Multi-vari and pre-control charts in our final Shainin column.
March 1, 2018
Multi-vari charts are a useful tool for presenting analysis of variance data in graphical form. They can identify patterns of variation, on a single chart, from many causes.
In the 1980’s the concept of data collection for process control took a major leap forward. This was about the time that a combination of electronic technology and economics allowed gaging to become digital.
When faced with most problems dealing with processes, products, or service, quality professionals typically implement two types of remedial actions which were handed down to us by experts like Dr. Joseph M. Juran, Dr. Frank Gryna, et al. “Control of nonconforming product” and “root cause analysis with corrective action” are two separate and essential processes.
Quality at the source (QATS) has been used well before lean manufacturing became so popular. Many people in the quality function have applied the principles especially at critical work areas to detect nonconforming items and prevent them from moving forward in the process.
Winona PVD Coatings takes quality so seriously that out of the almost 1.5 million wheels shipped in the past ten years, the company has seen the number of returns in the single digits.