11. Consider a milling operation of unidirectional CFRP with a cutter diameter of 20 mm, and one cutting edge on the cutter. The cutter speed is 1,000 rpm, the feed speed is 100 mm/rev, and the depth of cut is 2 mm. The thickness of the workpiece is 4.0 mm. A schematic of the cutting configuration is shown below. 62 62 Fibers Fx N 2 Conventional Machining Operations D 100 mm/rev 2 mm Fy (a) Determine the total engagement angle ox. (b) Determine the instantaneous fiber orientation angle 0, which is the angle between the fibers and the cutting velocity vector, as a function of the instantaneous engagement angle o. Evaluate the fiber orientation angle for an instant that is halfway between entry and exit of the cutting edge.