17.3. WHAT WE HAVE LEARNED IN CHAPTER 17

  1. Tolerances apply to the Improve and Control steps in the DMAIC process.

  2. Tolerances are seldom calculated based on requirements, so there are potential savings to be realized by reviewing tolerances that cause issues.

  3. When there is a problem with a part, the reaction is often to tighten tolerances on that part, whether or not the tolerance is the issue.

  4. If multiple parts are "stacked" in an assembly, the tolerances on those parts are likely to have been calculated using worst-case methods. Using the RSS method of calculating tolerances can open tolerances on those parts or show how the assembly has less variation than assumed.

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