217.28
Figure 13-20.—Hand-operated turret punch.
Hand-Operated Turret Punch
A hand-operated turret punch is shown in
figure 13-20. Twelve mated punches and dies are
mounted in a rotating turret. Stamped on the front of
each die block is the size of hole it will punch, as well
as the thickness of the material it will accommodate.
When you are punching stainless steel or other alloys,
you must remember that these capacities are for mild
steel.
The operation of the turret punch is simple. First,
release the locking handle on the side of the punch
frame, rotate the turret until the desired punch set is
lined up with the actuating mechanism (ram), and
then lock the turret into position. Then punch the hole
by pulling the operating lever toward you. This
actuates the ram and punch.
Sheet Metal Bending Equipment
There are a several types of sheet metal bending
equipment that are used to form or bend sheet metal.
In the following text, we will discuss the function of
this equipment.
VISE.—Vises are used for holding sheet metal
when it is being shaped or riveted. Figure 13-21
shows the most common bench vises that are used
throughout the Navy. The machinist’s bench vise is
the one most generally used for forming sheet metal.
The machinist’s bench vise is a large steel vise with
rough jaws that prevent the work from slipping. It has
a swivel base, allowing the user to position the vise in
Figure 13-21.—Common types of bench vises.
13-14
