This paper proposes the theory for the Low Cost Automation (LCA) as a intermediate process of the factory automation, where the SCA is new adaptation for the improving productivity without changing the current product lines. And also this paper deals with the case study for the predictable effects and technical method at the extruding cable lines. As the results, the implementation of the LCA theory could be acomplished saving materials and man power, improving reliability and productivity. For this facilities, it cost within 5% extra expense of a extruding cable line systems. And it could be refund in six months.