Standards

The main international standards organizations for geometrical dimensioning and tolerancing are:

For blueprint production, whether the print is drawn by a human hand or by computer-aided drawing (CAD) equipment, the American industry has adopted a new standard, ANSI Y14.5M. It standardizes the production of prints from the simplest on-site handmade job to single or multiple-run items produced in a machine shop with computer-aided manufacturing (CAM) software.

There exist standards and practices for creating technical drawings of mechanical parts and assemblies. The governing agency mainly responsible for setting the standards in the United States is ASME. There are a number of documents that cover various aspects of mechanical drawings,including:

• ASME Y14.100 -2004 Engineering Drawing Practices

• ASME Y14.4M -1989 Pictorial Drawing

• ASME Y14.3M -Multi- and Sectional View Drawings

• ASME Y14.1-1995 Decimal Inch Drawing Sheet Size and Format

• ASME Y14.5M-1994 Geometric Dimensioning and Tolerancing

• ASME Y14.13M-1981 Mechanical Spring Representation

It is important that these standards are implemented and followed by the drafter to ensure that the drawings are correctly interpreted by others.

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