Geometric Dimensioning and Tolerancing (GD&T)

GD&T characteristics and how they are measured.

Geometric Dimensioning and Tolerancing (GD&T) is the language used in design, manufacturing and quality inspection to communicate information on engineering drawings.

GD&T consists of a set of symbols, rules and principles to ensure that everyone has exactly the same information and understanding of a feature or how a part is defined.

The design engineer provides a GD&T drawing to manufacturing department, and they will use this common technical language for communicating what must be done without ambiguity.

Quality engineers will use the drawing to check if components manufactured meet the desired tolerances for each characteristic.

GD&T is a universal system to regulate communication.

We offer GD&T fundamentals training sessions to guide those working in design and manufacture to gain understanding for their individual role.

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Form

This includes:

  • Flatness

  • Straightness

  • Cylindricity

  • Circularity/Roundness

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Orientation

These characteristics include:

  • Perpendicularity
  • Parallelism
  • Angularity

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The only premium manufacturer of CMM’s in the UK – Manufactured in Derby. Bridge type and gantry CMMs with options for tactile probing and laser scanning

Location

These characteristics include:

  • True Position

  • Profile of a surface

  • Profile of a line

Location derived from median points

These characteristics include:

  • Concentricity

  • Symmetry

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Affordable, high accuracy, fast measurement. Illumination for measurement of otherwise hard-to-measure shiny parts simple, optional UKAS calibration.

The only premium manufacturer of CMM’s in the UK – Manufactured in Derby. Bridge type and gantry CMMs with options for tactile probing and laser scanning

Runout

These characteristics include:

  • Circular runout
  • Total runout

Affordable, high accuracy, fast measurement. Illumination for measurement of otherwise hard-to-measure shiny parts simple, optional UKAS calibration.

Robust, shop floor optical shaft metrology at its simplest, fastest and most accurate.

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