I'm building a desk from African Sapele for a friend and began rough cutting the wood to size a few weeks ago. It got really cold (teens) for a week and I got sick following that, so I just got back to it this week. He bought the boards already surfaced, 3/4".
Thursday was unseasonably warm, almost 70 degrees so I went out to the shop as soon as I got home from work to continue. 2 of the boards developed a twist (they were stickered), so I'll try flattening them on my jointer.
I started ripping a 14"L x 7"W board. About halfway through, I couldn't push it anymore. I stopped the saw and realized the kerf pinched my MJ Splitter and it was being pulled out of the saws throat plate. When I tried removing the board, I saw the kerf was also pinching the blade, although not as tightly as the splitter. Luckily I was also using JessEm Clearcut tablesaw stock guides. I'm sure if I hadn't been the board would have been thrown.
What caused this to happen? Is this due to change in humidity/moisture level in the wood, or internal stress that was already there in the board? I checked the board with a moisture meter and there was over 1% difference from 1 end of the board to the other. I've never had this happen and want to avoid it going forward. The wood is stored in the shop which is not climate controlled and is heated when needed. Here's a link to a few pics.
https://goo.gl/photos/21zgmE5RqSjmLCNPA