Comparison of stiffness and frequency characteristics of a Hi-Earn, Detenso, and standard sawblade

Two developments in circular saw design aimed at improving performance are the Detenso and the Hi-Earn saws. Undocumented claims by saw suppliers and sawmillers state that these saws reduce kerf, noise level, and surface roughness, and yield improved cutting accuracy. The purpose of this work was to compare, under controlled conditions, the free running vibration and stiffness characteristics of Detenso, Hi-Earn, and standard sawblades. Experiments were performed with a clamped blade of the Detenso, Hi-Earn, and standard type, made from matched discs. The dynamic flexibility of the blades when loaded by an applied static load, and the critical speed plots for each type of blade were measured and compared. The experimental results showed that there were no significant differences in the dynamic characteristics of the three saws, apart from the slight increase in flexibility of the Detenso saw due to the presence of the slots.

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