CHAPTER 17What Tolerance Is Really Required?
What you will learn in this chapter is that most tolerances have not been determined based on the needs of the application. 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 be used to make the part. The tightest tolerance that the machine can achieve is then used. Or, the designer just copies the tolerance ...
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