report 2

# report 2 - Statistical Process Control A report on an...

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Statistical Process Control A report on an experiment performed for ME 120 Experimental Methods Laboratory San Jose State University Department of Mechanical and Aerospace Engineering Report by: Laboratory Date: March 2, 2009 Report Date: March 11, 2009

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Abstract An electronic caliper was used to take measurements of steel pins diameters. The use of GageWage software was used to interface the caliper with an excel file and get the measurements recoded automatically as they were being taken. Different parameters such as the mean, range, upper and lower control limits were calculated to generate process control charts. Control charts for the pins diameter average and range were created. From this charts we found that the process was out of control based on the observed trends of the data points. The trends observed were up and down trends of data points, runs and points out of the control limit which are all indicators that a process is out of control.
Background and Objectives Control charts are important tool to determined weather a process is out of control. The upper and lower limits can be calculated from data obtained by measuring the final product. The focus of this experiment was to: Gain experience with measuring tools such as calipers Understand the Statistical Process Control concept Generate control charts from data and interpret them Determine weather the process in within statistical control In this experiment we measured steel pins diameters to generate a mean and range control chart. The parameters needed to create the control charts to determine weather the process was within statistical control were calculated from the following equations. R A X UCL X + = (Equation 1, Furman 2009) R A X LCL X - = (Equation 2, Furman 2009) R D UCL R = (Equation 3, Furman 2009) The upper (UCL) and lower (LCL) control limits for the mean (Xbar chart) control chart were calculated from equations 1and 2. Equation 3 was used to calculate the upper control limit for the range control chart. The symbol ( X ) represents the mean of the different measurements, ( R ) is the average of the range and the constants A and D are constants determined by the number of samples measured equal to 0.730 and 2.28 respectively for this experiment.

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Procedure/Apparatus and Experimental Results The following is a list of the items to necessary to complete the experiment.
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report 2 - Statistical Process Control A report on an...

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