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Figure 41
The process of cutting 1/8" to 13/16" grooves in
workpieces is accomplished by the use of a
stacked dado blade set or an adjustable type blade
mounted on the saw arbor. By using various
combinations of stacked dado blades, or properly
setting the dial on an adjustable blade, an accurate
width dado can be made. This is very useful for
shelving, making joints, tenoning, etc.
The guard, riving knife, and anti-kickback pawls
supplied with the saw should be used for all cutting
operations where they can be used. When
performing operations where the guard cannot be
used, as in some dadoing operations, alternative
safety precautions should be taken. These include
push sticks, feather boards, filler pieces, fixtures,
jigs and any other appropriate device that can be
utilized to keep operators’ hands away from the
blade. Upon completion of the operation requiring
removal of the guard, the entire guard assembly
must be placed back on the machine in its proper
working order.
Never use a dado head in a
tilted position. Never operate the saw without
the blade guard, riving knife and anti-kickback
pawls for operations where they can be used.
11.0 Safety devices
Feather board
Feather boards can be purchased at most tool
stores, or made by the operator to suit particular
applications. The feather board (Figure 42) should
be made of straight grain hardwood approximately
1" thick and 4" to 8" wide depending on the size of
the machine. The length is developed in
accordance with intended use.
Feather boards can be fastened to the table or rip
fence by use of C-clamps. Alternatively, drilled and
tapped holes in the table top allow the use of wing
nuts and washers as a method of clamping. If this
method of fastening is used, provide slots in the
feather board for adjustment. (The illustration
shows a method of attaching and use of the
feather board as a vertical comb. The horizontal
application is essentially the same except that the
attachment is to the table top.)
Figure 42
Filler piece
A filler piece (Figure 43) is necessary for narrow
ripping and permits the blade guard to remain on
the machine. It also provides space for the safe
use of a push stick.
Figure 43 – Filler Piece