**5.4 Borders of machining for finishing in specific areas**

Similar upon roughing, the operations of finish also should possess limitations of the areas of machining. These borders of finish (boundaries) can be created by different ways:


(a) Boundary calculated by an specific surface

(b) Boundary created by sketch wireframe

Fig. 13. Boundary for finishing

There are other ways to calculate boundaries, in agreement the software CAM utilized. In many cases, the software CAM utilizes the geometry of the boundary as information help for carry out the calculations of the paths of the tool. Boundaries improperly formed can impact the quality of the machining process. It must itself consider that this boundary many times is a curve kind Spline. Inflection in this curves, which will transformed in a boundary machining are transferred for the tool paths, injuring the quality of machining. A help with the CAD in these occasions can be convenient, in agreement demand of the agreement.
