| 摘要 |
An apparatus comprises a rotating member having one or more rollers. The one or more rollers have a plurality of protuberances. The rollers may be advanced toward a surface during rotation of the rotating member, such as toward a bore surface. The protuberances are configured to make a pattern of discrete indentations in the surface upon engagement of the protuberances with the surface. The apparatus is particularly suited for creating oil-retention pockets in the surface of an engine cylinder and other uses. The apparatus may be used to create a pattern of oil-retention pockets or other pockets in a cylinder with varying pocket density in a single pass.
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