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This study presents a novel approach to generate optimized tool paths for free form surfaces that are commonly used in automotive, aerospace, biomedical, home appliance manufacturing and die/mold industries. The developed tool path optimization approach can handle various objectives under multiple constraints. Due to anisotropic geometry of free form surfaces, tool paths become one of the most critical factors for determining cutting forces. Here, firstly the concept of force-minimal tool path generation is introduced and demonstrated for free form surfaces. Nowadays, process planning engineers must select the tool paths only from a set of ordinary tool paths available in CAM systems. These standard tool paths available in CAM systems are generated based on geometric computations only, not considering mechanics of processes, and most often these paths are away being optimum for free form surfaces. Here, a new methodology is introduced the first time for generating the tool paths based on process mechanics for globally minimizing the cutting forces for any given free form surface [2].Also, a novel solution for multi-criteria tool path optimization is presented by the assistance of developed mathematical solution within the physical relationship between the mean resultant force, production time and scallop height. In various CNC applications, the geometric dimensions and tolerances of designed geometry need to be precise to get sufficient results. Therefore the production time is basically spend to be removed the surface scallop height to keep designed geometries as requested. This spent time should be as short as possible, since fast production and quick delivery are most of the important things in today?s competitive world. Including scallop height and production time and the effective forces on the tool as three-criteria, this triple bounded problem is solved in this study by using the objective weighting based algorithm which creates tool paths according to intended criteria is dominating on the others. Additionally, to mention about general solution, the algorithm need to contain free form surfaces and the experimental validation are also covered in the content of this text.