Eng. Mgt 385: Lecture #2 Statistical Process Control Stephen A. Raper Quality Overview

Goals SPC Can Help Achieve To create products and services that will consistently meet customer expectations and product specifications To reduce the variability between products or services so that the results match the desired design quality To achieve process stability that allows predictions to be made about future products or services To allow for experimentation to improve the process and to know the results of changes to the process quickly and reliably To further the long-term philosophy of continual improvement To minimize production costs by eliminating the costs associate with scrapping or reworking out-of-specification products To place the emphasis on problem solving and statistics To support decisions with statistical information concerning the process To give those closest to the process immediate feedback concerning current production

Goals SPC Can Help Achieve To assist with the problem-solving process To increase profits To increase productivity

Positive Results of SPC Uniformity of Output Reduced Rework Fewer Defective Products Increased Output Increased Profit Lower Average Cost Fewer Errors Predictable, Consistent Quality Output Less Scrap Less Machine Downtime Less Waste in Production Labor Hours Increased Job Satisfaction Improved Competitive Position More Jobs Factual Information for Decision Making Increased Customer Satisfaction Increased Understanding of the Process Future Design Improvements

Some Definitions Non-faulty systems Fitness for use Conformance or nonconformance to requirements Meeting or exceeding customer expectations The characteristics of a product or service that bear on its ability to satisfy stated or implied needs A product or service free of defects

Approaches To Quality No Inspection 100% Inspection –Advantages? Disadvantages? Acceptance Sampling Statistical Process Control

Program Completed Program Completed University of Missouri-Rolla Copyright 2001 Curators of University of Missouri