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Time left 0:39:38 A tapered surface is turned on an automatic lathe. The workpiece is 550 mm long with minimum and maximum diameters of 120 mm and 200 mm at opposite ends. Automatic controls on the lathe permit the surface speed to be maintained at a constant value of 150 m/min by adjusting the rotational speed as a function of workpiece diameter. Feed = 0.25 mm/rev, and depth of cut = 3.0 mm. The approximate geometry of the piece has already been formed, and this operation will be the final cut. Determine a) What are differences between automatic and engine lathe (name the main parts). (20 Points) b) the time required to turn the taper (15 Points) c) the rotational speeds at the beginning and end of the cut (assume cutting starts at the smaller diameter) (15 Points)