Abstract: Today, in most of metal machining process, Computer Numerical Control (CNC) machine tools have
been very popular due to their efficiencies and repeatability to achieve high accuracy positioning. One of the factors
that govern the productivity is the tool path travel during cutting a work piece. It has been proved that determination
of optimal cutting parameters can enhance the machining results to reach high efficiency and minimum the
machining cost. In various publication and articles, scientist and researchers adapted several Artificial Intelligence
(AI) methods or hybrid method for tool path optimization such as Genetic Algorithms (GA), Artificial Neural
Network (ANN), Artificial Immune Systems (AIS), Ant Colony Optimization (ACO) and Particle Swarm
Optimization (PSO). This study presents a review of researches in tool path optimization with different types of AI
methods that show the capability of using different types of optimization methods in CNC machining process.