USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
USING THICKNESS (FEELER) GAGES.
j. Use of Thickness (Feeler) Gages. Thickness (feeler) gages are used
in one of two ways, as a means for determining a measure or a means for
adjusting to a definite limit. Figure 205, view A, shows a thickness gage
being used to check piston ring gap clearance in a cylinder bore. A long
blade thickness gage is being used to determine the fit between large mating
surfaces in figure 205, view B.
By combining blades it is possible to
obtain a wide variation of thicknesses.
k. Use of Wire and Drill Gages. The use of a drill gage is shown in
figure 206, view A, on the following page. The size of a drill is being
determined; the drill size or number and decimal size are stamped on the
gage beside each hole. A chart on the gage indicates the correct size of
drill to use for a given tap size. Determine the size of both sheet stock
and wire by using a correct sheet and plate or wire gage, as shown in figure
206, view B.
l. Use of Thread Gages.
(1) Center Gage. Check the angle of thread cutting tools as shown in
figure 207 on the following page.
The gage is also used to check cut
threads and the scales are used to measure threads per inch.