The shaft is smeared with engineer's blue and rotated in the bearing. The two halves of the bearing are then split at the shim, the oil holes cleared of metal and oil ways are cut into the surface of the new bearing. After resealing the ends with clay, more metal is then poured to fill the cap of the pillow block through the hole in the top of the pillow block cap which will eventually be a lubrication hole. Hardened babbitt metal is soft enough to be cut with a knife or sharp chisel.Ī steel shim is inserted to protect the face of the lower bearing and to space the cap of the pillow block away from the shaft. The bearing is stripped, and the metal trimmed back to the top surface of the pillow block. The shaft is coated with soot as a release agent, the ends of the bearing are packed with clay, and molten metal is poured into the cavity around the shaft, initially half filling the pillow block. The inner face of the cast iron pillow block is often drilled to form a key to locate the bearing metal as it is cast into place. In the traditional style of a babbitt metal bearing, a cast iron pillow block is assembled as a loose fit around the shaft, with the shaft in its approximate final position.
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