> The youtube demo of  'saw stop' shows that it uses a mechanical claw to

> > block the blade instantly. DC method would allow the blade to rotate
> enough to do
> > damage (back EMF only works with MOTION).
> >
> > http://www.youtube.com/watch?v=3DcTUOhYcw4ZY
> > jump to 1:40 to see how it works, and why the claw has to be replaced
> every
> > trigger.
> > Small price to pay to not lose part of a hand to a blade, but not
> > inexpensive.
> > --
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> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
>
> Having used a SawStop, I personally _hate_ them.
>

Ummm, why? They appear to work exactly as advertised.


> (based on a TI msp430 too...)
>

Whatever tool works for the job. Hardly a reason to hate the product.

>
> But I've recently heard a radio blurb about a competitive tech - which I
> believe Martin was describing. - http://www.whirlwindtool.com/
>

Nice to see an easily retrofittable product.

Unfortunately NOT fast enough.

Spec says it stops blade in 1/8 second.
7500 RPM for typical 9" blade is 125 rps x 0.125 sec is 15!! revolutions.
Thats a LOT of chopped up flesh.

Given that human reaction time is around 0.25 sec, not much of an
improvement
on yanking your bleeding hand away after it's too late.

IMO fail...


>
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