Week 5 Notes

Week 5 Notes - Control Charts 4/7/2008 9:04:00 AM What is a...

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Control Charts 07/04/2008 08:04:00 What is a control chart? A graphical method for displaying the performance of a process What does it do? Allow the observer to determine if a process is operating in a normal pattern  or an abnormal pattern Does not determine if we are turning out a “good” product, just that the  production process is operating normal Control Chart Basics Centerline representing mean (X bar) Upper and Lower Control Limit line representing the range of variation which  is based on the standard deviation (s) Preparation of Control Charts 1. Determine what measurements are to be used  2. Take data from the process in suitable subgroup size 3. After accumulating a minimum of 10 subgroups, calculate the Xbar and  Range. 4. Plot and examine, if appears normal calculate the center and limit lines 5. Plot and re-examine to make sure no points fell outside the limit lines 
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This note was uploaded on 04/21/2008 for the course M&P 073 taught by Professor Salvaggio during the Spring '08 term at RIT.

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Week 5 Notes - Control Charts 4/7/2008 9:04:00 AM What is a...

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