A numerical control drill press drills four 10.0 mm diameter holes at four locations on a flat aluminum plate in a production work cycle. Although the plate is only 12 mm thick, the drill must travel a full 20 mm vertically at each whole location to allow for clearance above the plate and breakthrough of the drill on the underside of the plate. Cutting conditions: speed = 0.4 m/s and feed = 0.10 mm/rev. Whole locations are indicated in the following table:

The drill starts out at point (0, 0) and a return to the same position after the work cycle is completed. Travel rate of the table in moving from one coordinate position to another is 500 mm/min. Owing to effects of acceleration and deceleration, and time required for the control system to achieve final positioning, a time loss of 3 s is experienced at each stopping position of the table. Assume that all moves are made so as to minimize the total cycle time. If loading and unloading the plate take 20 s (total handling time), determine the time required for the work cycle.

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Hole number x-coordinate (mm 25.0 25.0 100.0 100.0 y-coordinate (mm 25.0 100.0 100.0 25.0 4