1. CorrectSPC PROCESS CONTROL FOR PRECISION MACHINING
© Bob Doering
All Rights Reserved

2. TRADITIONAL SPC Expects all “special causes” have been eliminated
Expects the remaining variation is random, with most variation close to a central value
Seeks to find trends from within an otherwise random output to act upon when they occur

3. Search for Extraterrestrial Intelligence
TRADITIONAL SPC
Search for Extraterrestrial Intelligence
(SETI)
Traditional SPC is like looking out into space seeking signs of life

4. TRADITIONAL SPC
Typically, you listen to random radio frequency noise looking for a “pattern” – as a pattern shows intent

5. Wow! signal was a strong narrowband radio signal detected by
TRADITIONAL SPC
Wow! signal was a strong narrowband radio signal detected by
Dr. Jerry R. Ehman on August 15, 1977, while working on a SETI project at The Big Ear radio telescope of The Ohio State University
If you find such a trend, then you can take action to determine its origin. This is more “monitoring” than “control”