Figure 2-20.Portable power shears
Figure 2-21.Solid punch.
Figure 2-22.Hollow punch.
the hammer. Turn the punched section over so the
burred section is up, then smooth it with a mallet.
FOOT-ACTUATED SQUARING SHEARS (fig.
2-24) make it possible to square and trim large sheets.
Do not attempt to cut metal heavier than the designed
capacity of the shears. The maximum capacity of the
machine is stamped on the manufacturers
Figure 2-24.Foot-actuated squaring shears.
specification plate on the front of the shears. Check
the gauge of the metal against this size with a
SHEET-METAL GAUGE (fig. 2-25). This figure
shows the gauge used to measure the thickness of
metal sheets. The gauge is a disc-shaped piece of
metal, having slots of widths that correspond to the
U.S. gauge numbers from O to 36. Each gauge number
is marked on the front and the corresponding decimal
equivalent marked on the back.
Do NOT cut wire, band iron, or steel rods with the
Figure 2-23.Correct method of backing sheet metal for making a hole with a punch.