Lesson 4/Learning Event
Wire and Drill
a. The twist drill and drill rod gages, Figure 50, Part A, each have a
series of holes with size and decimal equivalents stamped adjacent
to each hole. One gage measures drill sizes numbers 1 to 60; the
other gage measures drill sizes 1/16 to 1/2 inch by 1/64-inch
intervals.
b. Wire gages, Figure 50, Part B, are circular in shape with cutouts in
the outer perimeter. Each cutout gages a different size wire, from
0 to 36 of the English standard wire gage. A separate gage is used
for American standard wire and another for US standard sheet and
plate iron and steel.
FIGURE 50.
WIRE AND DRILL GAGES (PARTS A AND B)
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