Reply by Kazooman

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Posted on Violent kickbacks when cutting trim miters on tablesaw

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1317 posts in 2339 days

#1 posted 01-16-2018 06:16 PM

You do understand that it is the cut off that was thrown, not the piece that was clamped to the fence. The cut off wasn’t clamped to anything.
- Kazooman

At that angle and with a rounded bottom, the pieces are going to fall away from the blade, not into it. Try it. And the saw must have a lot of vibration to move a piece that size into the blade hard enough to throw it back.

Here s a crude drawing of how the offcut will land. I don t think it would be thrown back unless it was rotating or twisting into the blade.

- Rick_M

I am not going to try it, since I do not care to get injured. The OP has tried it and he has told everyone that he had repeated kickbacks of the off cut piece when the rounded portion was on the table. Changing that practice so the rounded edge was not down cured the problem. That seems pretty definitive to me. No need for me to do any experimentation. I believe the OP.

Regarding your drawing. The small off cut piece you show is resting on the rounded face which is at a 45 degree angle to the blade. All things being equal it could roll forward away from the blade or roll backwards hitting the teeth and subsequently launching across the shop. However, all things are not equal. That piece was just cut off by a rapidly rotating saw blade that was pushing it backwards. Any friction between the blade and the off cut is going to cause it to roll backwards and into the blade. The OP has found this to be the case.

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