Grizzly G0869, Руководство пользователя, Страница: 33 / 72

Model G0869/G0870 (Mfd. Since 01/19)
-31-
Height Difference
Minimum 1mm
Maximum 5mm
Figure 37. 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 38. For that reason, we only
recommend using a 10" blade for operations that
require use of the riving knife.
Minimum 3mm
Top Distance
Bottom Distance
Maximum 8mm
Minimum 3mm
Maximum 8mm
Figure 38. Allowable top and bottom distances
between riving knife and blade.
How to Install the Riving Knife
The riving knife is installed into the spreader/riving
knife clamp in the same way as the blade guard/
spreader (see
Figure 39). Refer to Page 20 for
blade guard assembly/installation instructions.
To ensure that riving knife works safely, it
MUST be aligned with and correctly adjust-
ed to blade. Refer to Page 52 to check or
adjust riving knife alignment.
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 37.
Figure 39. Riving knife installed.
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 operations 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". 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 situa-
tion 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 offers far more injury protection and risk
reduction than the riving knife. Therefore, we
strongly recommend that you use the blade
guard instead of the riving knife for through cuts.
Spreader/
Riving Knife
Clamp
Riving
Knife