Machining tool comprising a generator assembly for harvesting electric energy and a method for such harvesting

A machining tool for chip-removing machining comprising:

• a tool body;
• and
• a generator assembly arranged for harvesting electric energy to be used in the tool and having at least one first component secured to the tool body and a second component movably connected to the tool body so as to, by moving with respect to the first component through interaction, therewith generate electric energy in the first component, the generator assembly including an arrangement configured to conduct a medium flow to hit and act upon the second component for moving it with respect to the first component, wherein the second component includes at least one magnet and the first component includes a first member interacting with the magnet when passed thereby while generating electric energy in the first component, and wherein the first component includes a cantilever having one end secured to the tool body, wherein the first member is magnetic and arranged on the cantilever to make the cantilever flex and oscillate by interaction with the at least one magnet of the second component, and wherein the first component includes a second member of piezoelectric material secured to the cantilever and arranged to flex and oscillate therewith for generating electric energy.