New ISO 1101:2012

ISO have just published the new version of ISO 1101, the geometrical tolerancing standard.  The BSI implementation, which will be called BS EN ISO 1101, will appear shortly.

The new standard is mainly concerned with ensuring that all geometrical tolerancing requirements can be applied to 3D CAD models as well as to 2D engineering drawings. Although most of the 2D annotation can already be applied directly to a 3D model without any change of notation or meaning, this is not true of all of it. The standard now includes some additional 3D annotation elements, such as annotation planes and orientation planes, to ensure that all requirements can be fully implemented in a 3D environment.

The new revision also includes some minor changes and clarifications to the wording of the standard, as well as some new functionality.  The use of projected tolerance zones is now incorporated into ISO 1101, instead of a separate standard (ISO 10578), and there is now provision for unilateral and unequal bi-lateral tolerance zones with profile tolerances, using a new UZ modifier.