Magnetic controller for acme measurement of the band saw blade transverse deflected shape

The device is intended to measure the acme of the transverse deflected shape of band saw blades, tensioned by a specific cold rolling process in sawmill filing rooms. A critical analysis of conventional measurements of residual stresses in the blade and a description of the new magnetic controller are given. By the new controller, unlike the conventional light gap method the measurement is taken by bending the blade over a radius equal to the one of the pulley to be used in the actual sawing operation. The new controller gives numerical values for the acme of the transverse deflected shape, being convenient for comparisons and for formulating instructions for the working practice. A short survey of the mathematical treatment of the problem and a part of expenmental results are also given.