Band Saw Blade Tension

Tensioning the Blade.

When you install the band saw blade, the first thing to do is put tension on it to hold it on the wheels. Many saws have a gauge that tells how much tension to put on the blade based on its width. In addition, we suggest that you tighten the blade and then pluck it like a guitar string. The blade should produce a clear tone, rather than a dull thud. Next check the blade for deflection. Raise the guide all the way up and then push sideways on the blade. It should not deflect more that 1/4” to 3/8”. The narrow blades will deflect more than wide ones. Some folks recommend that you over tension the blade to correct the saws cutting problems. While it is true that the blades and the saws can stand more tension that the gauges suggest, it is not a good idea to put too much tension on the blades. It can cause the saw’s bearings to fail prematurely. If the saw sits for a long time without use, it can cause flat spots on the tires, which will cause vibration and erratic cuts.