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Reply by Richard H

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Posted on How high to raise the blade

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Richard H

489 posts in 1851 days


#1 posted 12-31-2015 04:31 PM


Force vector, the kickback force is less as the angle steepens. A riving knife and a zci are more important than blade height.

M

- MadMark

The amount of force put on the piece of wood is the same as it’s based on the velocity of the teeth which is constant regardless of how high the blade is set because it’s based on the diameter of the blade and the RPM’s of the saw. I looked at the new woodworker video where he deliberately setup kickback and in that video I noticed two different forces at play.

1. The force that caused the wood to lift off of the table saw top. This is based on the force applied by the spinning blade to the back side of the wood and I just don’t see how more or less height is going to make a difference here.

2. The force applied after the bottom of the piece of wood cleared the top of the blade. Once the piece of wood cleared the top of the blade the teeth on the blade pulled it away from the fence in a counterclockwise motion and catapulted it behind the saw pulling the operators hands towards the blade in the process.

I guess one could argue that if you set the blade really high than the amount of energy required to move the kickback into step 2 would be higher. If the operator was applying enough downward force to prevent the piece from escaping the space between the blade and the fence than the kickback would be limited to the piece jumping up off the table and slamming back down again. Even than that’s a lot of ifs and it’s making the big assumption you can overpower the saw in the time it takes to lift the piece past the blade height. That’s a big if in my book.


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