Attachment and method for machining globe valves

A method for computer numerical control (CNC) machining internal structures of globe valves from a solid piece of forged metal, comprising:

• providing a globe valve design comprising an internal structure and one or more openings, wherein the one or more openings and the internal structure of the globe valve design are configured such that standard CNC machining turning and milling tools are geometrically incapable of machining the internal structure of the globe valve design through the one or more openings of the globe valve design;
• creating a custom CNC machining turning or milling tool corresponding to the globe valve design, wherein the custom CNC machining turning or milling tool comprises an arm and a branch connected to the arm;
• providing the solid piece of forged metal;
• treating the solid piece of forged metal to limit selective phase corrosion;
• and
• CNC machining the one or more openings and the internal structure of the globe valve design from the solid piece of forged metal using the standard CNC machining turning or milling tools and the custom CNC machining turning or milling tool corresponding to the globe valve design.

A method for computer numerical control (CNC) machining internal structures of globe valves from solid forged nickel, aluminum, bronze (NAB), comprising:

• providing a first 3D model of a globe valve design comprising an internal structure and one or more openings;
• analyzing the first 3D model to create a second 3D model of a custom CNC machining turning or milling tool, wherein the custom CNC machining turning or milling tool comprises an arm, a branch connected to the arm at a first angle, and a tip connected to a distal end of the branch, wherein the tip extends further from the distal end of the branch;
• manufacturing the custom CNC machining turning or milling tool using the second 3D model;
• providing a piece of solid forged NAB;
• CNC machining an outer shape of the globe valve design using a standard CNC machining turning or milling tool from the piece of solid forged NAB corresponding to the globe valve design, wherein the standard CNC machining turning or milling tool extends along a single axis;
• replacing the standard CNC machining turning or milling tool with the custom CNC machining turning or milling tool;
• and
• CNC machining the one or more openings and the internal structure of the globe valve design from the piece of solid forged NAB using the custom CNC machining turning or milling tool corresponding to the globe valve design.