A series of end-milling cuts is currently used to produce an aluminum part that is an aircraft component. The purpose of the machining operation is to remove 94% of the part weight to create a structural frame. A total of 3.5 min is lost during the milling cycle due to tool repositioning. The part has a length = 1.5 m, width = 0.5 m, and thickness = 160 mm. The operation uses a five-tooth indexable-insert end mill with diameter = 36 mm at a cutting speed = 600 m/min, chip load = 0.15 mm/tooth, and average cross-sectional area of cut = 240 mm. High-speed machining has been proposed to replace the conventional milling process. The same chip load and average area of cut will be used, but the cutting speed will be increased to 3600 m/min (Table 21.1), and the time lost for tool repositioning will be reduced to 1.5 min. Determine (a) the cycle time of the current milling operation and (b) the cycle time of the proposed HSM operation. (c) Is this part a good candidate for high-speed machining? Total volume of starting block = Total volume of metal removed = Nc = frc = RMRC Tmc Nn frm = = = RMRh = Tmh= = (10)