GD&T - Geometric Dimensioning and Tolerancing

01/2009ATOS Inspection Software includes easy to use GD&T functionality to comprehensively analyse a part regarding dimension, form and location. The user is guided through creation of local datum systems, surface based fitting elements and applying of tolerances.

Geometric Dimensioning and Tolerancing (GD&T) is a symbolic language to define

  • the nominal geometry of parts and assemblies,
  • the allowable variation in form and size of individual features,
  • the allowable variation between features.

The main goal of GD&T is to describe the geometric requirements for part and assembly geometry thus assuring that parts have the intended form, fit and function.

The proper use of GD&T requires dense 3D coordinate information, which makes the ATOS 3D Digitizer to the perfect measuring tool for this analysis.

The ATOS 3D Digitizer differs from traditional coordinate measurement machines and measuring arms. Instead of measuring single points, the complete part geometry is captured in a dense point cloud or polygon mesh describing the object's surface precisely, allowing full-field analysis and detecting errors which point based analysis would miss.

The GD&T module for the ATOS inspection software was developed in cooperation with a customer expert group under the lead of Bang&Olufsen.

The ATOS GD&T module convinces through the following features:

  • Intuitive guidance through the workflow from creation of fitting elements to analysis and exporting.
  • Direct link between drawing and analysis on measured 3D mesh data supports fast analysis work and easy learning curve.
  • Fast and automatic data selection.
  • Very flexible datum system.
  • The clear visualization of the tolerance zones makes it easy to understand and interpret the results.
  • Support for the two main standards: ASME Y 14.5 and ISO 1101, also known as GPS (Geometric Product Specification).
  • Mathematical correctness tested and approved by a second independent expert group (e.g. including MTU).

A free viewer is available to share 3D measurement and inspection data and to perform analysis operations. The Viewer can be downloaded and freely distributed to customers and colleagues.