1. Chipping and sawing machine for cutting a log comprising a frame, chipping means including chipping members rotatably journalled thereon for cutting the oppositely disposed side portions of the log into chips so that the two opposite sides of the log are provided with planar surfaces disposed parallel to each other, sawing members for sawing at least one board from each planar side of the log, and driving means for the chipping and sawing members, wherein the improvement comprises that said sawing members are located following said chipping means so that the log is still guided by said chipping means when the sawing operation is commenced for avoiding warping, twisting or bending in the log in consequence of the variations in inner tensions in the log caused by the chipping operation, conveying means arranged for advancing the log to said chipping member and between said chipping members and said sawing members, said chipping means includes guides, said chipping members are truncated cones spaced apart having The smaller ends thereof facing each other, said driving means for said cones are rotatable about an axis transverse to the direction of movement of the log on said conveying means, each of said cones having a plurality of knives spaced axially and radially with each said knife having a first edge line disposed to operate in a first plane containing the grains of the log and a second edge line merging with said first edge line disposed in a second plane intersecting said first plane to cut across the grains, and each of said guides is associated with a different one of said chipping members and is positioned between the associated said chipping member and said sawing members and extends from a point adjacent the smaller end of said chipping member to a point beyond the leading edge of said sawing member for guiding one of the two opposite sides of said log provided with planar surfaces between said chipping member and said sawing members.