Geometric Dimensioning and Tolerancing Course (ASME Y 14.5)

Learn dimensioning in GD&T, covering millimeter and inch formats, baseline spacing, and key dimension types like reference, spot face, standard hole, basic, foreshortened radius, machining, and coordinate dimensions.

Explore the difference between coordinate tolerance and geometrical tolerance, comparing square and circular tolerances, plus and minus limits, and how position tolerances ensure proper hole and shaft fits.

Apply tolerance concepts across three categories—assembly fits, manufacturing processes, and inspection—distinguishing clearance, transition, and interference fits between hole and shaft to ensure proper function.

Explore how to apply tolerances in manufacturing for cnc machines and 3d printing, using dimension-based and printer-specific tolerance values across polyjet, sls/mjf, sla, and fdm.

Learn six degrees of freedom—translations along x, y, z and rotations about axes—and how datum, three planes, two axes, and one point arrest motion in SolidWorks.

Apply datums to fix components in exact positions using the primary, secondary, and tertiary datums with the 3-to-1 principle, and arrange them in A, B, C order.

Apply datum on rectangular and polygonal parts by selecting edges or dimensions to fix faces and centers, compare edge and dimension datum methods, and understand how datums arrest movement.

Apply datum to cylindrical parts by fixing at end points, flat faces, or cylindrical faces, using circular edges and points to arrest shaft movement and axis alignment.

Position the part using a datum to fix its location by applying primary datum A, secondary B, and tertiary C in that order, arresting faces and holes for precise mating.

Explore external datum and internal datum concepts in geometric dimensioning and tolerancing, learning how to arrest part movement by fixing the axis using outer faces or internal cavities.

Apply multiple datums to a component by starting with the primary datum to fix the axis and faces, then apply secondary and tertiary datums to mate cylindrical and rectangular features.

Explore how to apply and read datums on drawings, using primary datum d and secondary datums e and f, with 0.12 and 0.2 tolerance limits to control perpendicularity and location.

Learn how to apply a datum target to specific locations, choose primary and secondary datums, and fix components using datum targets in SolidWorks across front and top views.

Identify and apply datum targets to fix components at precise positions using cylindrical or square forms, enabling linear and rotational motion with primary, secondary, and tertiary datums.

Apply a datum target to fix positions of a moving component and guide motion using symbols for horizontal, vertical, or rotational movements on circular or cylindrical faces.

Explore how datum and datum target are applied in ASME Y14.5-2018, covering the 12 geometric characteristic symbols across form, orientation, profile runout, and location tolerances with examples.

Explore geometrical tolerance and its difference from coordinate tolerance using 14 characteristic symbols. See flatness, parallel, perpendicular, and concentric symbols apply tolerances to features without numerical values.

Explore flatness, a three-dimensional tolerance using two planes to control a surface within a defined limit, with machining and measurement implications.

Learn how form tolerance via straightness, defined by two lines, controls straight-line regions on cylindrical and rectangular features within a defined limit, measured section by section with a dial indicator.

Read straightness tolerance through two examples, distinguishing edge applications from axis control, and learn to evaluate deviations within a 0.5 total limit using center portions and axis profiles in SolidWorks.

Learn cylindricity, a form tolerance for cylindrical parts using concentric cylinder walls to control the tolerance limit. Apply a 0.5 tolerance to shafts and mating holes, measured with dial indicators.

Explore form tolerances, focusing on circularity; compare it with cylindricity, explain two-dimensional circularity for cylindrical surfaces, and show section-by-section measurement using dial indicators to control surface deviations.

Learn to read circularity form tolerance by applying circularity symbols to edges and cylindrical features, defining a circular tolerance zone, and verifying axis and center positions within limits.

Learn how orientation governs parallelism as a dependent tolerance tied to opposite surfaces, defined by a datum in ASME Y 14.5, with practical examples and datum-based control.

Apply parallelism tolerance to rectangular and cylindrical features using a primary datum, controlling axis location within 0.6 mm and 1 mm, per ASME Y14.5.

Apply perpendicularity with a primary datum and a feature control frame to keep the axis within a 0.5 tolerance, and verify using a dial indicator.

Learn to read and apply the perpendicularity symbol in a SolidWorks model by fixing a datum, applying the tolerance to cylindrical features, and visualizing the tolerance zone.

Learn angularity as a dependent tolerance like parallelism and perpendicularity, fixed to a datum at an angle (60 degrees) with a 0.030 tolerance, using a datum simulator and dial indicator.

Apply and read angularity tolerances by establishing the axis and datum. Attach angular dimensions, tolerance zones, and primary datum to control the axis and its limits.

Explore total runout as a geometrical characteristic in ASME Y 14.5, measuring a shaft under running conditions with dial indicators, datums, and tolerance limits.

Apply and read total runout on a cylindrical component by fixing a datum and verifying the entire surface stays within a one-unit tolerance under running conditions.

Explore circular runout and circularity tolerance within total runout concepts, learn 2D, section-by-section measurement with a dial indicator, and how datum features and rotational movement affect tolerance application.

Fix a datum, apply circular runout tolerances with a feature control frame, and measure targeted sections with a dial indicator under rotation to enforce a 0.5 mm limit.

Use profile of line (2D) and profile of surface (3D) to control outer boundaries of complex shapes within 0.5 mm tolerance, measured by CMM or dial indicators.

Learn to read and apply the profile of line to control tolerance in solid models, using SolidWorks to set sectional distances and 2D measurements.

Learn how the profile of surface symbol defines a 3D tolerance zone that controls an entire curved surface, compares to flatness, and supports complex shapes, demonstrated in SolidWorks.

Learn how to read and apply profile of surface tolerances on a model, controlling the entire curved surface within the tolerance zone in SolidWorks.

Apply concentricity symbols to control the axis of circular features using a primary datum A, and assess center points within the tolerance zone for deviations.

Learn how symmetric location tolerance controls pockets and holes within a defined tolerance zone, and compare symmetricity with other location tolerances to understand machining challenges.

Learn how location and position tolerance control hole and shaft placement, using datums and circular tolerance zones to ensure exact match after machining and measurement.

Explore modifiers in geometric dimensioning and tolerancing, focusing on how opposite mating paths adjust assembly features such as pins and holes to maintain fit within tolerances.

Explore modifier symbols in geometric dimensioning and tolerancing, including maximum material conditions, least material conditions, and regardless of feature size, and learn their meanings, related symbols, and applications.

Master maximum material condition (MMC) to control hole and pin sizes and adjust tolerances in drawings. See how MMC limits interact with holes, shafts, and assemblies to affect tolerance changes.

Explore least material conditions (LMC) and how increasing hole sizes or reducing shafts shifts the tolerance zone, contrasting with MMC.

Explain regardless of size (rdfs) tolerance in high-precision parts, showing that the S symbol fixes the tolerance zone and prevents size modification, and when to use FS for tight fits.

Apply tangency plane concepts with a tangential limit tolerance based on datum A to keep opposite faces tangent and avoid sharp edges, ensuring mating surfaces remain curved within tolerance.

Explore how the independency modifier isolates tolerance zones, applying flatness or other form tolerances to select surfaces while rest remain unconstrained. Learn its impact on mating parts per ASME Y14.5.

Learn how the translation modifier controls moving datum features within a circular 2 mm tolerance zone, applying primary datum A and datum B to fix positions under translation.

Learn how to apply a projected tolerance when bolt size exceeds hole features, using projector tolerance, height offset, and datum references A and B to control assembly fit.

Apply a free state tolerance modifier to secondary features, allowing them to function independently of primary features in assembly and preventing damage to mating features within the tolerance zone.

Explore unequally disposed tolerance modifiers, applying profile of surface, adjusting max and min limits, using datums A and B, and understanding symmetrical vs asymmetrical tolerance zones to control surface deviations.

Learn how continuous features set the tolerance zone for flatness, cylindrical, and boundary features separated by grooves, showing how to apply coordinate tolerances and flatness in SolidWorks.

Explore conical taper concepts by using major and minor diameters and length to compute alpha with (D − d)/L, and determine angles via tan inverse, including ratio-based cases.

Explore slope taper as a rectangle-shaped, draft-shaped alternative to conical taper, using the slope formula (H - h) / L to compute height, length, and angle, including SolidWorks comparison.

Explain how a feature control frame communicates tolerances, symbols, modifiers, and datums for circular and rectangular features, including diametrical symbols, initial values, and the universal order.

The lecture defines virtual condition as the worst-case boundary for hole and shaft mating, using MMC and LMC with geometric tolerance - holes use LMC plus, shafts use LMC minus.

Explore resultant condition in geometric dimensioning and tolerancing, applying MMC and LMC to shafts and holes, with virtual and geometric tolerances, bonus tolerances, and worst-case scenarios.