##

## Dimensioning Cylindricity

Looking for XactMeasure GD&T dimensions? If so, see:

- Using Feature Control Frames
- GD&T Dialog Box

Dimension Cylindricity dialog box

The Insert | Dimension | Cylindricity menu option determines the cylindricity of a cylinder. This dimension type is considered one sided, meaning a single positive value tolerance is applied.

For legacy Circularity and Cylindricity dimensions as well as a Location dimension's RN Line, the feature solution is used to compute the dimension. By default this is Least Squares. However, you can choose to solve the feature using Minimum Separation, Maximum Inscribed, Minimum Circumscribed, or Fixed Radius regression algorithms.
FCF Circularity and Cylindricity dimensions on the other hand are computed using the Chebychev algorithm (Min/Max) as required by the Y14.5 standard. Because of the change in calculation, Circularity and Cylindricity FCF dimensions will generally compute to a slightly smaller value than their legacy counterparts.

More:

To Dimension a Feature Using the CYLINDRICITY Option

Plus Tolerance for Cylindricity Dimensions