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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...
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.
In this Question Line video, Jason reviews a submitted weldment drawing and demonstrates how to calculate the position tolerance needed for a zero-clearance fit in the worst-case assembly scenario, ensuring that the shaft can pass through two coaxial holes.
In this Question Line video, Jason shares some quick sanity checks that can help identify manufacturing issues for an extruded part being controlled by profile of a line tolerances.
In this Question Line video, Jason answers a question regarding how to report form variation on a part made from sheet metal.
In this Question Line video, Jason explains how an irregular feature like a hexagon can serve as a primary datum feature and discusses how this part could be inspected – touching on gage design for manual inspection and point cloud analysis using a CMM.
What does it mean when a dimension is circled on a drawing—and how does it impact manufacturing? In this video, Jason explains the informal use of ovals as quality control symbols and what it means for how parts are made and inspected.
Jason discusses how to control a repetitive pattern of features to a central datum using a “#X INDIVIDUALLY” note with a datum feature.
Jason walks through tolerance analysis for a profile control and shows how the feature control frame defines the location and orientation of the tolerance zone.
In this Question Line video, Jason reviews a submitted drawing that attempts to locate two parts relative to each other and explains how to choose the correct GD&T tolerances to support the intended function.
In this video, Jason explains when simultaneous requirements apply and how the “separate requirements” note affects inspection, sharing examples that illustrate reasons for using each approach.
In this Question Line video, Jason answers the questions regarding the use of the Unless Otherwise Specified (UOS) statement on a drawing.
Learn how significant figures define unspecified tolerances and how ASME Y14.43 helps determine the required accuracy of measurement equipment.
In this Question Line video, Jason compares flatness applied to a feature of size with flatness applied to a surface.
In this Question Line video, Jason answers a student's question regarding whether a default angular tolerance (found in the Title Block) must be taken into account in addition to the part meeting Rule #1 for it to pass inspection.
In this Question Line video, Jason compares two similar part drawings - one containing the Continuous Feature symbol and the other having a simultaneous requirement for a pattern of features - and discusses how the inspected values would be reported.