GD&T - (Geometric dimensioning and tolerancing) A 3-D mathematical system that allows a designer to
describe the form, orientation, and location of features on a part within precise tolerance zones.
Advantages of GD&T - 1) The system allows the designer to clearly specify design intent.
2) There is better communication throughout the design process.
3) The system is set up so that almost nothing can be interpreted in more than one way.
4) A datum reference frame
5) Specific form, orientation, and location tolerances that describe 2-D and 3-D tolerance zones within
which all part geometry must fall.
Datum Reference Frame - A theoretical system made up of three mutually perpendicular planes, or
datums, established by real features on the object.
Feature Control Frame - Contains the geometric characteristic symbol, the geometric tolerance, and the
relative datums
Basic Dimensions - A dimension that is theoretically exact. It is identified by a box around the dimension.
It locates the perfect position of features from clearly identified datums.
Maximum Material Condition (MMC) - The condition in which a feature of size contains the maximum
amount of material within the stated limits of size.
Form Tolerances - for individual features and are not related to any datums
Straightness - A zone where it is defined by two parallel lines to create a 2-D zone. The tolerance is view-
specific, meaning the two parallel lines must move from left to right, not from front to back.
Functional Gage - An inspection tool built uniquely for the purpose of quickly checking a specific
dimension or geometric condition on a part to determine whether of not if fall within tolerance limits
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