New types of saws and better blade materials have made metal sawing a much more effective, versatile and economical process. In many cases, bandsaws are used as the primary means of shaping certain types of metal parts. Depending on the thickness or diameter of the work, the number of teeth cutting at one time varies from two to ten or more. Saws may be of the continuous cutting (band or rotary) or reciprocating type.
All saw blades have certain common characteristics and terminology:
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Rake angles: Rake angles are 0 degrees or neutral rake on most saw blades. Some have a positive rake angle.
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Width: The width of a saw blade is its total width, including the teeth.
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Kerf: The kerf is the width of the cut made by the saw blade or the material cut away. The thickness of the blade is called the gage.
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Pitch: The pitch of a saw blade is the distance between the tops of two adjacent teeth. This is specified in teeth per inch.
When the proper sawing machines and blades are used, sawing is one of the most economical means of cutting metal. The saw cut (kerf) is narrow and relatively few chips are produced in making a cut. When a bandsaw is used for cutting the contours of a complex shape only a small portion of the metal is removed in the form of chips. Therefore, only minimal power is used in removing large amounts of waste metal.
In addition to TIR (total indicator runout) is the dimension of the grinding wheel side flutter, runout, roundness and tolerance. This is accomplished by truing, dressing, forming and conditioning.
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