USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
FIGURE 197.
THICKNESS (FEELER) GAGES.
c. Types of Wire and Drill Gages.
(1) Twist Drill and Drill Rod. The twist drill and drill rod gage
(figure 198 on the following page) has a series of holes with size and
decimal equivalents stamped adjacent to each hole. One gage measures drill
sizes Nos. 1 to 60; the other measures drill sizes 1/16 to 1/2 inch, by 1/64
inch intervals.
(2) Wire Gages. A wire gage (figure 198) is 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 U.S. standard sheet and plate iron
and steel.
d. Types of Thread Gages.
(1) Center Gage.
The center gage (figure 199 on page 256) is
graduated in 14ths, 20ths, 24ths, and 32nds of an inch.
The back of the
center gage has a table giving the double depth of thread in thousandths of
an inch for each pitch. This information is useful in determining the size
of
254
Previous Page
