Machining a part with a large depth of cut sometimes causes problems. In some cases, machining in "rough/finishing" mode is necessary.
Two different examples will be illustrated below. First example: In this particular example, the tools do not have the same Z geometry. In fact, the roughing tool (T21) precedes the finishing tool (T11).
 Conclusion:This first example causes some stresses, which in some cases, may entail the application of a tip (as shown in example two). a) The above example poses quite a considerable drawback. In fact, once the rough cutter has completed its work, the Z movement has to be suspended to allow the tool to leave the material. During this time, the finishing cutter "rubs" against the material, thereby producing a mark on that particular spot (see figure below). If the Z movement is not to be interrupted, then it is essential to re-touch up the surface with the finishing cutter. This could result in a small defect at the intersection between the length and diameter. b) This means of programming means that the insert radius functions G41 and G42 cannot be used in the finishing contour (operation 1:6). In fact, as the end of the contour was executed during operation 1:7 after removal of the roughing tool, the function G41 or G42 must be cancelled at the end of operation 1:5. Second example: With this tip, the problem highlighted above does not exist. This time, it is the finishing cutter (T11) which precedes the roughing tool (T21). All the finishing cutter does is remove a small layer whilst acting like a pitting cutter. Like in the previous example, the roughing cutter removes most of the material.
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