There are three methods of writing CNC programs, including using CAD/CAM software. CAD/CAM programming minimizes the need for the programmer to perform complex math calculations. Due to the minimal amount of math required by the programmer, CAD/CAM programming tends to be more efficient than manual programming.
By using an existing CAD drawing file and importing data into the CAM software, the programmer only needs to decide on which process and tooling to employ, typically using a list of tooling data and cutting conditions. The CAM software then calculates all of the moves necessary to machine the part.