I broke my second 1/8 cutting bit today, I was cutting a purchased project, in 3/4 pine, it was on it's second cutting pass when it broke. I'm going to check the cover switch to make sure vibration isn't slowing the spindle once in a while, other than that I'm looking for any other suggestions. It was my second bit, but I can't remember which of my machines the first one broke on, it was a while back.... might make diagnosis of a problem a bit harder