This takes the roll turner one to two hours, depending on the roll's size, the amount of wear, and how deep it has to be cut. These 150 are divided into three sets. While one set is on the mill, another set is on standby and ready for rolling, and the remaining set is rehabbed. Keystone also has a bearing program at its rolling mill. A failure results in heat and smoke and causes a mill to shut down.
Workers index each bearing as it is replaced so that the load centers are rotated.
This helps reduce wear. Bearings are inspected regularly. Keystone uses Timken bearings on stands 1-15. Stands 24 and 25 are changed every shift to shift and a half, depending on the quality of rod running at the time. Keystone makes rod from .219 to .594 inch in diameter.