Post War
At the end of the war and into the 1950s production stabilized at about 12,000 tons per year with purchased castings at about 3,000 tons per year. The CMM Co. Foundry also produced castings for direct sales to other customers, but at a low rate of about 1,000 tons per year. Because the foundry was wholly owned by CMM, other machine tool makers were reluctant to have their competitor making castings for them. There was also an excess of capacity at Cincinnati local foundries.
The production of castings was similar to the way they were made since the early days of founding. Molding was done with green sand until sometime in the 1960s or 1970’s the furan molding process was adopted for medium and large sized castings. Melting continued using the cupola. Most requirements on the foundry were for gray iron, the material normally used in machine tool castings. With the discovery of Ductile iron, the foundry began producing ductile in the 1950s using open ladle treatments or the Gazal porous plug process. Not many machine tool parts were needed in ductile iron.
Read more about this topic: Foundry Products Operations (Cincinnati Milling Machine)
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