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An SPC Case Study on Stabilizing Syringe Lengths

Summary: [This abstract is based on the authors' abstract.] The final stage of manufacturing self-contained syringes involves the insertion of a cartridge and the electrical tacking of the containment cap at a precisely determined length on the syringe. This process was producing a large amount of scrap and rework due to undesired lengths. X-bar and R charts were applied to the tacking process and were instrumental in identifying the root cause of the problem. This case illustrates properties, pitfalls, problems, and peculiarities in applying such charts. It also demonstrates that trained statistical quality specialists are needed if all the benefits of such charting are to be obtained.

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  • Topics: Quality Control, Statistical Process Control (SPC), Process Capability
  • Keywords: Case study,X-bar and R control charts,Statistical tests,Statistical quality control (SQC),Statistical process control (SPC),Process capability (Cp),Stability
  • Author: Franklin, LeRoy A.; Mukherjee, Samar N.
  • Journal: Quality Engineering