Technical Information Band SawsBlade Basics (continued) Tooth Selection Tooth selection is based on the principle that there is a tooth pitch best suited for the cutting job. Blade selections should be based on the size, shape, accuracy, materials, and cutting rate expected. The chart below will help you select the correct pitch for cutting solids, tubes, and structurals. Keep in mind these numbers: 3, 6, 12, and 24. There should be a minimum of three teeth in the work at all times for bi-metal bands. Ideally, 6-12 teeth should be in contact with the work; 24 teeth in the work is too many. Solids StructuralTubing Cross-sectionPitchCross-sectionPitchWall ThicknessPitch 1/4" 10/14 TPI 14 TPI 1/4" - 1/2" 10/14 TPI 10 TPI 8/12 TPI 1/4" - 1/2" 10 TPI 10/14 TPI 8/12 TPI 3/8" - 3/4" 8/12 TPI 10 TPI 8 TPI 3/4"-1-1/2" 4/6 TPI 6 TPI 5/8 TPI 1/2" - 3/4" 8 TPI 6/10 TPI 5/8 TPI 1/2" - 3/4" 8 TPI 6/10 TPI 5/8 TPI 1-1/2" - 3" 4/6 TPI 4 TPI 3/4 TPI 3" - 6" 2/3 TPI 3/4 TPI 3 TPI 3/4" - 1" 4/6 TPI 5/8 TPI 6 TPI 3/4" - 1" 4/6 TPI 6/10 TPI 6 TPI 6" - 10" 2 TPI 2/3 TPI 10" - 14" .75 TPI .8/1.5 TPI Tech Tip Feed Pressure Chips tell you what is happening with your feed pressure and your blade. Powdery or fine chips indicate not enough feed pressure is being applied. Loosely curled chips tell you everything is going well. Heavy or thick / blue burned chips mean you are pushing the blade to hard, creating too much heat and load for the teeth. If a change in feed or speed rates is required, change one at a time and observe the results after each change. Correct Loosely Curled Chip Correct feed, speed Tips On Band Saw Cutting Machine Checklist ___ The blade tension on the tension meter. ___ The performance of the chip brush. ___ The wear and alignment of the blade guides. ___ The band speed with a tachometer. ___ The cutting fluid concentration with a refractometer. Cutting Fluid The cutting fluid keeps the blade teeth cool; it prevents the chips from welding to the teeth; it also lubricates the chips, allowing them to move through the cut. ___ Use a high quality cutting fluid. ___ Make sure the cutting fluid is distributed throughout the cut. Incorrect Heavy, thick, blue chips Reduce feed, speed Thin or powdery chips Increase feed, speed
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