CNC machining process

The CNC machining process begins with a designer creating a 2D vector or a 3D solid part CAD drawing. Once the CAD file is complete, the designer sends it off to an engineering firm for generating a 3D model or rendering of the part. A CAD program will then allow engineers and manufacturers to produce a 3D model of the part and its technical specifications, including dimensions and geometries. Designers and manufacturers often use CAD programs to create models of parts and products for manufacturing purposes. These designs are usually restricted by the capabilities (inability) of the CNC machines and tooling. For instance, most CNC machine tools are cylindrical, therefore the part geometrics possible via the CNC process is limited because the tooling creates curved corners. Also, the properties of the materials being machined, the tooling design, and the workholding capabilities of the machines further limit the design possibilities, such as minimum part thicknesses, maximum part size, and the inclusion and complexity of internal features. After the CAD design is complete, the designer exports it as a CNC-compatible format, like STEP or IGES.