**5.1 Tool paths for roughing**

Upon carrying out machining by milling of a surface, the tool can traverse different routes. The CAM systems offer different tool path options. Although any one of these paths can carry out the operation of machining, they can have repercussions in the trial, differentiating itself mainly regarding the time of machining, demands of the tool of cut, and superficial quality. The identification of these options should be carried out by the user. The CAM systems presented are not able to identify the best strategies of machining for specific cases, according to geometry it be machined, mainly in complex forms.

For the operations of roughing for milling, besides the paths of parallels passes, the CAM systems still developed other strategies as: paths in offset, paths based in the internal contour of the geometry, paths based on the external contour of the geometry.

In the roughing operations, the dimensions of the block of raw material can be utilized to limit the tool paths calculated by the CAM. In this way, this resource permits the user create machining paths in a specific region of the piece.
