| 摘要 |
A boring machine having a frame; a shaft mounted for rotational and endward movement on the frame, the shaft having a work end; a boring tool affixed on the work end of the shaft; a work object seat adjustable secured on the frame in substantial axial alignment with the shaft; a cylinder retaining assembly borne by the frame for movement to and from the seat; a motor mounted in the frame in rotationally driving relation to the shaft; and a shaft advancing mechanism secured on the frame in connection with the shaft. |
