Jet JWBS-18QT Operating Instructions And Parts Manual

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Jet JWBS-18QT Operating Instructions And Parts Manual Manual pdf 25 page image

25ResawingResawing is the process of slicing stock toreduce its thickness, or to produce boards thatare thinner than the original workpiece.Figure 36 demonstrates resawing.The ideal blade for resawing is the widest onethe machine can handle, as the wider the bladethe better it can hold a straight line.When resawing thin stock, use a push block,push stick, or similar device to keep your handsaway from the blade.Figure 36Saw Blade SelectionUsing the proper blade for the job will increasethe operating efficiency of your band saw, helpreduce necessary saw maintenance, andimprove your productivity. Thus, it is important tofollow certain guidelines when selecting a sawblade.Here are factors to consider when selecting ablade:! The type of material you will be cutting.! The thickness of the workpiece or part.! The features of the workpiece or part,such as bends or curves with small radii.These factors are important because theyinvolve basic concepts of saw blade design.There are five (5) blade features that arenormally changed to meet certain kinds ofsawing requirements. They are:1. width2. pitch (number of teeth per inch),3. tooth form (or shape),4. the "set" of the teeth5. the blade material itself.WidthBand saw blades come in different standardwidths, measured from the back of the blade tothe tip of the tooth. Generally, wider blades areused for ripping or making straight cuts;narrower blades are often used when the partbeing cut has curves with small radii. Whencutting straight lines with a narrow blade, theblade may have a tendency to wander, causingblade lead. (refer to the Blade Lead section inAdjustments).PitchPitch is measured in "teeth per inch" (TPI).Figure 37 shows blades with different pitches. Afine pitch (more teeth per inch) will cut slowerbut smoother. A coarse pitch (fewer teeth perinch) will cut rougher but faster. As a rule ofthumb, the thicker the workpiece, the coarserwill be the blade pitch. If you have to cut a hardor very brittle material, you will probably want touse a blade with a finer pitch in order to getgood clean cuts.General rule: Use a blade that will have nofewer than 6 and no more than 12 teeth in theworkpiece at any given time.Figure 37ShapeFigure 38 shows common types of tooth shape.Tooth shape has an effect on cutting rate, andwith few exceptions, the Skip and Hook typesare used to obtain higher feed rates whencutting thick workpieces. Variable-tooth bladesare also available, which combine features ofthe other styles.Figure 38