8 - Chapter 6 - TC 9-524 Chapter 6 SAWING MACHINES GENERAL...

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TC 9-524 PURPOSE The sawing machine is a machine Chapter 6 SAWING MACHINES GENERAL TYPES tool designed to cut The power hacksaw and the bandsaw are two common types material to a desired length or contour. It functions by of sawing machines used to cut metal in the machine shop. drawing a blade containing cutting teeth through the The power hacksaw uses a reciprocating (back and forth) workpiece. The sawing machine is faster and easier than hand cutting action similar to the one used in a hand hacksaw. The sawing and is used principally to produce an accurate square power hacksaw is used for square or angle cutting of stock. or mitered cut on the workpiece. The band saw uses a continuous band blade. A drive wheel and an idler wheel support and drive the blade. POWER HACKSAW MACHINES DESCRIPTION All power hacksaw machines are basically similar in design. Figure 6-1 shows a typical power hacksaw and identifies its main parts, which are discussed below. Base The base of the saw usually contains a coolant reservoir and a pump for conveying the coolant to the work. The reservoir contains baffles which cause the chips to settle to the bottom of the tank. A table which supports the vise and the metal being sawed is located on top of the base and is usually referred to as part of the base. Vise The vise is adjustable so that various sizes and shapes of metal may be held. On some machines the vise may be swiveled so that stock may be sawed at an angle. The size of a power hacksaw is determined by the largest piece of metal that can be held in the vise and sawed. Frame The frame of the saw supports and carries the hacksaw blade. The machine is designed so that the saw blade contacts the work only on the cutting stroke. This. action prevents unnecessary wear on the saw blade. The cutting stroke is on the draw or back stroke. 6-1
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TC 9-524 Some machines feed by gravity, the saw frame having weights that can be shifted to give greater or less pressure on the blade. Other machines are power fed with the feed being adjustable. On these machines, the feed is usually stopped or reduced automatically when a hard spot is encountered in the material, thus allowing the blade to cut through the hard spot without breaking. SPEED-CHANGE MECHANISM The shift lever allows the number of strokes per minute to be changed so that a variety of metals may be sawed at the proper speeds. Some saws have a diagram showing the number of strokes per minute when the shift lever is in BANDSAW MACHINES Metal-cutting bandsaw machines fall into two basic categories: vertical machines (Figure 6-2) and horizontal machines (Figure 6-3). Band saws use a continuous saw blade. Chip removal is rapid, because each tooth is a precision cutting tool and accuracy can be held to close tolerances eliminating or minimizing many secondary machining operations.
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This note was uploaded on 10/26/2010 for the course ENGINEERIN MECH221 taught by Professor Wetton during the Spring '10 term at UBC.

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8 - Chapter 6 - TC 9-524 Chapter 6 SAWING MACHINES GENERAL...

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