explain how least material boundary defines internal or external limits under gd&t, using least material condition and geometric tolerance to datum feature simulators and reveal datum shifts and virtual condition.

Explain fundamental rule a by showing how to assign tolerances to each dimension using direct or indirect methods, noting decimal digits, reference dimensions, and hidden tolerances.

Apply three checks to identify necessary dimensions for manufacturing, inspection, and assembly, then avoid overdimensioning and minimize reference dimensions to reduce ambiguity.

Master the fundamental rule g, which requires arranging dimensions for readability and showing them in true profile views tied to visible outlines, while avoiding hidden outlines and misinterpretations.

Apply fundamental rule: a 90-degree angle defaults to center lines and feature lines in a two-dimensional orthographic drawing. If controlled, provide a node or tolerance table to define angular tolerances.

Apply the fundamental rule: a 90 degree basic angle defaults between center lines in two dimensional orthographic drawings, for planar surfaces, axes, or center planes to a datum.

Apply the fundamental rule: zero basic dimension by default for coincident central planes or surfaces, linking datum center plane to the feature center.

Apply straightness to surface elements with a feature control frame, using two parallel lines 0.5 mm apart; derive the medial line within a 0.5 mm diameter cylindrical tolerance zone.

Explore how to define the derived medial line for a cylindrical aperture by establishing the envelope axis and using the center points of segments perpendicular to that axis.

Apply rule #1 to the straightness deviation of surface elements on a cylindrical regular feature of size, with the maximum material condition boundary equating the deviation to the size tolerance.

Assess how rule #1 constrains the straightness deviation of the derived model line by tying the maximum material condition to the size tolerance, using a 20.5 mm diameter boundary.

Learn how flatness on non cylindrical features defines the derived medial plane by establishing the envelope, terminating the center plane, and using segment centers to form the imperfect plane.

Apply circularity as a form tolerance to surface elements like cylinders or spheres, using a distance between concentric circles and applying to circular elements, with no mmc or lmc modifiers.

Apply modifiers to cylindricity tolerances, including the free state modifier for centricity on a silica surface and the statistical tolerance modifier for cylindrical surface with C60, to reflect assembly conditions.