The relation between the secant line and the jaw floor is
To adjust the blade tightness, buttlefly nut rotation should not be too tight or too loose, too tight when the blade force is too large, the cutting force is improper, it is easy to be broken; too loose is easy to twist the saw blade cutting, also easy to break, but saw a saw to skew. The degree of tightness can be turned by hand saw blade, so as to feel hard. The blade after installation, to ensure that the plane of saw blade and the saw bow center plane may tilt and twist, otherwise, when cutting kerf can easily skew.
The blade is installed handsaw cutting in front of the bench, so the blade installation should make the tooth tip direction toward the front, then the rake angle is negative, it can not be normal sawing.
The workpiece clamp on the left, holding the workpiece should be held in a vise for operating the workpiece; protruding jaw should not be too long, should make the left side cutting jaw about 20 mm, to prevent the vibration generated in the workpiece when cutting kerf; lines must keep parallel with the jaw side (the saw strip and the plumb line direction of suture). To control the kerf does not deviate from the crossed lines; clamping firmly, and to avoid the deformation of workpiece clamping and clamping bad machined surface.
