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Daily Archives: September 22, 2014

Prolonging Bandsaw Blade Life

Prolonging bandsaw blade life is an obvious topic of discussion, but there are ways to avoid such occurrences as weld breakage, premature blade dulling, and blade bounce from cropping up to affect work production, output, and cost. When such instances occur, a few questions to ask include: was the blade tension set properly, was the correct blade used for the size and type of material being cut, and/or, was the proper break-in procedure followed prior to cutting? The blame may lean toward low blade quality, but more often it is due to improper use. Before operating a machine, it is …

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Bandsaw Blades and Tension

Bandsaw blades and tension; tension required in order to consistently produce a more accurate and straight cut, especially when machining dense or thick materials. Each saw blade for each specific job will require its own form of tensioning. For example, a carbon blade requires a tension of around 15,000 – 20,000 psi. Bi-metal blades require a higher tension. Why do bandsaw blades require so much tension? Proper blade tension allows for greater beam strength, and all bandsaw blades — regardless of their width — require the same amount of tension for maximum beam strength. The tighter the blade is stretched, …

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Bandsaw Feed Systems

Bandsaw Feed Systems are the pressures applied to the bandsaw blade by the materials that are being cut. Feed Rate is an important cutting variable that is defined as being the amount of material (in square inches) that the saw is set to cut in one minute, S.I.P.M. (Square Inches Per Minute). The feed system should not be erratic, and the bandsaw movement should be smooth and steady. Different Methods of Feed System Gravity — the bandsaw falls under the head’s weight and has movable weight which allows for adjustment of the feed pressure Gravity/Spring — similar to gravity feed, but with the use …

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The Three-Tooth Rule

The Three-Tooth Rule, or How the Number of Teeth Work in a Cut. In order to obtain the best TPI (teeth per inch) for the smoothest cut, follow the three-tooth rule. A minimum of three and a maximum of 24 teeth engaged in a cut. If there are too few teeth in a cut, the blade’s teeth can straddle the work piece and cause the teeth to strip. Too many teeth in a cut may cause the gullets to overload due to there not being enough gullet capacity to hold all of the chips. Along with having teeth strip from the saw blade, blade bounce is …

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Bandsaw Blade Gullets

Bandsaw blade gullets are the space or curvature between each individual tooth on a saw blade. With each pass of the blade, the material being cut will curl into the gullet, creating a spiral of material called the chip. Too many teeth in the cut will make the gullet full. The teeth become filled with this excess material, and the chip will eventually break away. Use a variable pitch blade since the alternating pitch created increases and then decreases the chip load inside the cut. One reason to pay attention to gullet size is that with coarser pitch blades, the …

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Chip Formation and Color

There are various factors that can affect bandsaw efficiency, and using the correct sawing parameters — band speed and feed rates — is one to consider. Knowing about chip formation and color is important to determine the correct use of feed rate. A bandsaw blade’s teeth are razor-sharp, and the result of any cutting process includes the chips produced. They are discarded yet hold a vital clue to the success of any cutting procedure. The bandsaw operator can and should inspect the chips in order to achieve maximum cutting efficiency. Chips are the layers (shavings) of metal removed from the material being cut as …

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How to Determine Bandsaw Blade Size

When trying to figure out how to determine bandsaw blade size, it is important to know the job that will be performed using that particular saw blade. Things like material, amount, and cut. To help determine the proper bandsaw blade size for a particular machine, follow this formula: For two-wheel bandsaws Adjust the wheels to their correct position (about the middle of the adjustment range) make sure the wheels are not adjusted to the extreme Allow for take-up to tension the band and for possible future blade re-welding. The middle of the adjustment range is best Band length = (R1 x …

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Bandsaw Definitions

Bandsaw Definitions and what you should know with regard to the jargon tossed about within the industry. As a child, I grew up believing that a BLT was a Club sandwich. My mother always called them Clubs and who was I to argue? Imagine my shock and dismay at ordering a Club Sandwich as an adult only to have the waitress set a turkey sandwich before me. I hate turkey. Industry jargon is no less confusing and muddled. This unique form of speaking or labeling certain aspects of the field, like most words in the English language, tend to branch out …

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