Geometric Dimensioning & Tolerancing

Least Material Condition (LMC)

of a part dimension-the condition where the dimension is either at the upper or lower tolerance limit and the part contains the LEAST amount of material

Maximum Material Condition (MMC)

of a part dimension-the condition where the dimension is either at the upper or lower tolerance limit and the part contains the MOST amount of material

Feature

refers to a physical portion of a part. -finished, polished, or flat -spokes -number of holes

Datum Reference

standard notation--->capital letter with box around it

Feature Control Frame

the tolerance for a geometric feature can be easily identified by reading the ____________________.

Datum

theoretically perfect line, point, or plane that is located by a similar feature of the part

GD&T (geometric dimensioning & tolerancing)

well defined system of symbols and notations often used for manufacturing

Form Tolerance

Examples ---> straightness of a shaft or the flatness of a surface

Feature of Size

Width is considered a _________________. -any feature that has a dimension(width, height, depth, diameter, hole depth)

Adaptable Standards

______________________ is not a reason why GD&T is important. -consistent language, allows increased tolerance, defines how to measure & manufacture parts, fully describes the features of a part

Baseline Dimensioning

a dimensioning technique where dimensions are referenced from a common point

Bilateral Tolerance

actual dimension can be either larger or smaller than the dimension shown on the drawing. -Unilateral can only vary in one direction

Running Fit

also called a Sliding Fit

Leader Line, Extension Line

feature control frame must be connected to a _______________ or either side of an ________________________

Five types of Geometric Features

form, profile, orientation, location, & run out

Tolerance Note

identifies the tolerance of all untoleranced dimensions