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Riving Knife
The riving knife works in the same manner as the |
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spreader on the blade guard assembly. It is a metal plate |
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that prevents the newly cut workpiece from pinching the |
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backside of the blade and causing kickback. |
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The key difference between the spreader and the riving |
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knife is that the riving knife mounts below the blade's |
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highest point of rotation, as shown in Figure 43. |
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The height difference between the riving knife and the |
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blade allows the workpiece to pass over the blade during |
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| Figure 43. Height difference between the | |||
all the way through the thickness of the workpiece). |
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| riving knife and blade. |
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The riving knife acts as a barrier behind the blade to |
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reduce the risk of hands being pulled into the blade if a |
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kickback occurs. |
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The riving knife must be spaced away from the blade, as |
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shown in Figure 44. |
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Riving Knife Installation |
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The riving knife is installed in a similar manner to the |
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blade guard and spreader. Refer to Blade Guard Assembly |
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on Page 28 for installation instructions. |
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When to Use the Riving Knife |
| Figure 44. Allowable distance ranges | ||
| between the riving knife and blade. | |||
Use the riving knife for all | When Not to Use the Riving Knife | |||
standard table saw blade (i.e., dadoes or rabbet cuts, and | ||||
when using a tenoning jig), or when using a 10" diameter | Do not use the riving knife with a dado | |||
dado blade. | blade that has a diameter smaller than 10" | |||
Also, use the riving knife for those special operations | in diameter. Otherwise, the riving knife | |||
height will exceed the blade height and | ||||
where the blade guard or its components get in the way | the workpiece will hit the riving knife | |||
of safe operation, such as with very narrow cuts. | 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. |
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In addition, although it is possible to use the riving knife for
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