BS EN ISO 14638:2015 pdf free

BS EN ISO 14638:2015 pdf free.Geometrical product specifications (GPS)一Matrix model
For each geometrical property, it is necessary to be able to define a specification for that property, it is necessary to be able to measure the property, and it is necessary to be able to compare the measurement with the specification. The GPS standards relating to these requirements are defined as a series of seven links in each chain of standards (see 3.3).
Some manufacturing processes, such as casting and welding (this list is non exhaustive), have requirements which are specific to that process. Standards which deal with specific processes may be grouped in further chains of standards.
Some machine elements, such as screw threads and gears (this list is non exhaustive), have requirements which are specific to those machine elements. Standards which deal with specific machine elements are grouped in further chains of standards.
Additional geometrical property categories and chains may be added in the future to reflect developments in manufacturing and inspection processes, and other industry requirements.
The standards, categories and chains of standards are arrayed in a matrix so that it is possible to clearly indicate the scope of application of each standard and the relationships between standards.
The ISO GPS standards can be arranged in a matrix of rows and columns. Each row in the matrix consists of one of the nine geometrical property categories, which may be further subdivided into chains of standards, and each column is described as a ‘chain link’. The scope of each ISO GPS standard can be illustrated on the ISO GPS matrix by showing which chain links (columns) in which geometrical property categories (rows) the standard applies to.
Datums are no longer covered by a chain in the matrix, as they are not geometrical properties. Datums are essential for the definition of many of the geometrical characteristics, so ISO GPS standards dealing with datums are represented in the matrix with a filled dot in each chain link to which they relate (see Annex C). BS EN ISO 14638 pdf download.