Quote:
Originally Posted by FrankJ
You do realize if you ground the blade & the student you are going to have continuity between the 2? Saw will not start using that scheme. Which will keep it safe, but useless. 
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Actually, what I meant was to have a current, probably 12v, 2.5ma being conducted through you. Since this is an open circuit, nothing will flow through you. When you touch the blade, the circuit will be completed and fed into a multi-stage amplifier. This will be fed into a flip-flop that will shut down the motor and arm the brakes, immediately. The machine will shut down and will be "hard" to turn back on (Require that the fault is cleared, etc.)
However, the problem is: if you are machining aluminum, it would automatically trigger, meaning that you would need to measure resistance. I do not see how the SawStop works with metals!