One of my complaints about band saws in general is the way they tell you how much tension to put on the blade. Ever BS that I have seen has an indicator that tells you, based on blade size, how far to move the block that compresses the spring. They are notoriously inaccurate.
Almost all BS blades should be tensioned to around 20,000 p.s.i.. The best way to measure this is to measure how much the blade has stretched. I own a tension gauge that takes that measurement and you really need one if you want to accurately set your tension.
It is my opinion that measuring the movement of the upper wheel could be a good proxy for measuring the actual stretch of the blade. I envision a sensor at the top of the upper wheel that, once calibrated, could measure wheel movement and translate that into a more accurate measure of blade tension. If this sensor measured the actual blade position (instead of wheel position) you would automatically compensate for any tire compression.
While they are incorporating this concept into a future band saw they could also add a servo motor for applying pressure to the blade. With the servo motor I could even envision automatic blade tensioning at the push of a button. Now that would be cool.
Are you manufactures reading this?
-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.