| 摘要 |
A machine for performing cutting, roll-grooving and like operations on pipe or tubing. A pneumatically operated head assembly provides for rapid tool advancement to a first predetermined position short of work engagement and hydraulically cushioned advancement therefrom to work engagement. A captive oil supply flow freely through poppet valves which close at first predetermined tool position, and at a controllable rate through a needle valve between the first and second tool positions. Automatic poppet reset occurs for rapid tool withdrawal, readying the apparatus for recycling.
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