| 摘要 |
A combination of two or more jaw assemblies for mounting onto a self-centering power chuck to move an irregular workpiece to the axial centerline of the power chuck after it has been clamped. Each jaw assembly has a independent hydraulic system which, when activated, reduces the length of the jaw assembly, thereby moving the workpiece clamped in the power chuck. The imperfect pipe's average centerline can be moved to any location within the combined adjustable range of all the jaw assemblies. Each jaw assembly consists of a base jaw that is affixed to the power chuck, a connecting block that moves when the hydraulic system is actuated, a piston, a cylinder, and an interchangeable swivel insert with a serrated gripping surface.
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