Peripheral Milling Across the Grain with Rake Angles Up to 60 Degrees

Panels of yellow-poplar, red oak, and sugar maple conditioned at 8 percent moisture content were up-milled and down-milled across the grain with rake angles of 37?, 45?, 52?, and 60? at 10 knife marks per inch and 1/16-inch depth of cut. Surface quality was essentially the same for all rake angles and generally better than a surface prepared by abrasive planing with a No. 36 grit. The flakes from knife planing across the grain with high rake angles may be more suitable for use in particleboard than conventional planer shavings or sanding dust. Planing across the grain with high rake angles used half as much power as conventional knife planing and one-tenth as much power as abrasive planing.

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