An electrospindle

An electrospindle comprising:

• a motor (2) for moving a tool;
• a pulling shaft (3) configured to be operatively coupled to the tool and operatively coupled to said motor (2) for a transmission of motion from said motor (2) to the tool;
• a rotating element (4) operatively connected to said pulling shaft (3);
• and
• a joint (5) stably coupled to said motor (2) and having at least one through hole (7) disposed to be hit on a first side (8) by a first end (9) of said rotating element (4), said joint (5) being provided with a fitting (10) for connection to a water supply pipe in said electrospindle (1), said fitting (10) being arranged at a second side (11) of said through hole (7) opposite to said first side (8),
• wherein said joint (5) comprises a water sensor (15) interposed between said fitting (10) and said first side (8) of said through hole (7) so as to detect a passage of water from said through hole (7) toward said motor (2).