Bore cutting tool and method of making the same

A method of making a bore cutting tool, the method comprising the steps of:

• providing a tool substrate, the tool substrate having an upper surface;
• providing a tool coating disposed on the upper surface of the tool substrate, the coating having an uppermost surface;
• and
• forming a plurality of pits in and spaced along the upper surface of the tool substrate in an array, such that the plurality of pits are arranged in a plurality of rows and columns with the pits being spaced along the rows and columns, wherein the tool coating extends over the plurality of pits such that the coating follows a contour of each of the plurality of pits to form a plurality of coated pits and over spaces between the plurality of pits, the uppermost surface of the tool coating in the plurality of coated pits extending below the upper surface of the tool substrate at the spaces between the plurality of pits and the tool coating having a thickness that is less than a depth of each respective coated pit of the plurality of coated pits to form a reservoir in each of the plurality of coated pits, the reservoirs being arranged to retain lubricant, the depth extending from the uppermost surface of the tool coating between the plurality of coated pits to the uppermost surface of the tool coating in the plurality of coated pits, wherein an average pit depth is in the range of 8 μm to 25 μm.