| 摘要 |
A portable machine tool (10) for preparing pipe or other annular workpiece (12) ends for welding includes a central mandrel shaft (20), a cutting head (14) rotatably mounted on the mandrel shaft and a rotary drive connector (84) on the cutting head arranged to concentrically fit within an annular drive head (66) of modular drive motor unit (64). The drive motor unit is restrained against torque reactive rotation by a torque reaction bar (90) secured to the mandrel shaft so that relative rotation between the drive motor unit and the mandrel shaft is prevented. |
