Some Statistical Control Techniques for Job Shops


Cook Jr., Hardy M.   (1989, ASQC)   Consultant, Baltimore, MD

Annual Quality Congress, Toronto, Ontario, Canada    Vol. 43    No. 0
QICID: 3634    May 1989    pp. 638-642
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Article Abstract

Usually statistical process control procedures are installed on the manufacture of products that are produced in great quantities. In this case the control charts are used for control of the final product, its sub-assemblies, its piece parts or even single characteristics of all the preceding items.

Job shops do not have the benefit of large production as many times their orders consist of 100 to 300 items. Sometimes their orders may be even smaller than that. The usual statistical process procedures are not suitable for such low production without adapting them to the particular situation.

An examination of the quality literature showed few articles relating to quality control in Job Shops. In most of these articles, Inspection was used to control quality.

This paper will show some techniques for controlling quality during manufacturing. The following will be presented:

  1. The adaptation of a regular statistical process control chart for usage with low production runs.
  2. An example of where a regular statistical process control chart could be used in a Job Shop situation.
  3. A procedure with statistical validity, called Pre-Control which is very useful in Job Shops; especially where machine shop operations are the manufacturing method.
These are just a few ideas for changing Job Shop Quality Control to prevention of manufacturing defects rather than relying on sorting the good from the bad in Final Inspection.



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