Some Engineering Considerations of High-Strain Band Saws

Strength tests of saw steel gave average values of 207,000 psi for the ultimate strength and 179,000 psi for the 0.2 percent yield stress. Sixty three samples of band saw welds gave average values of 137,000 psi for the ultimate strength of 107,000 psi for the 0.2 percent yield stress. Theoretical calculations and experimental measurements both indicate that the sum of the tensile, bending, and centrifugal stresses acting on both normal and high-strain bandmills is approximately 40,000 to 50,000 psi. The importance of an efficient strain system has been stressed and a method was suggested for calculating the strain efficiency. Graphs illustrating the relative effectiveness of changing the strain and the blade geometry in improving lateral stability were presented for both normal and high-strain bandmills. The critical buckling load on the edge of a plate is very nearly proportional to the tensile forces acting on the plate. An equation for predicting the critical edge buckling load in terms of the blade parameter and tensile stress, was presented. Increasing the strain level from 14,900 to either 23,250 or 28,800 pounds on a high-strain bandmill was found to reduce the thickness variation within boards by approximately 1/32 of an inch.

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