Set

The term "set" refers to the way in which the saw teeth are bent or positioned. Set patterns are usually selected depending on the type of material that needs to be cut. Three common set patterns are shown in Figure 39.

Generally, the Raker set is used for cutting metal workpieces; the Wave set, when the thickness of the workpiece changes, such as cutting hollow tubing or structurals. The Straight set is most often preferred when cutting wood or plastics.

Figure 39

Material

Band saw blades can be made from different types of materials. Some of the most common include spring steel, carbon steel, carbon steel equipped with a high speed or welded edge (bi- metal), or carbide tips. A special type of saw blade is made from "high speed steel"; these should not be used on band saws with low rates of speed.

Because of the importance of blade selection, it is recommended that you use the Blade Selection Guide on page 27.

When cutting, do not overfeed the blade; overfeeding will reduce blade life, and may cause the blade to break.

Blade Breakage

Band saw blades are subject to high stresses and breakage may sometimes be unavoidable. However, many factors can be controlled to help prevent most blade breakage. Here are some common causes for breakage:

1.Misalignment of the blade guides

2.Feeding work too fast

3.Using a wide blade to cut a short radius curve

4.Excessive tension

5.Teeth are dull or improperly set

6.Upper guides are set too high off the workpiece

7.Faulty weld on blade

Maintenance

Before any intervention on the machine, disconnect it from the electrical supply by pulling out the plug. Failure to comply may cause serious injury.

Keep bearing guides clean and free of build-up.

Check that the cleaning brush over the band wheel is working properly, and remove any deposits from the band wheels to avoid vibration and blade breakage.

The table surface should be kept clean and free of rust for best results. Some users prefer a paste wax coating. Another option is talcum powder applied with a blackboard eraser rubbed in vigorously once a week; this will fill casting pores and form a moisture barrier. This method provides a table top that is slick and allows rust rings to be easily wiped from the surface. Important also is the fact that talcum powder will not stain wood or mar finishes as wax pickup does.

Do not let saw dust build up in the upper and lower wheel housings. Vacuum out frequently.

Connect the band saw to a JET dust collection system.

Clean and grease the raising/lowering rack for the upper bearing guides if it becomes difficult to raise or lower.

Clean and oil the tensioning mechanism if it becomes difficult to adjust.

Vacuum out the motor fan cover.

26

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Jet Tools 20QT-5, JWBS-18QT, 20QT-3, JWBS-20QT, 18QT-3 operating instructions Maintenance, Blade Breakage
Page 25 Page 27

JWBS-20QT, 18QT-3, JWBS-18QT, 20QT-5, 20QT-3 specifications

Jet Tools has long been recognized as a reliable name in the woodworking and metalworking industries, offering a variety of high-quality tools tailored for both professional craftsmen and enthusiastic hobbyists. Among their product range, the Jet Tools 20QT-3, 20QT-5, JWBS-18QT, 18QT-3, and JWBS-20QT stand out due to their innovative features, technologies, and stellar performance.

The Jet Tools 20QT-3 and 20QT-5 are notable for their robust cast iron construction, ensuring stability and durability while handling heavy workloads. The 20QT-3 model comes equipped with a powerful 2 HP motor, providing ample performance for a variety of applications. It also features a versatile tilting blade system allowing precise angles for your cuts. Meanwhile, the 20QT-5 offers an enhanced motor capacity, boasting a 3 HP motor, further increasing its efficiency and capability in demanding tasks. Both models feature a large capacity of 20 quarts, ideal for extended projects where consistent performance is key.

The JWBS-18QT is another gemstone in Jet's lineup, designed specifically for woodworkers needing precision and control. With an 18-inch throat capacity, it accommodates larger workpieces with ease. Its heavy-duty construction minimizes vibration, leading to more accurate cuts. The JWBS-18QT incorporates Jet’s exclusive blade tracking technology, which ensures optimal blade alignment and reduces wear, improving the lifespan of the blade.

In addition to the 18QT, Jet offers an enhanced version, the JWBS-20QT. This model boasts a superior throat depth of 20 inches, allowing even more versatility for larger projects. It includes advanced features like an easy-to-use quick-release blade tension, making blade changes faster and more convenient, and an integrated dust collection port that helps to keep your workspace clean and free of debris.

The 18QT-3 model focuses on performance in a compact package, providing portability without sacrificing quality. It incorporates a sturdy base and adjustable height settings that allow it to adapt to various work environments, making it an excellent choice for smaller workshops or job sites.

In summary, the Jet Tools 20QT-3, 20QT-5, JWBS-18QT, 18QT-3, and JWBS-20QT represent the pinnacle of woodworking machinery. Their combination of durability, advanced technology, and user-friendly features make them ideal for both professionals and serious enthusiasts looking to achieve exceptional results. With Jet Tools, you can be assured of high performance and reliability in every project.
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