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 white metal bearing, a cast iron pillow block is assembled as a loose fit around the shaft, with the shaft in approximately its final position. ![]() As the bearing wears the harder crystal is exposed, with the matrix eroding somewhat to provide a path for the lubricant between the high spots that provide the actual bearing surface. The structure of the alloy is made up of small hard crystals dispersed in a matrix of softer alloy. Originally used as a cast in place bulk bearing material, it is now more commonly used as a thin surface layer in a complex, multi metal structure.īabbitt metal is soft and easily damaged, and seems at first sight an unlikely candidate for a bearing surface, but this appearance is deceptive. Babbit metal is characterized by its resistance to galling. The term is used today to describe a series of alloys used as a bearing metal. It was invented in 1839 by Isaac Babbitt in Taunton, Massachusetts, USA. ![]() Babbitt metal, also called white metal, is an alloy used to provide the bearing surface in a plain bearing.
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