Understanding the process and getting the right information to the right people at the right time are today’s challenges in manufacturing. So, nowadays many companies use process control statistics (well known as SPC) to minimize variation and to maximize manufacturing processes. Sometimes corporates implement SPC to satisfy consumer requirements or to meet certification requirements. A control chart has a centerline, a lower control limit and an upper control limit. It will give operating official a tool to recognize when a special cause of variation has entered the process so that the special cause can be eliminated.
The benefits of process control statistics can accrue to fabricating procedures have long been known in the technical-related industries, especially in big-volume fabricating conditions, and in those where product quality is synonymous with safety or reliability. Such benefits include accurate assessment of process ability, predictable levels of process control, timely detection of process drift or “special causes” of variation, quantifiable customer quality assurance and effective recording of qualityrelated data.