In recent years technology manufacturing is expanding daily. Modern machining industry has found a special place. The separation chip forming process, pieces produced. Selection tool this role in determining the quality and cost of production is part. Predicted forces from entering the tool are important. Experimental measurement of tool forces entered by the dynamometer is time consuming and expensive. For modeling machining finite element method (FEM) with fundamental criterion Johnson - Cook for Aluminum alloy 5083, software ABAQUS was used. In this paper rake angle, speed of cutting and force cutting during chip forming were discussed. Research shows that the simulation results are consistent with experiments. Simulation capability provided accurate predictions of forces into instruments for Aluminum alloy is 5083.