| 摘要 |
<p>The lathe comprises a split-ring assembly, including a clamping ring that is positioned about the pipe, and journalled to the clamping ring is a rotatable gear ring that supports a tool block carrying a cutting tool. The bearing arrangement is used to journal the gear ring to the stationary clamping ring. One face of the gear ring includes an annular groove whose side walls define a bearing race. The race is dimensioned to receive a number of roller bearings, the roller bearings being affixed to a planar surface of the clamping gear in a circumferential arrangement so as to fit into the bearing race when the gear ring is coupled to the clamping ring.</p> |
