18 / CUTTERS EDGE VENTILATION SAWS
ONE-STEP STARTING PROCEDURE
Since you have properly warmed up the saw, you can start
it now using the One-Step Starting Procedure. After posi-
tioning yourself properly, securely holding the saw in
place, simply pull the starter handle upward (Fig. 17). The
saw will start and you will be ready to cut.
Fig. 17.One-Step Starting
CUTTING
Never cut with the saw directly in line with your
body or across your body.
When ready to begin cutting, choose a position that is safe
and comfortable. Cut with the saw held to one side of your
body, locking yourtop elbow, if possible. Avoid cutting with
the saw directly in line with or across your body.
IMPORTANT
When cutting, always run the saw at full RPMs. It
is important to maintain a high chain speed through-
out your cuts. Do not allow the RPMs to drop by
forcing the saw into the cut.
PENETRATION CUT
To begin your penetration cut, hold the saw at an angle of
approximately forty-five degrees to the roof (Fig. 18). This
positions the highest number of cutters in contact with the
roof surface for optimum penetration speed.
Fig. 18.Penetrate at approximately 45 degrees.
Attempting to penetrate with too high an angle
may cause kickback, while penetrating with too
low an angle will actually increase pentration
time and cause unnecessary wear to the cutters.
Plunge the bar in aggressively for penetration, but don't
penetrate any deeper than necessary. This will prevent
the inadvertant cutting of hidden dangers, such as rafters,
wiring or braces.
After you have penetrated the roof surface, increase the
angle of your saw up to ninety degrees. This places a
greater number of cutters in contact with the broad sur-
faces of the rafters, increasing your sensitivity of feel.
With practice you will get a feel for boring through the roof
surface. If it feels like it is taking too long to penetrate, you
may be directly on a rafter. Simply move your cut over a
few inches and begin to cut again.
"ROLLING THE RAFTERS"
When you feel a rafter, pull the saw up and allow it to cut
only the roof decking as you roll over the rafter (Fig. 19).
Then return to your previous depth of cut until you encoun-
ter another rafter to roll (Fig. 20). This preserves roof
i
ntegrity and provides you with another measure of protec-
tion.
With practice, you will be able to do this quickly and
efficiently.
WARNING
WARNING
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