I've been turning a long time and never had a tool snap in two before. I was hollowing a spalted maple NE bowl and had only gotten a couple of inches into it when my gouge snapped. As you can see from the pictures it was a Oneway Mastercut 1/2" bowl gouge. There was no catch. I was making light cuts. Metal fatigue? Thankfully it wasn't forcefully ejected and just dropped out.