Tom,

assuming it wasn't a dado set he was using, it is likely the blades were
steel and not carbide tipped. Should you have a stack of carbide spinning at
3450rpm and one blade either slips or stops, the remaining blades will have
so many teeth missing it'll look like the nightshift at the WaffleHouse.

This assumes the freed teeth haven't turned you into a colander and you are
still physically capable of looking at the mess.

--
Greg


"Tom Lewis" wrote in message ...
Some 40 years ago when I was in high school the shop teacher would stack
regular saw blades together to make dado cuts. Why shouldn't that be
done?

Tom