TM 1-1500-204-23-9
Figure 3-70. Thickness Gauge
Figure 3-71. Using a Thickness Gauge
3-18. Sheet Metal and Wire Gauge. The sheet
metal and wire gauge, shown in figure 3-72, is used for
measuring the diameters of wires or the thickness of
sheet metal.
a.
Types. The type of sheet metal and wire
gauge
to be used depends on the type of material being
measured, as follows:
GAUGE
TYPE
MATERIALS
English Standard
Iron wire, hot-and cold-
rolled sheet steel
American Standard
Non-ferrous sheet metal
and wire
US Standard
Sheet and plate iron
and steel
Steel wire gauge
Steel wire
b.
Use. As previously stated, sheet metal and
wire gauges can measure both sheet metal thickness
and wire diameter (see figure 3-72).
(1)
Sheet
metal.
To
measure
the
thickness of a piece of metal, proceed as follows:
(a)
Remove any burrs from the
location where the gauge will be applied.
CAUTION
Do not force the metal into the slot.
Damage to the metal can result.
(b)
Find the slot that refuses to
pass the metal without forcing.
(c)
Try the next larger slots until
one is found that passes the metal. This is the correct
size.
NOTE
The decimal equivalent of the gauge
number is shown on the opposite side of
the gauge.
(2)
Wire. To measure wire diameter,
proceed as follows:
CAUTION
Do not force the wire into the slot. The
wire
can
be
crimped
and
possibly
rendered useless.
Figure 3-72. Measuring Sheet Metal and Wire
3-33
