Abstract: The present invention relates to a mechanical control head for guiding the movement of a tool and particularly an electrode for electroerosion by means of a control rod with a forked end. The control has the following elements in combination: (a) a connection of the tool on a support terminating in a foot in the form of a spatula with tapered edge; (b) an articulated, centered connection of the foot in the forked end of a control rod, said rod presenting an annular shoulder spaced from the spatula-shaped foot and adapted to rotate about its axis and move in the axial direction; (c) a coaxial assembly of a hollow guide prism whose guide face, in contact with the tapered edge of the spatula-shaped foot, is cut obliquely, while the opposite face of the prism, perpendicular to the axis of the prism, rests on the shoulder of the control rod.

Abstract: An apparatus for electroerosion within a solid component which includes a hollow stationary cylinder, a control rod surrounded by and coaxial with the cylinder, a driving square terminating one end of the rod and an electrode connected to said driving square. The electrode is pivotable around an axis perpendicular to the axis of the cylinder, movable together with the rod along the axis of the cylinder, positionable perpendicular to the axis of the cylinder and rotatable around the axis. The method comprises machining a pilot channel in the solid component having a cross-sectional identical with the aperture cross-section of the proposed cavity, introducing an electrode into the channel, moving the electrode relative to the solid component and removing material from the cavity so formed in the solid component.