Abstract: Procedure and apparatus for sawing a square timber, the apparatus comprising a feed mechanism (1), a chipper (2) and a sawing apparatus (3) in such manner that .the feed mechanism has been arranged to feed the square timber into the chipper, the chipper has been arranged to remove from the square timber its curved surface portions, and the sawing apparatus has been arranged to cut up the spar arriving from the chipper. As taught by the invention, the feed mechanism (1) is connected with a pivot (4) with vertical axis to the chipper, and the chipper is connected with a second pivot (5) with vertical axis to the sawing apparatus which is carried on the frame of the apparatus, and that the apparatus comprises a feed table (6) for feeding the square timber in controlled manner into the feed mechanism.