USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
NOTE
Do not remove any more material than is necessary.
3.
Screwdrivers
a. Purpose.
Screwdrivers are used for driving or removing screws or
bolts with slotted or special heads.
b. Types of Screwdrivers.
(1) General. Screwdrivers are made in various shapes and lengths to
perform specific jobs. The size of a screwdriver (figure 7) is indicated by
the length of the blade; i.e.; a 6 inch screwdriver has a 6 inch blade. The
width and shape of the blade tip vary from a narrow parallel sided tip to a
wide tapered tip.
Some screwdrivers have special tips for cross-slotted
recessed screws or bolts and clutch-bit screws.
Special screwdrivers are
provided with a ratchet arrangement.
FIGURE 7.
STANDARD SCREWDRIVER.
(2) Common Screwdriver.
The common screwdriver (figure 8
on the
following page) has a round steel blade anchored in a wood or
plastic
handle.
The blade is forged from alloy steel and tempered.
The
tip is
flat, hot forged to size, and heat treated. Common screwdrivers are
tapered
to give maximum strength.
Handles are made of hardwood or
plastic
composition, usually fluted for a good grip. The
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