Depth of cut (AP): it is the depth of penetration of the tool in relation to the part, measured perpendicularly to the work plan. Speed of cut (Vc): instantaneous resultant of the rotation of the tool around the part is the tangential speed. The movements of cut and advance occur concomitantly. Speed of advance (Vf): it is the product of the advance for the rotation of the tool. Time of cut (tc): It is the totality of the active times. It represents the time where the movements of cut and/or advance are effectively occurring.

For cylindrical tiltings: Power of cut (PC): it is the available power in the gume of the tool and consumed in the operation of removal of cavacos, it is who interests in the calculations of force and specific pressures. 2.1 – Description of the Procedure the experimental procedure was carried through in the Laboratory of Manufacture Mechanics and for the accomplishment of this assay the following equipment had been used: Machine: Material conventional lathe to be usinado: STEEL SAE 1020 Tool: Hard metal tablet Instrument of measurement: Conventional Paqumetro Equipment of Individual Protection: eyeglasses of security to carry through the tilting the established parameters were necessary to effect the regulation of the machine in accordance with daily pay in the table. The part was fixed by means of three chestnuts, pressed simultaneously with the one aid key. The tool (tablet) was imprisoned in the door tool. The machine was adjusted in the automatic way, as speed and advance daily pay determined by the described data below. After that, the lathe is leagued, is located it tool in the position to zero the graduated ring, goes deep the tool in the given diameter and initiates the process. 2.2 – Measurement of the time and preparation Stretch 1: Lf= 48,5 mm inicial: 207 mm final: 20,2 mm SET UP: 04min45seg f= 0,4 mm ap= 0,5 mm Stretch 2: Lf= 48,5 mm inicial: 20,2 mm final: 19,4 mm SET UP: 50seg f= 0,7 mm ap= 0,8 mm Stretch 3: Lf= 48,5 mm inicial: 19,4 mm final: 18,6mm SET UP: 16seg f= 1,0 mm ap= 1,0 mm 2,3 – Cavacos resultant the cavacos can be classified in three types: continuous: advance is formed in the usinagem of dcteis and homogeneous materials with small average e; of shear: constituted of distinct and juxtaposed groups lamelares, these elements had been cisalhados and partially soldiers after that; of rupture: when they are constituted of pulled out fragmentos of the usinada part.