ISO GPS or ASME GD&T (Geometric Dimensioning and Tolerancing) are international, concise and precise symbolic languages developed for the express purpose of documenting design intent, to detail the functional requirements of a manufactured assembly part and to ensure the compatibility and interchangeability of those parts.
GPS/GD&T are the tools to define functional specifications for size, shape, orientation precisely and clearly. They provide the links between theoretical 3D models from CAD/CAM (Computer Aided Design and Manufacturing) and CAI (Computer Aided Inspection), which defines the position of the elements of a manufactured part in the real world.
WHY ADOPT GPS OR GD&T AS A WORK METHOD?
The ISO GPS / ASME GD&T usage:
- Improves the quality of the design, production and control processes and preserves the organization’s knowledge base.
Reduces costs by shortening the production cycle time as well as hidden costs.
Improves communication between company departments (design, production, control) through a uniform and common language. A uniform understanding among all affected organizational functions also reduces the necessary coordination between suppliers and manufacturers to explain the design intent by approx. 50 percent.
Allows the manufacturer to focus on functional constraints in the design and eliminate tolerance specifications where they are not really needed. As a result, the production and control processes are optimized.
Allows the functional inspection of a single item (geometric requirements reflect the functional interfaces and constraints).
The number of changes in drawings can be reduced by performing the correct tolerance analyses, creating compatible drawings and setting the correct tolerance values.
"TES R2GS" METHOD
The "Requirements to Geometric Specification method", referred in short R2GS, developed by Gili Omri, is a straightforward, practical workflow. Aligning product level functional requirements to clear unambiguous geometric specifications, utilizing either ISO-GPS or ASME GD&T Geometric Dimensioning and Tolerancing Standards.