eli5. How do table saws with an auto stop tell the difference between wood and a finger?

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eli5. How do table saws with an auto stop tell the difference between wood and a finger?

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Anonymous 0 Comments

I was doing a project at a freinds house, he handed me a peice of wood and asked if i could chop six inches off the end of it, the wood was slightly damp because we were working outside.
Id never seen an auto-stop before and didnt know he had one. As soon as the damp wood touched the blade there was a loud bang and the blade was gone. I thought the blade had hit a nail or something and shattered.
Scared the hell out of me, cost him close to $100 for a new blade and stop. Seemed effective though, the wood barely had a mark on it.

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