Abstract: The drill bit (14) passes through a drilling bush (2) for guiding said drill bit. The drilling bush (22) is pressed against the workpiece (10). However, the drilling bush does not terminate flush with the workpiece, but comprises a linear supporting edge (28) that overlaps the apex of the curvature of the workpiece. This prevents the drilling bush from sliding off a curvature of the workpiece surface.

Abstract: The drill bit (14) passes through a drilling bush (2) for guiding said drill bit. The drilling bush (22) is pressed against the workpiece (10). However, the drilling bush does not terminate flush with the workpiece, but comprises a linear supporting edge (28) that overlaps the apex of the curvature of the workpiece. This prevents the drilling bush from sliding off a curvature of the workpiece surface.

Abstract: The machine tool comprises a vertical support (10) with a guide (11) arranged thereon for vertical movement of a workpiece carrier (13) holding a workpiece (15) along an X-axis. Two headstocks (24,30) are each movable along horizontal guides (27,28) in the Y-direction. The guides (27,28) form a frame, with its window (23) closed by a louver provided with passage openings for the headstocks (24,30). This arrangement creates a laterally closed machining chamber which comprises vertical walls and does not present any obstacles to falling chippings. Since the chippings need not be washed off, spray cooling may be used for minimum-quantity lubrication. In this manner, the liquid acting on the chippings is reduced.

Abstract: The machine tool comprises a workpiece carrier (16) into which crankshafts (10, 10a) can be clamped one above the other in horizontal alignment. The workpiece carrier (16) is fixed to a turntable (15) on a horizontal slide (14) with the turntable being pivoted around a vertical axis (A). After the turntable (15) has been brought into an inclined position, the crankshafts (10, 10a) are provided with oblique drill holes by means of the drills (26, 26a). A tool magazine (32) comprises a first circulating magazine (33) for drilling tools and a second circulating magazine (34) for drill bushings (27, 27a). The tools are exchanged between tool magazine (32) and spindle box (24) by means of the pick-up process.