|Forum topic by bbasiaga||posted 02-03-2013 04:19 AM||932 views||0 times favorited||8 replies|
02-03-2013 04:19 AM
I was milling down a 2×4 today for part of a jig for my table saw. The first thing I noticed was that one end of it kept ‘crooking’ even after jointing. The board was flat, but developed about a 5 degree bend at one end. I’d cut it long and didn’t think much of it. I would just cut that part off as I went to final length.
After doing that, it came to rip to final width. So i set the fence and started going. About 11” in, it started to get hard to push though the blade, as if it was dull. Its a new blade so that wasn’t it. There was a knot in the area so I thought I was just getting in to that, slowed down the feed speed and the next thing I know – the circuit breaker tripped. I hit the power switch on the saw and went to clear the piece of wood, and had to literally pry it off the blade and riving knife. It was ON THERE! Once free, the 1/8” gap left by the saw blade snapped closed with such force it activated the electronic cut off on my hearing protection. I couldn’t pry that back open if you paid me.
Obviously, there was some kind of hidden stress in the wood, and had it not been for the riving knife who knows what would have happened. I’m pretty new to this hobby, so I can’t really explain why it happened. Maybe someone more knowledgeable about wood can provide some theories. All I have to say is – Thank God for safety devices.
-- Part of engineering is to know when to put your calculator down and pick up your tools.