Abstract: A machine for inductively hardening a workpiece has a stationary frame, a holder on the frame adapted to secure the workpiece in a workspace, and a control housing fixed on the frame and containing a transformer. A slide is movable on the frame relative to the workspace and carries an inductor juxtaposable with the workpiece in the workspace. A flexible high-current cable extends between the fixed transformer and the movable slide for feeding electricity from the transformer to the inductor.

Abstract: A machine for inductively hardening a workpiece has a stationary frame, a holder on the frame adapted to secure the workpiece in a workspace, and a control housing fixed on the frame and containing a transformer. A slide is movable on the frame relative to the workspace and carries an inductor juxtaposable with the workpiece in the workspace. A flexible high-current cable extends between the fixed transformer and the movable slide for feeding electricity from the transformer to the inductor.

Abstract: A device for inductively heating a workpiece has an inductive load path formed by an induction coil juxtaposed with the workpiece and an AC voltage applied across the induction coil and dropping during heating. According to the method the level of the AC voltage is determined. From this determination a voltage-time area over the duration of the heating process is calculated. The determined voltage-time area is then compared to a previously established reference area.

Abstract: In a method for producing bores, a tool connected as a cathode and a workpiece connected as an anode are connected to a voltage source. The workpiece and the tool are connected to one another in an electrically conductive manner via an electrolyte, and an electrical potential difference between the workpiece and the tool is formed at least at times for removing material from the workpiece. Furthermore, the workpiece and the tool are subjected to a relative movement in relation to one another for producing the bore. The potential difference between the workpiece and the tool is formed by a corresponding voltage level in such a way that a gas-vapor envelope which surrounds the tool is formed.