Abstract: A machine for cutting one or two slots in the sides of a log intended for use as a roofing rafter, the machine including a pair of dado saws, means for moving the saws up and down past the sides of a log, and supports for the saws which are adjustable to coordinate the angle of the cuts with the angle of a previously made notch.

Abstract: A machine for cutting a rectangular mortise in either or both sides of a log intended for building construction, with means for determining accurately the spacing of each mortise from an adjacent end of the log and/or from an adjacent mortise, and the method of operating the machine to effect a plurality of spaced cuts.

Abstract: A cut-off saw assembly for building logs wherein each log is positively advanced to a stop area comprising an array of power actuated stops at varying distances from a cut-off saw, the saw being actuated after the log has been stopped and clamped firmly to a table through which the saw blade is advanced and retracted.

Abstract: A machine for planing and grooving a workpiece, such as a log, in a single pass, comprising a frame, a top grooving cutter adjacent one end of the frame, a top planing cutter and a bottom planing cutter in the frame, and a bottom grooving cutter adjacent the other end of the frame, with feed rolls ahead of the planing cutters, guide vanes in back of each grooving cutter and a back-up roll opposite each planing cutter. Suitable feed and delivery tables are provided, together with preliminary alignment guidance devices including guide pins in the feed table.

Abstract: A building construction element in the form of an insulated wood log with flat planed upper and lower surfaces, a longitudinally extending groove being cut into each surface to a depth about half the thickness of the log, the grooves being on opposite sides of the vertical medial plane of the log, and each groove being filled with a foamed plastic mass having thermal insulating properties substantially equivalent to those of polyurethane plastics.