Sketch 3
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Sketch 4
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THE RIVING KNIFE AND ITS ADJUSTMENT:
The riving knife (see adiacent sketch) is an important safety
device on a circular saw. It prevents the saw kerf "closing
up" which could cause the wood to "kick back". The riving
knife will be correctly adiusted when it is 5/64" - 3/32"
clear of the tips of the teeth on the saw blade. The riving
knife is secured by clamping bolts.
The circular-saw cover plate should be removed to enable the
riving knife to be adjusted.
OPERA Tl NG OF THE CIRCULAR SAW:
The machine must be tilted to the "circular-saw" position.
The ball handle (see sketch) is pulled away from the motor
to engage the clutch. The clutch dogs will engage more
easily if the sanding disc is turned by hand.
The switch is moved through
II
Position l
II
to
II
Position 2
11
(3000
r. p. m. ) .
The clutch must never be engaged or disengaged while the
motor is running.
SAFETY PRECAUTIONS:
circular-saw
· band-saw pos1ii:;;;s
l. Always use saw blades in perfect condif'ion and free from
cracks (i.e. properly sharpened and set).
2. The saw blade must be firmly clamped on the saw spindle and its teeth must point in the correct
direction.
3. The blade projection should be adjusted to suit the thickness of the material to be cul'.
4. The riving knife must always be used and should never be removed.
5. The saw guard should always be set as low as possible.
6. The feed should be adapted to suit the material being worked.
7. Loose knots should be knocked out before sawing to avoid the danger of the wood kicking back.
HI N T S F O R U S E OF T HE
C I R C ULA R S A W :
Sketch 5
RIP-SAWING WITHOUT A FENCE:
The coarse-tooth blade should be used for rip-sawing. To
prevent the wood binding on the saw, a curved piece
must be laid with the convex side resting on the table.
The cut pieces will then fall away from the blade
(Sketch 5) .
RIP-SAWING WITH FENCE:
Material can be cut
accurately to width
only if one edge is
first trued up (Sketch 6).
The fence is then
set to the required
dimension as shown
on the scale marked
on the saw table
(Sketch 6),
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Sketch 6