Wow! Here's a video of the guy who invented SawStop sticking his finger into a tablesaw. The SawStop system measures an electrical signal on the blade and when that signal changes like when a saltwater filled meat-stick (i.e. - a hotdog or a human finger) comes in contact with it it will release a spring and force the blade down into an aluminum block. Truly an amazing design but what's more amazing is the inventor's faith in his creation. I guess if you're going to claim this thing works you better be willing to back your words up.
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