Tapered surfaces must be properly dimensioned to be produced accurately and checked readily with standard gages.
Only three of the four dimensions given for the three parts shown on Drawing #16 are necessary to define a taper accurately.
A conical taper may be defined by a suitable combination of the following dimensions and tolerances.
- The diameter at one end of the tapered feature.
- The length of the tapered feature.
- The diameter of a selected cross-sectional plane which may be within or outside of the tapered feature. The position of this plane is shown with a basic dimension.
- A dimension locating a cross-sectional plane at which a basic diameter is specified.
- The angle of the taper.
If subsequent grinding and plating is necessary, each will affect the dimensions used to limit a taper and its intersecting surfaces and should be considered when dimensioning the component.
Explanation of notes found on Drawing #16:
Note 1, Figure 3: Datum means no tolerance allowed.
Note 2, Figure 2: Any three dimensions can be used.