Figure 193. Using Outside Micrometer.

Use And Care Of Handtools And Measuring Tools
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cylindrical part with a micrometer, it is necessary to "feel" the setting to

be sure that the spindle is on the diameter, and to also check the diameter

in several places to determine the amount of out-of-roundness.

(d) For measuring very large diameters, micrometer calipers are

made in various sizes up to 168 inches. Figure 194 on the following page

shows a pulley being checked with a micrometer whose range has been reduced

by a special anvil which has been screwed into the frame.

A set of

different length anvils permits the use of this micrometer over a wide range

of sizes; yet the spindle only moves 1 inch.

This micrometer has been

lightened in weight by the I-section construction and by boring holes in the

frame.

247

Index