Setting tension on band saw blade
Lonnie Bird suggest that one can learn to set proper tension on a band saw by putting moderate pressure sideways to deflect it 1/4″ sideways held between guides set 6″ apart. It would seem to me that one could be very precise by putting something like a pull fish weight scale on the blade and tugging so many pounds sideways. It seems to me it is a matter of mathematics and vectors. Not sure if it would be something like the sin or tangent of 5 degrees (based on the geometry of the deflection) times the desired pounds per force you are trying to achieve. Wait. The idea is simple if the math clouds the head.
If you want to exert a force of 200 pounds on a 3/8″ blade, how many pounds do you need to pull on it to get it to deflect 1/4″ I would think there would be charts. A tool to measure this (a fish scale) would be a lot cheaper than a strain gauge and in theory, just as accurate.
If I use my math model to get a 3/8″ blade under 20,000 psi, roughly 200 pounds of tension to deflect 1/4″ requires 16 pounds of force sideways. This seems on the surface more than “moderate pressure” but maybe I under estimate my strength. It is the method I’m interested in than the rightness of the math