Woodscavenger, they split while turning. Out of the eleven pen halves I turned today, only three of them split, and two of those were the cedar, which were the first set of blanks that I turned. For the cedar, I think it was a combination of the fact that both of the blanks had knots in them, and I think I had the skew at too aggressive an angle when it contacted the knot. For the other blank, a cocobolo, I think again I was a bit too aggressive; it was toward the end of the day, the sun had gone down, and the temperature had dropped from around 50 degrees Farenheight (comfortable with a sweatshirt) to about 40 (hands starting to get VERY cold!).