Keltia’s GD&T Fundamentals Course

Keltia’s GD&T (Geometric Dimensioning & Tolerancing) Fundamentals course provides a comprehensive introduction to the principles, symbols, and applications of GD&T. This course is designed to help engineers, designers, and manufacturers improve design intent, communication, and manufacturing accuracy while reducing errors and costs.

This course is available for both individuals and groups, with 4 to 40 hours of training delivered through our Keltia online portal. https://www.keltia-ireland.ie/online-cad-mentoring/.

Classes typically run on Monday, Wednesday, and Friday in the late afternoon, but scheduling is flexible to accommodate students. Live engineer instructor-led sessions ensure hands-on learning for faster and higher-quality skill development. We also try to tailor our content to your learning needs so if there are specific topics you would like to cover let us know.

Course Content – GD&T Fundamentals

Introduction to GD&T

• What is GD&T? – Importance, benefits, and industry applications.
• Comparison of GD&T vs. Traditional Dimensioning – Why GD&T improves design clarity.

GD&T Symbols & Feature Control Frames

• Datums & Datum Reference Frames (DRF) – Establishing and understanding datum structures.
• Form Controls – Straightness, flatness, circularity, and cylindricity.
• Profile Controls – Profile of a line and profile of a surface.
• Orientation Controls – Parallelism, perpendicularity, and angularity.
• Location Controls – True position, concentricity, and symmetry.
• Runout Controls – Circular and total runout applications.

GD&T Application & Interpretation

• Reading and interpreting feature control frames.
• Material Condition Modifiers (MMC, LMC, RFS).
• Bonus tolerance concepts and how they improve manufacturability.
• Basic vs. Composite Tolerancing – Understanding multiple levels of control.
• How to apply GD&T in 2D drawings and 3D CAD models.