Method and apparatus for producing a shaped bore

A method of producing a shaped bore, the method comprising:

• (a) providing an elongate cylindraceous member, wherein the elongate cylindraceous member comprises:
• (i) first and second ends positioned on an axis, the second end being configured to couple with a rotary actuation device,
• (ii) a conduit having a length,
• (iii) one or more cutting members located proximate to the first end, each of the one or more cutting members being positioned at a respective first distance from said axis, and
• (iv) two or more vents extending outward from the conduit, wherein each of the two or more vents is configured to expel a portion of fluid communicated through the conduit, wherein at least two of the two or more vents are located at different angular positions about the axis but at a common longitudinal position relative to the axis;
• (b) providing a cam, wherein the cam has an interior surface defining an opening;
• (c) inserting at least a portion of the elongate cylindraceous member through the opening of the cam;
• (d) rotating the elongate cylindraceous member;
• (e) communicating a pressurized fluid through the conduit;
• (f) advancing the elongate cylindraceous member toward a workpiece;
• (g) varying the pressure of the pressurized fluid in the conduit along a portion of the length of the conduit, wherein the act of varying the pressure comprises expelling a portion of the pressurized fluid through the at least two of the two or more vents against the interior surface of the cam;
• and
• (h) engaging the one or more cutting members with the workpiece, wherein the act of engaging comprises advancing at least a portion of the elongate cylindraceous member into or against the workpiece.

A tool, comprising:

• (a) an elongate cylindraceous member, the cylindraceous member comprising:
• (i) first and second ends positioned on a tool axis, the second end being configured to couple with a rotary actuation device,
• (ii) a conduit in fluid communication with the second end and the first end,
• (iii) one or more cutting members located proximate to the first end, each of the one or more cutting members being positioned at a respective first distance from said tool axis, and
• (iv) one or more vents extending outward from the conduit, wherein each of the one more vents is configured to expel a portion of fluid communicated through the conduit;
• and
• (b) a cam positioned along the tool axis, wherein the elongate cylindraceous member is moveable in the axial direction relative to the cam, wherein the cam is configured to resist expulsion of fluid expelled through the vents when the vents are positioned within the cam, wherein the cam has a length and defines an inner diameter, wherein a portion of the elongate cylindraceous member is disposed within the inner diameter of the cam, wherein the inner diameter of the cam varies along the length of the cam.