Eli5: how do modern cutting tools with an automatic stop know when a finger is about to get cut?

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I would assume that the additional resistance of a finger is fairly negligible compared to the density of hardwood or metal

In: Engineering

8 Answers

Anonymous 0 Comments

The saw blade carries an electrical current, and the braking system monitors this.

When your hand touches the blade, your *electrical* resistance changes that circuit and triggers the emergency stop.

The stops are quite violent, so don’t test this.

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