--Never, never have your foot on the trip lever or
complete revolution. If you accidently trip the release
pedal while loading or adjusting plate on the shear.
lever, whatever is beneath the knives will be cut,
Numerous accidents have occurred because of the shear
being accidentally tripped.
The following is a list of some of the more common
--Never cut pipe, bar stock, round stock, flat bar
less than 2 inches in width or other similar metal shapes.
--Become familiar with the type of drop shear
If you attempt to shear these types of metal shapes, you
will damage the cutting knives and risk injury due the
installed in your shop. Qualify on its use and operation
met al flying out from the holddown dogs, since the dogs
under qualified supervision prior to operating the shear.
are designed for flat plate.
--Determine the capacity of the machine being
SHEAR NOMENCLATURE.--As with any
used from the manufacturer's technical manual and
piece of equipment, you should have an understanding
NEVER exceed its maximum capacity. Capacities for
of the major parts of the equipment and their function.
most machines are given in metal thickness, and length,
Figure 13-2 1 illustrates some of the parts common to all
and, unless otherwise noted, are given for mild steel not
drop shears. These parts arc listed as follows:
alloy steels. As metal hardness increases, machine
The finger guard is located on the front of the
machine and is designed to prevent your
--Never place any part of your body under the
fingers from king cut.
knives or dogs (holddowns) of the shear.
--Never place hands or fingers between the metal
Holddowns (dogs) are located behind the
plate and the bed.
linger guard and arc designed to automatically
--Ensure that the metal plate is under a holddown
operate when the release lever is tripped.
These dogs clamp the plate in place with
Figure 13-21.--Common drop shear.