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