CHAPTER 9 Dimensioning & Tolerancing Practices

9.107-9

There is a five-step process for applying principles to the design process. They are:

Isolate and define the functions of the features/part.

Prioritize the functions.

Identify the datum reference frame based on functional priorities.

Select the proper control(s).

This section goes into a practical example. It is worth both stepping through this example and then applying the five steps to other simple parts with your students. Often there is not one 'right' answer, but it allows them to think critically about the placement of the reference frame and the selection of controls.