Reply by runswithscissors

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Posted on An alternative to Saw Stop?

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2724 posts in 1990 days

#1 posted 01-22-2013 07:46 AM

An update: Thinking continues to evolve. My Unisaw arbor pivots from the front, or near side of the table. If the arbor pivoted from the rear, or far side, of the table, the belts from the motor would tend to pull it down (not depending just on gravity). The switch should cut the motor at the same instant, to save belts from damage when they go slack (not actually sure whether that would be a problem). I’m not having any insight as to how the riving knife would work into this.

Another way that would allow the riving knife (which is the way at least one of Grizzly’s models works) is to simply drop the arbor straight down, rather than pivoting it down. But I do think the blade would get out of there most quickly by pivoting from the rear, pulled down by gravity and the drive belts simultaneously. I bet this could be made to be very quick acting. Dare I say it? Maybe even faster than the Saw Stop?

I’m trying to picture it: your finger (or hotdog) accidentally touches the blade, and POOF, it disappears beneath the ZCI. No damage done. You turn off the saw, press a button to reset the mechanism, crank up the arbor, and you’re in business again. Seems like it could work with dadoes as well.

It would be nice to hear other approaches, objections, caveats, etc. I know that this is the kind of topic that can bring out the best (and the worst) in woodworkers.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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