> While not directly applicable, search out that little video of the
> capacitive sensor for table saws. It can detect a finger, stop the
> blade rotation and withdraw the blade all before the finger gets much
> more than a semi-deep cut. I'm on the road at the moment (well, in an
> airport) so I don't have the link. I'm sure someone does though!

Problem is, it only works once, then you need to replace the blade and
brake set. Most lawns have more rocks than people have fingers :)

Cheerful regards,

Bob


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