| 摘要 |
<p>The workhead includes a spindle (4) disposed on a base member (5) and rotatable about a rotational axis. The spindle includes a chuck (52) for fixedly clamping one end of an elongated workpart (W), such as a valve lifter body, having a bore between opposite ends with the longitudinal axis of the bore substantially coaxial with the rotational axis. A fluid bearing (6) such as a hydrostatic bearing (170) is disposed on the base member (5) adjacent the other end of the workpart (W) for providing pressurized fluid at sufficient locations around the other end to resist machining forces tending to deflect the other end off axis relative to the fixedly clamped end during machining of the bore to improve bore roundness and straightness.</p> |
