| 摘要 |
A self-centering and aligning attachment assembly for attaching a portable align boring machine to a workpiece or associated support for machining a bore in the workpiece includes first and second attachment sub-assemblies. The a first attachment sub-assembly has a first tubular member through which the boring bar can pass and which is securable to the boring machine. The second attachment sub-assembly has a second tubular member through which the boring bar can pass, and which is securable to the workpiece or associated support with an inner bearing member in alignment with the bore in the workpiece to be machined. A collar member of the first attachment sub-assembly is securable to the second tubular member of the second attachment sub-assembly to enable the boring machine with the first attachment sub-assembly secured thereto to be secured to the second attachment sub-assembly after the second attachment sub-assembly has been secured to the workpiece or associated support and aligned with the bore in the workpiece, an outer bearing member of the first attachment sub-assembly and a co-operating inner bearing member of the second attachment sub-assembly being self-centering. |
