Recently, incremental sheet metal forming (ISMF) process as one of the new methods in rapid prototyping collection has been considered by researchers. This process is based on a defined path in CNC controller and applies a spherical-head tool that supplies the required pressure for sheet metal forming. Despite affirmation of process ability in forming symmetric geometries, some of its aspects such as: high cost in die design and its manufacturing, high cost in using NC machine tools and time consuming forming processare its constraints. Hereupon, a new method for incremental sheet metal forming on turning machine has been presented. This process uses a spherical-head tool in tool-holder turret, forming sheet metal in symmetric geometries in shortest possible time without requiring a die. With a view to increasing sheet formability, two types of forming strategies were designed and implemented. Finally, the best forming strategy based on final forming depth and effective strain calculations is introduced.