Porter-Cable 548 Instruction Manual page 10

BASE INSERT
Two base inserts, like the one shown in Fig. 3, are available to reduce
splintering the top fibers of plywood
and other splinter-prone materials. One
insert has a short center slot for use with
tapered tooth blades up to
other insert has a long center slot for
use with tapered tooth blades that are
" wide. DO NOT USE BASE INSERTS
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WITH ANY TYPE BLADES OTHER THAN
THOSE DESCRIBED. TO DO SO, MAY
RESULT IN BLADE BREAKAGE OR
DAMAGE TO THE SAW.
To install insert, remove saw blade from
Bayonet Saw and locate insert in the throat of the saw base with the slot
forward and the beveled side of the slot up. Install appropriate blade as
outlined in section INSTALLING THE BLADE with the blade body in the slot
of the insert.
To unlock the lock button, squeeze trigger allowing lock button free
to spring out, and release.
When cutting plywood with the base insert installed in the saw, it is not necessary
for the good or finished side of the material to be down as would be the practice
with an ordinary jig saw. The small teeth of the blade and speed of the saw in
conjunction with the base insert will prevent splintering or chipping of the top
surface.
PLUNGE CUTTING
resulting from accidentally cutting into a live wire. HOLD SAW AS
ILLUSTRATED IN Fig. 4.
One of the distinctive
and important features
the Porter-Cable bayonet
saw is the ability to start the
cut (in wood only) within an
area without making drilled
holes first. This is especially
important when making
cut-outs for electric outlets
in finished walls, openings
in cabinet tops for sinks
and openings for plumbing
fixtures.
First, measure the area
to be cut out and mark
it clearly with a pencil,
chalk or scriber. Choose a
convenient starting point and hold the bayonet saw over the point and inside the
line of waste. Tip the machine forward until the front edge of the base rests firmly
on the surface of the material with the tip of the blade clear of the work surface,
as shown in Fig. 4. Turn motor "ON" and slowly lower the back of the machine
allowing blade to bite into surface of work. Do not move the machine forward until
the base is fully seated on the surface of the work.
" wide. The
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When cutting into a wall avoid contact with all exposed
metal on the tool to prevent electrical shock hazard
Fig.4
Fig.3
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