Abstract: An apparatus and method of using a power saw guide for use with a power saw having a sole plate with a fence-following surface spaced a set distance from a sawing plane of the power saw. The power saw guide comprising a long leg and a short leg that are mutually orthogonal legs defining an "L" shape. A permanently attached fence is located along the outer edge of each leg defining a sole-sliding edge to guide the fence-following surface of the saw. Each fence is located on opposite surfaces of the guide Opposite the sole-sliding edge of the fence, is a plank-contact edge that makes contact with plank edge and ensures the cutting of the plank is done perpendicular to the length. An apron gusset extends beyond the intersection of the legs in both mutually orthogonal directions. The apron gusset is aligned with the plank-contact edges of the fences. Since the set distance for each power saw is different, the apron gusset initially has a length that exceeds the set distance.

Abstract: A combination carpenter's square and saw guide, and a conversion kit for converting an existing carpenter's square to such combination, utilizes a standard L-shaped square with a channel mounted on each leg of the square and extended in the same direction so that the channels are each extended in the X or Y direction and are on opposite faces of the flat carpenter's square. A rod is axially slidably inserted into each channel, and the distal end of the rod is extended out beyond the corner of the square a distance equal to the distance between the sole plate of a circular hand saw and the plane of the blade, and fixed in this position. The resulting tool is a carpenter's square which also acts as a convenient saw guide, as the workman can back off the square until the tip of the rod aligns with a pencil mark made at the cut line, and use the square for a saw fence.