Indexable multi-insert milling cutters are the most economical and productive face milling tools. In case of the Inconel alloy machining there are some specific cutting conditions and strategies that influence cutting tool life and surface quality. When the indexable cutting inserts are used, it is recommended to use always down milling and avoid positioning cutter on-centre. For the tool entry is recommended reduce feed rate and use roll on strategy. When different tool dimeters are used there are different cutting conditions which is influenced by the principal cutting edge angle and it influence cutting tool life and tool wear character. This study is focused on the influence of the three different cutter diameter on the cutting tool life when the Inconel 718 is machined. For the tests different cutter diameters with same rounding cutting inserts are used. The trajectory of the movement are simulated for all diameters by the 3D view and on the base of it the real cutting conditions are calculate and setup for the practical experiment. During the tests, the cutting forces are monitored as well as cutting inserts tool wear (2D visualization and 3D visualization). For the comparing of the tool wear character the difference analyses is used and 2D cuts are made for the evaluation of the general tool wear parameters.