Geometric dimensioning and tolerancing, sometimes known as GD&T, was introduced during the 1950s as a more accurate and cost-effective method of dimensioning and tolerancing mechanical parts.
What is Geometric Dimensioning and Tolerancing?
If the diameter of the tool was 10 mm and had a tolerance of ☐.02 mm, the maximum diameter the tool could be is 10.02 mm and the minimum 9.98 mm. For example, if manufacturing a drill head, a tolerance would need to be defined to ensure that the tool would still be usable regardless of the variation from the desired value. To correctly tolerance a component, the designer must have an in-depth knowledge of how the part will function. Tolerancing is the most common callout on an engineering drawing and defines the acceptable range a feature can vary from its specified dimension. Information on said standards can be found here. In the UK, dimensions included within engineering drawings are expressed in millimetres and should follow British standards. A correctly dimensioned part should communicate the designer's intentions to the manufacturer and quality inspector. Within this engineering drawing, the dimensions of key features are defined. Before a part can be manufactured, specific information on the size and shape must be communicated through an engineering drawing or Model Based Definitions (MBD).
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