Patent ID: 8752256

Claim:
A process for preparing a surface of a cylindrical bore for application of a sprayed layer comprising: forming a series of circumferentially-oriented alternating grooves and webs in the surface; and operating a rotary brush to plastically deform the webs, the brush having a central shaft and at least one wire having a base end mounted for rotation about an axis parallel with and radially offset from the central shaft such that an entire length of the wire is rotatable about the axis, the wire having a length such that an outside diameter of the rotary brush is less than an inner diameter of the cylindrical bore, and operation of the brush comprising: positioning the central shaft parallel with and offset from a central axis of the cylindrical bore; rotating the brush about the central shaft such that the wire strikes a circumferential sector of the bore surface, is pulled along the sector, and then lifts off from the surface; and moving the central axis in a circular pattern within the cylindrical bore to maintain a constant distance from the bore surface, such that the bore surface is contacted around its full circumference.