GMW15541

Description / Abstract: Introduction

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose. This standard documents various global agreements necessary to complete control drawing/dataset development and implementation. The standard outlines how control drawing/datasets are used to communicate assembly/subassembly level dimensional requirements to vehicle assembly centers, Value Added Assemblers (VAA), and manufacturing operations. This document describes how key dimensional requirements are communicated to manufacturing, and assembly operations using Statement of Requirements (SOR) documents, process control plans, assembly level Geometric Dimensioning and Tolerancing (GDT) documents and Measurement Point (MP) files.

Keyword Application. The words "shall/must/required" describe an absolute requirement. Procedural steps or processes defined by these words must be followed. The words "should/preferred/recommended" describe preferences. Procedural steps or processes defined by these words must be followed whenever there is no valid reason to do otherwise. The words "acceptable/allowed/may/might" grant permission. The use of these words does not require or recommend the practice or procedure specified; nor do these words forbid or discourage alternative practices.

Applicability. This standard shall apply to all General Motors assembly plants, GM Joint Venture assembly plants, and Value Added Assembly sources which employ control drawings and/or control datasets.

Remarks. This standard describes the process used to develop and compile control drawings/datasets to document specific dimensional requirements for assemblies built at Vehicle Assembly Centers and/or VAAs.

Control drawings/datasets identify critical component, subassembly, assembly and/or finished vehicle level dimensional requirements. Control drawing/dataset dimensional requirements are defined by Dimensional Technical Specifications (DTS) and/or key Vehicle Technical Specifications (VTS). The specific dimensional requirements are "rolled down" from DTS and VTS to the component and assembly/subassembly level. All component and assembly/subassembly level GDT shall be in accordance with ASME Y14.5-2009 as amended by the GM GDT Addendum GMW16812.

Manufacturing shall employ the dimensional requirements and tolerances specified on each control drawing/dataset to manage assembly processes to achieve DTS and/or finished Vehicle Dimensional requirements.