| 摘要 |
An apparatus and method for accurately grinding the outer circumferential face of the spigot of a bell, and spigot type member, such as a concrete pipe or manhole riser on one side of the spigot, while simultaneously cutting a sealing ring groove in that face on the opposite side of the spigot provides for advancing a support base and rotatable main arm assembly toward the end face of the member while automatically centering the support base on the outer circumferential face, then clamping in the centered position. A motor driven grinding assembly, on one side of the main arm assembly, and a motor driven cutter assembly, on the opposite side thereof, are then moved inwardly into contact with the spigot face, and the main arm assembly rotated in an annular path around the support base and member to grind a true truncated conical face on the spigot while the cutter forms an accurate sealing groove in that face for an O ring, or other seal. The centering is accomplished by opposite slave cylinders and pistons under control of a master cylinder, and the clamping is accomplished by a plurality of cylinder and piston devices.
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