Patent ID: 7836806

Claim:
A cut alignment device for a rotary saw having a motor which spins a cutting unit, the cutting unit including a rotary shaft driven by the motor, and a circular blade having a central aperture through which the rotary shaft fits, the circular blade having a flat surface that is transected by the central aperture and wherein the flat surface lies in a plane of the circular blade, the cut alignment device comprising: a structural housing; a battery power source located within the structural housing; and a light source, operatively connected to the battery power source, and located within the structural housing; wherein the structural housing is mounted on the rotary shaft, and wherein the light source projects a light beam from the structural housing directed slightly away from the plane of the circular blade at a positive angle such that the light beam is not parallel to the plane of the circular blade and never intersects the plane of the circular blade, to assist an operator in cutting accurately.