Issues for Production Manager for an Electronic Circuit Company - Essay Example

As the production manager for an electronic circuit company you have encountered the following situation. Part A process for producing electronic circuits has achieved very high yield levels. An average of only 10 defective parts per million is currently produced. What are the upper and lower control limits for a sample size of 100 N=10 = (3.6) (10/1,000,000) (10) = 0.0036 = (2.0) (10/1,000,000) (100) =0.002 Recompute the upper and lower control limits for a sample size of 10,000 = (3.6) (10/1,000,000) (10,000) = 0.36 = (2.0) (10/1,000,000) (10,000) =0.2 Which of these two sample sizes would you recommend Explain. I would recommend the one with lower sample size (100). The probability of identifying the defective parts from million of produced parts is higher than the high sample. Ranging from low to many samples is more accurate. Part 2 Management has reconsidered the method of quality control and has decided to use process control by variables instead of attributes. For variables control a circuit voltage will be measured based on a sample of only five circuits. The past average voltage for samples of size 5 has been 3.1 volts, and the range has been 1.2 volts. What would the upper and lower control limits be for the resulting control charts (average and range) X= 3.1 MR= 1.2 UCL = 3.1 + (2.66*1.2) = 6.292 CL = 16.8 LCL =3.1 - (2.66*2) = -2.22 Five samples of voltage are taken with the results in the table below. What action should be taken if any Action to be taken: The Sample 5 Reason: The range is more constant having the average value of 2 Discuss the pros and cons of using this variables control chart versus the control chart discussed in the first part of the assignment. Which do you prefer Control charts can indicate when the adjustments are necessary and when they are not. To determine the natural range or control limits of a process and to compare it to its specified limits. If the range of the control limits is wider or higher than the one of the specified limits, the production process will need to be accustomed to inform about the process capabilities and stability. Samples need to be taken on a controlled regular basis and tested to make sure that the quality is acceptable. References: Clarkson, Elizabeth. "A Process Control Primer" February 24, 2000 from: http://members.cox.net/bethclarkson/Articles/ControlCharts.html Bass, Issa. "Control Charts" Sixsigmafirst Group, Inc.2005 from: http://www.sixsigmafirst.com/controlcharts1.htm Read More