Statistical P S i i l Process Control C l 26 August 2009 University Malaysia Perlis P li Presented by Dr Zaharah Wahid DRZ CONSULTANT 1 An Overview of Statistical Process Control (SPC) DRZ CONSULTANT 2 What is SPC Statistical : A universal language to describe and analyse the physical variability of a process. Process : The transformation of inputs including f f man‚ machinery‚ methods‚ materials‚ energy and information to attain a desired result result. Control : To make a process behave
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Basic Tools for Process Improvement Module 10 CONTROL CHART CONTROL CHART 1 Basic Tools for Process Improvement What is a Control Chart? A control chart is a statistical tool used to distinguish between variation in a process resulting from common causes and variation resulting from special causes. It presents a graphic display of process stability or instability over time (Viewgraph 1). Every process has variation. Some variation may be the result of causes which are not normally
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5.4 5.4 5.5 3 5.9 5.6 5.2 5.2 5.6 4 5.5 5.5 5.9 5.3 5.3 5 5.5 5.4 5.8 5.3 5.2 6 5.4 6.0 5.9 5.3 5.6 7 5.6 5.2 5.3 5.6 5.9 8 5.8 5.2 5.3 5.6 5.5 Construct control charts for the shaft diameter for 3-sigma limit of confidence. Find whether the process is in control or not? Test with following data and find whether it meets specifications or not. Sample No. No. of Observation Sample No. No. of Observation 1 2 3 4 5 1 2 3 4 5
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Control Charts Control Charts are use to distinguishes between specialcause or common-cause of variation that is present in a process. There are two basic types of control charts:- Variables - Quantitative data (Measured) Attributes - Qualitative data (Counted) Variable Control Charts Use actual measurements for charting Types:- Average & Range charts Median & Range charts Average & Standard deviation charts Individual & Moving Range charts Run Charts Attribute
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Control Charts Control charts‚ also known as Shewhart charts are tools used to determine if a manufacturing or business process is in a state of statistical control. The control chart was invented by Walter A. Shewhart‚ (also known as the father of statistical quality control) while working for Bell Labs in the 1920s. The company’s engineers were seeking to improve the reliability of their telephony transmission systems. The engineers had realized the importance of reducing variation in a manufacturing
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Standard Operating Procedure for inline Q.A‚ using Statistical Process Control charts OBJECTIVE To remove or minimize‚ cost of poor quality. SCOPE This procedure is applicable for all kind of critical points for which variable charts are being made to know about the process stability. RESPONSIBILITY 1) Q.A. Manager Q.A. Manager is responsible for allotting the critical points in a particular product to in line Q.A.’s. 2) A.Q.M. A.Q.M. is responsible for carrying out
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Statistical Process Control: GMS-401 F2013 In GMS-401 we study 2 types: 1. Inspection for variables —there is typically one dimension most indicative of QUALITY or lack of Quality of an item being studied for compliance to a Quality Standard. Here it is a dimension such as the contents of a jar of fruit jam‚ the size of a pair of shoes etc. These are called X-bar and R charts. One calculates X-bar-bar and R-bar averages and these are the centre lines of the SPC run-charts that will be drawn
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Area Chart Figure 1: Area chart Use it to... * Display over time (or any other dimension): * How a set of data adds up to a whole (cumulated totals) * Which part of the whole each element represents Variants * Percentage: The sum always represents 100% (relative scale) * Cumulative: The sum can vary according to the elements (absolute scale) Column/Bar Chart Use it to... * Present few data over a nominal (e.g. countries‚ testing conditions‚ ...) or interval
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forms. Organizational charts are used to visually summarize the structure of a business. By using charts to study the overview of a business’ structure‚ owners can analyze how effective operations run. By identifying bottlenecks and redundancies‚ organizations ensure smoother operations and increased efficiencies. Organizational charts display businesses from different aspects depending on the nature of the business and the needs of the chart creators. When creating charts‚ it is essential to think
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The bar chart shows global sales of games software‚ CDs and DVDs or video between 2000 and 2003. In 2000‚ the largest number of sales was CDs‚ at about 35$bn‚ the smallest number of sales was games software‚ at about 10$bn‚ and the sales of DVDs were just under 20$bn. The next year‚ the sales of games software increased slightly‚ at about 15$bn. There was a slight rise in sales of DVDs to just over 20$bn‚ whereas the sales of CDs dropped steadily to 33$bn. The number of games software increased
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