A board sawn through the heart of a log is called quarter sawn and the annular rings are 90º-60ºto the face, As the log is further sawn, the ring- to-face angle will progressively flatten. A rift sawn, or rift cut, board has an annular ring angle to the face of 60º-30 º. Rift sawn boards are generally more stable than flat sawn but do not exhibit any quarter sawn patterns.
