Coolant conduit for a parting-off tool assembly

A parting-off tool assembly comprising:

• a blade holder;
• a parting-blade mounted to, and clamped by, the blade holder, the parting blade comprising:
• an elongated portion;
• opposing first and second blade sides;
• a peripheral blade edge connecting the first and second blade sides;
• and
• a first insert pocket formed along the peripheral blade edge, the peripheral blade edge having first and second blade sub-edges extending from different sides of the first insert pocket;
• a cutting insert mounted to the first insert pocket, the cutting insert comprising:
• a forwardmost cutting edge defining a cutting edge width CW and an extended-width cutting plane PC which is the same width as the cutting edge width CW and extends parallel with the elongated portion of the parting-blade, the elongated portion lying within the extended width cutting plane PC;
• and
• a coolant conduit mounted to the parting-blade, part of the coolant conduit mounted to the elongated portion, the coolant conduit comprising:
• a first extension portion which is elongated and lies only within the extended- width cutting plane PC;
• at least one inlet;
• at least one outlet;
• and
• at least one coolant passageway extending from the at least one inlet to the at least one outlet;
• wherein the at least one outlet opens out at the first extension portion and is located within the extended-width cutting plane PC.