Effect of Cutting Speed During Thick Slicing of Wood

Slices 1/2- and 1-inch-thick of red oak, southern pine, and yellow-poplar were cut at 5, 50, 200, and 500 fpm using a special experimental cutting machine. Cutting was done at 190?F., with compression and restraint applied by a conventional pressure bar. Physical damage, thickness variation, and forces were measured. The depth of knife-side fractures increased as speed increased from 5 to 500 fpm. The depths ranged from 32 percent for 1/2-inch red oak and yellow-poplar to 82 percent for 1-inch southern pine. No relation between thickness uniformity and speed was found. Little difference was shown between species with the average change in thickness of 0.016 inch for 1/2-inch-thick and 0.031-inch for 1-inchthick material. Maximum parallel and perpendicular knife forces were 291 and 454, and on the bar 239 and 858 lbs. per inch of length. Net cutting power ranged from 0.03 to 8.01 horsepower per inch of length.

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