How to use the hand saw correctly?

Answer: Install hacksaw bars according to different shapes and materials of hacksaws. Usually, the serrations of the hacksaw bar face the front end of the hacksaw. The installation direction of the saw blade is the front where the tooth tip is pushed out of the saw. In this way, when the saw is pushed forward, the sawtooth can cut into the curved edge of the workpiece, because it is difficult to cut if the hypotenuse makes a large negative angle with the front cutting edge. However, when sawing a thin workpiece, if there is no saw blade with fine teeth, especially when the thickness of the sawed workpiece is close to or less than the distance between two serrations, the saw blade can be installed backwards, that is, the serrations are backward, so that the plate can be sawed smoothly.