36 mm 50 division vernier scale with each division equal to .02 mm the main scale at the eighteenth vernier division. Since each vernier scale spacing is equal to .02 mm, the reading on the vernier scale is equal to 18 times .02, or .36 mm. Therefore, .36 mm must be added to the amount showing on the main scale to obtain the final reading. The result is equal to 27 mm + .36 mm, or 27.36 mm. READING VERNIER DEPTH GAGES These measuring tools are designed to measure the depth of holes, recesses, steps, and slots. Basic parts of a vernier depth gage include the base or anvil with the vernier scale and the fine-adjustment screw (Figure C-87). Also shown is the Fine adjustment clamp Fine adjustment screw graduated beam or bar that contains the true scale. To make accurate measurements, the reference surface must be flat and free from nicks and burrs. The base should be held firm- ly against the reference surface while the beam is brought in contact with the surface being measured. The measuring pressure should approximately equal the pressure exerted when making a light dot on a piece of paper with a pencil. Base clamp Vernier scale On a vernier depth gage, dimensions are read in the same manner as on a vernier caliper. SELF-TEST: READING INCH VERNIER Base CALIPERS Determine the dimensions in the vernier caliper illustrations Beam in Figures C-88a and C-88b. SELF-TEST: READING METRIC VERNIER Figure C-87 Vernier depth gage with .001-in. CALIPERS discrimination. Determine the metric vernier caliper dimensions illustrated in Figures C-89a and C-89b. MECHANICAL DIAL INSTRUMENTS FOR DIRECT MEASUREMENT SELF-TEST: READING VERNIER DEPTH In recent years, many types of mechanical dial measuring GAGES instruments have come into wide use. These instruments are Determine the depth measurements illustrated in Figures direct reading and require no interpretation of a vernier. C-90a and C-90b. They are extremely reliable and easy to read. Mechanical-dial
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