ISO 10303-214:2010(E)
A Position_tolerance is a constraint on the location of a Shape_element. It defines a zone within which the centre, axis, or centre plane of the considered Shape_element is permitted to lie.
NOTE 1 Basic dimensions establish the true position from specified datum features and between interrelated features.
NOTE 2 The concept of position tolerances is defined in ISO 5458 [14].
A Position_tolerance is a type of Geometric_tolerance.
The data associated with a Position_tolerance are the following:
The affected_plane specifies the plane in which a certain type of geometric tolerance applies. This attribute covers information that corresponds to the drawing plane on drawings. If the affected_plane attribute is not specified, the tolerance applies in all directions which results in a cylindrical tolerance zone (on drawings indicated by the diameter symbol).
EXAMPLE Figure 55 illustrates the meaning of the affected_plane in the case of a Position_tolerance.
See position_tolerance to reference_plane for the application assertion.
The affected_plane need not be specified for a particular Position_tolerance.
The reference_datum specifies the Datum_reference objects that define the reference for this type of geometric tolerance.
See position_tolerance to datum_reference for the application assertion.
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