To make sure I get the blade speed of the bandsaw:
If the rpm of the motor is, say, 1000, then in one minute the drive wheel achieves 1000*2r*pi. The bandsaw wheel circumference is 2r'*pi, thus the bandsaw wheel achieves 1000*2r*pi/2r'*pi and the blade travels (1000*2r*pi/2r'*pi)/blade length.
Corrections gratefully received.