Resultant Force and Surface Quality from Some Face-Milling Variables

Although face milling is a versatile metal-cutting process, it has not been widely applied to woodcutting. To determine the effects of several variables on cutting force and surface quality, samples of yellow-poplar, sugar maple, and red oak at 8 percent moisture content were face milled with three cutterhead diameters (10, 12, and 16 in.), three chamfer angles (22-1/2?, 45?, and 67-1/2?), and three down-milling feed positions. The three feed positions and radial rake angle were changed proportionately for each diameter cutterhead so that the exit angle between the face-cutting edge and exit edge of the surface was approximately the same for all cutting combinations. One knife was mounted on the experimental face mill and turned at 25 rpm. The face-milled surface was 7/8 inch by 12 inches and feed rate was 30 inches per minute. The oblique rake angle was 52-1/2? and the depth was 0.015 inch. The resultant cutting force was determined from the work-piece force components measured with a workpiece transducer, and maximum surface defect was measured from profiles traced with a stylus. The results showed that, for the range of variables tested, face-milling combinations had little effect on cutting force and depth of defect. Thus, face milling could be used to surface wood under any conditions.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member