Chapter 17. What Tolerance Is Really Required?
What you will learn in this chapter is that most tolerances have not been determined by application needs. Tolerances often have little to do with what is really required. Therefore, tolerances can and should be questioned. You will also learn the RSS (root sum-of-squares) approach to calculating stacked tolerances. Tolerances apply to the Improve and Control steps in DMAIC. This chapter is primarily for those involved in design, manufacturing, or process work.
The initial tolerance on a part is often based on the machine that the designer believes will make the part. The tightest tolerance the machine can achieve is then used. Or, the designer just copies the tolerance from another similar part. ...
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