Abstract

The present invention relates to a deep drilling machine including an elongate base, a headstock at one end, a tailstock at the other end, each of the headstock and tailstock being shiftable axially of the base by drive device interposed between the base and each of the headstock and tailstock. A coolant supply apparatus having a chuck member is interposed between the headstock and tailstock at a central position along the base. Devices are provided for enabling the chuck member of the coolant supply devices selectively to face the headstock or the tailstock as desired. The chuck of the headstock is provided with drive device. By the foregoing arrangement a chuck member may be oriented toward the headstock or the tailstock whereby the device may be set up such that either the workpiece or the drilling tool is rotated without the necessity for providing drive device at both the headstock and tailstock ends of the device. Preferably the chuck member is provided with a preload of a hydraulic or spring nature which enables limited axial movement of the chuck member against the preload force.