The top surface of a rectangular work part is machined in aperipheral milling operation. The work part is 735 mm long by 50 mmwide by 95 mm thick. The milling cutter, which is 65 mm in diameterand has five teeth, overhangs the width of the part equally on bothsides. Cutting speed = 60 m/min, chip load = 0.20 mm/tooth, anddepth of cut = 7.5 mm.
(a) Determine the time required to make one pass across thesurface, given that the setup and machine settings provide anapproach distance of 5 mm beforeactual cutting begins and an overtravel distance of 25 mm after actual cutting has finished.
(b) What is the maximum material removal rate during thecut?
(c) If the workpiece has surface scale, would you recommendconventional milling or down milling? Why?
