Case Study

Topics: Management, Cast iron, Machining Pages: 2 (530 words) Published: April 18, 2013
The Big “O” Company manufactures large hydraulic units. One of the most difficult items to manufacture is the hydraulic cylinder. The cylinder housing is fabricated from a malleable iron casting. The housing is machined to close tolerances, and the slightest discrepancy in either material or machining means a total loss. Machine cycle time on a typical housing is approximately sixteen hours. For several years, castings had been purchased from the Macon Foundries in Georgia. Macon had been a Big “O” supplier for many years, and during that time it produced thousands of castings at acceptable quality levels. Eight months ago, however, when its founder and president, George Chapel, died, Macon announced that it was discontinuing foundry operations. The supply department at Big “O” undertook a search for new sources. At first, few suppliers could be found who were either capable or willing to meet the exacting specifications and tolerances required. Ultimately, however, three foundries were selected and invited to submit bids on 4,000 castings. The low bidder, at $76.17 a unit, was the Barry Foundry of Muncie, Indiana. Barry was a small concern with a good reputation for doing quality work and fulfilling every delivery promise. Barry was given a purchase order for the full 4,000 units, with the stipulation that Big “O” approve the first 100 units. Within two weeks the first 100 castings were received. They were subjected to initial inspection and then dispatched to the floor for machining. In the words of the shop foreman, “They machined like butter.” Barry was told to proceed with the entire order and a four-month delivery schedule. It was about this time that problems began to develop in the shop. Some hard castings had damaged both grinding wheels and cutting tools. Also, cracks from casting porosity appeared on newly machined surfaces and slots. Although these conditions were not present in all castings, they occurred in a sufficient number...
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