Modifiers like Maximum Material Condition (MMC) allow for "bonus tolerance" as the part’s actual size deviates from its limit, providing flexibility for manufacturing without sacrificing assembly. Y14.5M-1994 - Dimensioning and Tolerancing - ANSI Webstore
Dimensioning and tolerancing must be fully specified so there is a complete understanding of every feature's requirements. Dimensioning and Tolerancing ASME Y14.5M-1994
Controls the physical placement of features relative to each other or a datum. Profile of a Surface, Profile of a Line Controls the boundary of a feature's outline. Runout Circular Runout, Total Runout Controls variation in a surface when rotated about an axis. Building Blocks of the Language Modifiers like Maximum Material Condition (MMC) allow for
A rectangular box that serves as the primary "sentence" for GD&T. It contains the geometric symbol, the tolerance value, material modifiers (like MMC or LMC ), and datum references. Profile of a Surface, Profile of a Line
Imaginary, mathematically perfect points, axes, or planes used as reference points for measurements.
The standard organizes geometric controls into several functional categories to manage different aspects of part geometry: Typical Controls Straightness, Flatness, Circularity, Cylindricity
Drawings should define the final part geometry without dictating the specific manufacturing processes (e.g., drilling vs. punching) used to achieve it. Standard Reference Temperature: All dimensions apply at 68∘F68 raised to the composed with power cap F ( 20∘C20 raised to the composed with power cap C ) unless noted otherwise.