Abstract: A processing method of a semi-processed product for obtaining a rotor equipped with a series of blades integral therewith by using a rotating tool such as a cutter, integral or with inserts. The processing method includes a) forming a hole into the semi-processed product; b) forming a series of cavities in the semi-processed product by removing material with the rotating tool to create the series of blades, starting from the hole and following predetermined paths; and c) removing material from the semi-processed product by advancing the rotating tool along its rotation axis and not removing material when the rotating tool advances along the predetermined paths. The rotation axis of the rotating tool is misaligned with respect to an axis of the hole.

Abstract: Disclosed herein is a compound electrode comprising a first portion comprising graphite; and a second portion comprising a metal; wherein the first portion is in continuous communication with the second portion along a length of the compound electrode. Disclosed herein too is a compound electrode comprising a first portion comprising graphite; and a second portion comprising a metal; wherein the first portion is in a tight fit with the second portion along a length of the compound electrode. Disclosed herein is a method comprising creating an electric arc between a compound electrode and a workpiece; wherein the compound electrode comprises a first portion comprising graphite; and a second portion comprising a metal; wherein the first portion is in a tight fit with the second portion along a length of the compound electrode; and removing a portion of the workpiece.

Abstract: Processing method of a semi-processed product for obtaining a rotor equipped with a series of blades integral therewith by means of a rotating tool such as a cutter, integral or with inserts, said processing method comprises phase a) forming a series of cavities on said semi-processed product by means of said rotating tool to create said series of blades, characterized in that said phase a) comprises phase b) forming a hole in said semi-processed product and phase c) removing material from said semi-processed product by advancing said rotating tool along its rotation axis, and in that said rotation axis of said rotating tool is misaligned with respect to the axis of said hole.