High power flat saw with blade shaft drive

A high power flat saw having a large diameter saw blade, said flat saw comprising a motor and a blade shaft drive, wherein said blade shaft drive comprises a first pulley and a second pulley and a belt, said second pulley being directly connected to a blade shaft, said first pulley having a smaller diameter than a diameter of said second pulley, and wherein said blade shaft drive further comprises a variable belt tensioner arranged to apply a variable force to said belt

• wherein the first pulley is directly connected to a power take out shaft being an extension of a crankshaft/rotor of said motor, wherein said first and said second pulleys are directly rotationally connected by the belt, wherein the belt is a low profile belt, and wherein the dynamic belt tensioner of the blade shaft drive comprises a resilient member, said belt tensioner further comprises a rotatable idler pulley for contact with the belt and a pivot arm connecting the idler pulley to the resilient member.