Band saw blades
| Many people don’t realize that the blade in their band saw might not be the best fit. That is, they use band saw blades of incorrect tension for their task. This seemingly small adjustment to a band saw, and its blade, will extend the life of both and result and faster, more accurate cutting.
There are many views about how to best tension band saw blades. However, few of them lead to consistent results and a precise cut. |
Many are led astray by seemingly simple methods, but many also have a reliable tool — a tension meter. Although, not every woodworker uses one. Tension meters can range from $100 to well over $300. These woodworkers may use other methods.
Some suggest that one should pluck the blade like a guitar string and listen for a clear, sustained note. It is certainly true that objects under high tension will sort of “sing” instead of thud. That is part of the reasons that some bridges seem to whistle on a windy day. However, the resonance of various metals (and bi-metals) changes with the amount of tension they possess. Therefore, the method is only reliable if one knows the correct frequency (or tone) to listen for. Hence, while this method might work for more musically inclined woodworkers, it is rather unreliable for those who aren’t sure about what what to listen for.
Similarly, another oft touted method instructs one to adjust the blade until it feels “comfortable.” However, the degree of comfort is rarely specified, and so comfortable might mean very slack or very tight — neither of which is desirable. The vagueness of the statement leads to a broad range of tension, which can mean the difference between an expensive re-cut or, in some cases, a snapped blade. Surely, a more accurate and precise method for setting tension for band saw blades is necessary.
Therefore, the only correct method involves a specialized tool; a tension meter. This tool avoids the inaccuracies of tension scales and eyeballing while providing the necessary level of precision. A tension meter works by clamping on to the blade while it is slack. As the woodworker increases the tension on the blade, the tension meter reports the current level of tension. This shows exactly what is happening to the metal blade, which is useful, safe, and conducive to continued band saw performance.