Indian Journal of Science and Technology
DOI: 10.17485/ijst/2010/v3i10.7
Year: 2010, Volume: 3, Issue: 10, Pages: 1052-1055
Original Article
R. Radhakrishnan and P. Balamurugan1*
PSG College of Arts and Science, Coimbatore-641 014, TN, India
1 The Kavery Engineering College, Salem-636 453, TN, India
[email protected] , [email protected]
A control chart is a statistical device used for the study and control of repetitive process. Shewhart (1931) of bell telephone laboratories suggested control charts based on the 3 sigma limits. Now the companies started applying 6 sigma initiatives in their manufacturing process, which results in lesser number of defects, are focused in identifying the causes due to assignable causes of variation. The companies practicing 6 sigma initiatives is expected to produce 3.4 or less number of defects per million opportunities, a concept suggested by Motorola (1980). If the companies practicing 6 sigma initiatives use the control limits suggested by Shewhart, then no point fall outside the control limits because of reduced variation. In this paper an attempt is made to construct a 6 sigma based exponentially weighted moving average control chart specially designed for the companies adopting 6 sigma initiatives in their organization. Suitable table is also constructed and presented for the engineers to take quick decisions.
Keywords: Six sigma quality level, control chart, process control, six sigma.
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