Unit to tap bores in sheet or plate

摘要

The machine tool (1) for tapping screw thread in pre-drilled bores in a workpiece (W) comprises a base (3) with column on which a carrier (13) is horizontally swivellable and provided with tapping (15) units (17) arranged at equal radial distance from the swivel axis. A table (5) horizontally movable (41) on the base towards and away from the column carries a cross-slide (59) which is movable (73, 75) at right angles to the table and provided with work clamps (63).The respective drives (41; 73, 75) can be uncoupled to permit manual movements in the two directions and means (53, 85, pinions meshing with tooth racks) are provided to measure the position of the cross-slide