This machine is shown in Fig. 102. It is used for sawing along straight or curved lines, and may be used for light or heavy work, according to the size of the saw on the machine. Several saws are provided. They are endless steel bands with teeth along one edge.

Fig. 102. - Band Saw.

Work is placed on the table T. The saw, which is carried on two large rubber-tired wheels, moves through a slit in the table, and is driven by the lower wheel.

For most work, the table T is perpendicular to the path of the saw, but the table may be tilted about the slot as a horizontal axis, for sawing at an angle, and is clamped by the handle P.

To prevent the saw being pushed gradually off the wheels by the pressure of the work against it, the back edge rubs against two guides, the upper of which is carried by a stem H which may be raised or lowered to suit various thicknesses of work, and which is clamped in position by the handle K. The saw is kept taut over both wheels, which are kept in the same plane by the tilting screw M.

It is well to note that the more recent designs of all classes of machines in all shops are provided with guards and protectors to protect workmen from injury. The saw here described is guarded by casing not shown in the figure. Many machines are provided with means for stopping them automatically in case of accident.

Fig. 103. - Hand Planer.