Cylindricity - GD & T Symbol

Cylindricity - GD & T Symbol
tolerance zone having two concentric cylinders separated by the geometric tolerance.
flatness tolerance zone curling up and becoming the cylindricity Tolerance zone .
3 dimensional form control of-
Circularity
straightness
Taper.
surface taper (preventing conical shapes that exceed cylindricity tolerances)
surface straightness (limiting barrel shapes and waisted shapes )
Cylindricity is not a relationship control – No datum features are referenced.
Surface controls – No MMC used