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We get a lot of questions from students asking why they would want to use Geometric Dimensioning and Tolerancing (GD&T) over coordinate dimensions. Some believe that using GD&T will result in tighter tolerances and increase...
What is GD&T? If you are involved in design or manufacturing, you may be familiar with the term, “GD&T,” or “Geometric Dimensioning and Tolerancing”. Geometric Dimensioning and Tolerancing is a set of rules and GD&T...
Learn the differences between the 2009 and 2018 ASME GD&T exams, explore certification levels, and determine which exam best fits your experience and goals.
What is GD&T? Learn what geometric dimensions and tolerances are and how their tolerance zones differ from traditional numerical ± limits.
In this Question Line video, Jason discusses bonus tolerance for threads and whether a pattern of threaded features can be used as a datum.
In this Question Line video, Jason reveals the GD&T errors hidden throughout the print while sharing his drawing review process for ensuring technical accuracy.
Learn the foundation of GD&T tolerance calculations as Jason explains MMB, LMB, and vector tolerance analysis with a practical example.
Jason demonstrates how to perform a linear vector tolerance calculation to ensure a part's proper assembly fit and function.
Jason explains why every feature should have a tolerance and how thoughtful tolerancing supports design intent, manufacturing, and inspection.
Jason explains composite profile lower frame interpretation, drawing considerations, and inspection implications in this Question Line video.
Jason compares position vs ASME concentricity for aligning inner and outer diameters of a cylindrical part, showing how form error impacts the measurements.
In this Question Line video, Jake demonstrates how to define radial patterns as datums, with guidance from ASME Y14.5.
Thinking of buying GD&T training? Learn the key questions to ask before choosing a vendor to avoid costly missteps and get the most value for your investment.
If GD&T has felt frustrating or hard to apply—even after GD&T training—were you being taught the dots, or being taught how to connect them?
In this Question Line video, Jake discusses common causes of conflicting basic dimensions between a 3D model and 2D drawing and how to to investigate the source of the mismatch.
In this video, Steve identifies first angle and third angle projection symbols and demonstrates how each projection method translates the 3D model into its corresponding 2D views.
In this Question Line video, Jason walks through two examples of composite profile with unequally disposed tolerance zones, discussing why and when they should be used and explaining how the zones interact to control location, orientation, and form.
Position vs runout explained: Learn how each tolerance controls coaxial features, how they’re measured, and what they actually limit.
Circularity vs runout: Learn the key differences, how each tolerance is evaluated, and what each one controls.
Meet Steve Bobek, a GD&T instructor at GD&T Basics whose diverse industry background and hands-on engineering experience help students connect GD&T decisions to real manufacturing outcomes.
In this Question Line video, Jason explains how to report composite position for a pattern of holes, focusing on the challenges and methods of reporting results for the lower framework (FRTZF).
GD&T instructor Jake DeVore brings real-world manufacturing and inspection experience—and a passion for teaching—to every class.
In this Question Line video, Jason explains how the LMC modifier impacts position tolerance, minimum wall thickness, and assembly clearance.
Jason explains surface vs axis interpretations in positional tolerance at MMC, showing how ASME Y14.5 handles extreme form error and inspection decisions.
In this Question Line video, Jason demonstrates how basic dimensions paired with profile of a surface create clearer, more functional surface control.
Learn why Bonus Tolerance at MMC offers little benefit on threaded holes as Jason explains how MMC works and how bonus tolerance is applied.
Jason explains how chamfers and edge breaks are dimensioned and what tolerances apply under ASME standards when none are specified in the field of view.
In this design review, Jason examines the application of GD&T and tolerancing strategy for the Ambifacient Lunar Waneshaft used in the Turboencabulator, focusing on functional intent, manufacturability, and inspection considerations.
In this Question Line video, Jason discusses how to approach situations where the CAD model and drawing information do not match, and how to determine which takes precedence.
Learn how to control position of an interrupted hole by treating it as a single feature or as separate features with simultaneous requirements.
Jason reviews a bad drawing and explains each error, showing how it conflicts with ASME Y14.5 requirements.
In this Question Line video, learn how threaded hole location gauges are used to inspect the pitch cylinder axis and why the projected tolerance zone modifier is often the most functional spec on an internal threaded feature.
In this Question Line video, Jason explains how to properly dimension the usable depth of an internal thread and reviews methods for checking it on a part.
Jason explains how multiple features can be used to create a single datum on a part and why it’s done.
In this Question Line video, Jason demonstrates how the from-to modifier can be applied to create a wedge-shaped tolerance zone for tapered surfaces.
In this Question Line video, Jason reviews a simple part assembly to show how geometry and form factor into the tolerance stack-up analysis.
Jason compares three profile tolerancing methods and explains which option he would recommend.
In this Question Line video, Jason reviews a submitted drawing, explaining the difference between flatness and parallelism, and gives options on how to tolerance the drawing based on what is critical to the design.
In this Question Line video, Jason reviews a drawing of a clevis bracket to show the potential effects of rounding basic dimensions.
In this Question Line video, Jason walks through how to use different tools and setups to inspect the runout between centers for a submitted part drawing.