Riving Knife - Grizzly G0899 Owner's Manual

Riving Knife

The riving knife works in the same manner as
the spreader on the blade guard assembly. It is a
metal plate that prevents the newly cut workpiece
from pinching the backside of the blade and caus-
ing kickback.
The key difference between the spreader and the
riving knife is that the riving knife mounts below
the blade's highest point of rotation, as shown in
Figure 57.
Minimum 1mm
Maximum 5mm
Figure 57. Height difference between riving knife
and blade.
The height difference between the riving knife and
the blade allows the workpiece to pass over the
blade during non-through cuts (those in which the
blade does not cut all the way through the thick-
ness of the workpiece).
The riving knife acts as a barrier behind the blade
to reduce the risk of hands being pulled into the
blade if a kickback occurs.
The riving knife must be kept within the range
shown in Figure 58. For that reason, we only
recommend using a 10" blade for operations that
require use of the riving knife.
Top Distance
Minimum 3mm
Maximum 8mm
Bottom Distance
Minimum 3mm
Maximum 8mm
Figure 58. Allowable riving knife clearance.
-38-
Height Difference
To ensure that riving knife works safely, it
MUST be aligned with and correctly adjust-
ed to blade. Refer to Page 69 to check or
adjust riving knife alignment.
How to Install the Riving Knife
The riving knife is installed in a similar manner
to the blade guard and spreader. Refer to Blade
Guard Assembly on Page 34 for installation
instructions.
When to Use the Riving Knife
Use the riving knife for all non-through cuts made
with a standard table saw blade (i.e., dadoes or
rabbet cuts, and when using a tenoning jig), or
when using a 10" diameter dado blade.
Also, use the riving knife for those special opera-
tions where the blade guard or its components
get in the way of safe operation, such as with very
narrow cuts.
When Not to Use the Riving Knife
DO NOT use the riving knife with a dado blade
that has a diameter smaller than 10" in diameter.
Otherwise, the riving knife height will exceed the
blade height and the workpiece will hit the riving
knife during the cut, forcing the operator into a
dangerous situation of trying to turn the saw off
with the workpiece stuck halfway through the cut.
In addition, although it is possible to use the riv-
ing knife for through cutting operations, the blade
guard assembly offers far more injury protection
and risk reduction than the riving knife. Therefore,
we strongly recommend that you use the blade
guard assembly with spreader instead of the riv-
ing knife for through cuts.
Model G0899 (Mfd. Since 10/20)