re: band saw riser block question

I think you’re seeing the spine of the saw flex when there’s friction on the blade in a turn. I’ve tried a riser block on a 14" band saw and the blade cupped in the cut due to the blade tension dropping. It doesn’t matter how high the tension is to begin. The spine stiffness on a modern Delta style band saw is marginal to begin with. Add 6" to the height of the wheel and it is much easier to flex..like adding 6" to a lever.

I ended up selling my 14" BS and bought a 10" for curves and a 20" for ripping rough lumber and resawing. One of the better equipment decisions I’ve made.