Jet Tools JWBS-18X-3 operating instructions Resawing, Saw Blade Selection

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Resawing

Resawing is the process of slicing stock to reduce its thickness, or to produce boards that are thinner than the original workpiece. Figure 33 demonstrates resawing.

The ideal blade for resawing is the widest one the machine can handle, as the wider the blade the better it can hold a straight line.

When resawing thin stock, use a push block, push stick, or similar device to keep your hands away from the blade.

the tip of the tooth. Generally, wider blades are used for ripping or making straight cuts; narrower blades are often used when the part being cut has curves with small radii. When cutting straight lines with a narrow blade, the blade may have a tendency to wander, causing blade lead. (refer to the Blade Lead section in Adjustments).

Pitch

Pitch is measured in "teeth per inch" (TPI). Figure 34 shows blades with different pitches. A fine pitch (more teeth per inch) will cut slower but smoother. A coarse pitch (fewer teeth per inch) will cut rougher but faster. As a rule of thumb, the thicker the workpiece, the coarser will be the blade pitch. If you have to cut a hard or very brittle material, you will probably want to use a blade with a finer pitch in order to get good clean cuts.

General rule: Use a blade that will have no fewer than 6 and no more than 12 teeth in the workpiece at any given time.

Figure 33

Saw Blade Selection

Using the proper blade for the job will increase the operating efficiency of your band saw, help reduce necessary saw maintenance, and improve your productivity. Thus, it is important to follow certain guidelines when selecting a saw blade.

Here are factors to consider when selecting a blade:

ˆThe type of material you will be cutting.

ˆThe thickness of the workpiece or part.

ˆThe features of the workpiece or part, such as bends or curves with small radii.

These factors are important because they involve basic concepts of saw blade design. There are five (5) blade features that are normally changed to meet certain kinds of sawing requirements. They are:

1.width

2.pitch (number of teeth per inch),

3.tooth form (or shape),

4.the "set" of the teeth

5.the blade material itself.

Width

Band saw blades come in different standard widths, measured from the back of the blade to

Figure 34

Shape

Figure 35 shows common types of tooth shape. Tooth shape has an effect on cutting rate, and with few exceptions, the Skip and Hook types are used to obtain higher feed rates when cutting thick workpieces. Variable-tooth blades are also available, which combine features of the other styles.

Figure 35

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Contents Band Saw More Information WMH Tool Group Warranty WarrantyTable of Contents Page Page JWBS-18X Introduction SpecificationsVolt Operation HP Single Phase MotorGrounding Instructions Feet Extension cordsUnpacking Contents of Shipping ContainerMounting the Table AssemblyRail Assembly HandwheelAssembling the Fence to Fence Body Fence Assembly and AdjustmentFence Adjustment Miter Gauge Resaw GuideAdjusting 90 Degree Table Stop AdjustmentsInstalling/Changing Blades Blade Tracking Blade TensionUpper Bearing Adjustments Overview Bearing AdjustmentsGuide Gearings Adjustment Lower Bearing AdjustmentsBlade Lead Belt Tension Replacing the V-BeltPulley Alignment Electrical ConnectionsCrosscutting General ProcedureOperation RippingSaw Blade Selection ResawingBlade Breakage MaintenanceBlade Selection Guide Trouble TroubleshootingReplacement Parts Optional Accessories Band Saw BladesIndex No. Part No Description Size Qty Parts List Upper Wheel AssemblyUpper Wheel Assembly JWBS18X-MFC Parts List Lower Wheel and Motor AssemblyLower Wheel and Motor Assembly Parts List Blade Guide Assembly JWBS18DX-357 Blade Guide Assembly Parts List Table and Fence Assembly 16-18x2 Table and Fence Assembly Electrical Connections Page WMH Tool Group