| 摘要 |
A drill spindle (62) is carried by the forward end of an elongated gear housing (12, 14). A parallel drive shaft (84) is carried by the housing (12, 14) rearwardly of the spindle (62). A parallel lead screw (92) is positioned between the spindle (62) and drive shaft (84) and is attached to a workpiece-engaging foot (20). A plurality of gears transmit rotation of the drive shaft (84) to the spindle (62) and lead screw (92). Two leader pins (182) are attached to the foot (20) and engaged by bearings (186) carried by the housing (12, 14) to slide freely relative thereto and to provide stiffness between the housing (12, 14) and the foot (20). The leader pins are spaced laterally and rearwardly from the drive shaft (84). A fluid activated pusher member (30) cooperates with the foot (20) to wedge the forward end of the drill (10) in a recessed work area. A fluid operated dog clutch (124, 132) engages rotation of the lead screw (92). Coolant may be provided through a flat profile inducer (18) and axial passages in the spindle (62) and bit (74).
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