10
/ \
C
HA
PTER ONE
/
C
orr
ect way to grind blade
/ \
\
I \
gree
of
taper de
tennin
es the point size; the No. 1 Phillips
screwdriver will be the most pointed. The points become
more blunt
as their
number
increases.
NOTE
There is another screwdriver similar to the
Phillips, and that
is the Reed and Prince tip.
Like the Phillips. the Reed and Prince
screwdriver tip f orms an "X ", but the Reed
and
Prince tip has a much more pointed tip.
The Reed and Prince screwdriver should
never be used on Phillips screws and vise
versa.
Intermixing these screwdrivers will
cause damage
to
the
.~c
re
w
and
scr
e wdrive
r:
The
screwdriver is a very basic tool. but i
fu
sed improp-
erly
it willdo more
dama
ge than good.
The
slot on a screw
has a defin ite dimension and shape. Through improper
use or selection, a screwdriver can damage the screw
head. making removal
of
the screw difficult. A screw-
driver must be selected to conform to the shape of the
screw head used . Two basic types
of
screwdrivers are re-
quired: standard (flat- or slot-blade) screwdrivers
(Fig
ur
e
17) and Phillips screwdrivers (Ftg
ure
18).
Note the following when selecting and using screwdriv-
ers:
I. The screwdriver must always fit the screw head .
If
the
screwdriver blade is too small for the screw slot,
dam
age
may
occ
ur to the screw slotand screwdriv er.
If
the blade is
too large,
itcannot engage the slot properly and will result
in damage to the screw head.
2. Standard sc
rewd
rivers are identified by the length
of
their blade. A 6-inch screwdriver has a blade six inches
long. The width
of
the screwdriver blade will vary, so
make sure that the blade engages
the screw slot com -
pletely.
3. Phillips screwdrivers arc sized according to thei r point
size. They are numbered one, two. three and four.
The
de-
Correct
taper and size Taper
too
steep
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