Question

(USCS units) A face milling operation is performed on the top surface of a steel block that is 12.0in long by 2.0 in wide by 2.5 in thick. The milling cutter follows a path that is centered over the width of the block. It has five teeth and a 3.0 in diameter. Cutting speed 250 ft/min, feed 0.006 in/tooth, and depth of cut 0.150 in. Determine (a) machining time and (b) maximum metal removal rate during the cut. (c) If an additional approach distance of 0.5 in is provided at the beginning of the pass (before cutting begins), and an over travel distance is provided at the end of the pass equal to the cutter radius plus 0.5 in, what is the duration of the feed motion?

Fig: 1

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