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The type of tolerances used with symbols in feature control frames can be: equal bilateral; unequal bilateral; unilateral; no particular distribution (a "floating" zone) Tolerances for the profile symbols are equal bilateral unless otherwise specified, and for the position symbol tolerances are always equal bilateral.
ASME Y14.5 is a complete definition of Geometric Dimensioning and Tolerancing. It contains 15 sections which cover symbols and datums as well as tolerances of form, orientation, position, profile and runout. [3] It is complemented by ASME Y14.5.1 - Mathematical Definition of Dimensioning and Tolerancing Principles.
Engineering tolerance is the permissible limit or limits of variation in: a physical dimension; a measured value or physical property of a material, ...
The nominal tolerance feature is a plane or a straight line. ∠ : angularity: The nominal tolerance feature is a plane or a straight line ⌒ profile of a line: The specification containing this symbol is considered as an orientation specification when the specified datum is locking only rotational degrees of freedom.
In fabricating, a profile consists of the more-or-less complex outline of a shape to be cut in a sheet of material such as laminated plastic, aluminium alloy or steel plate. In modern practice, a drawing office determines the shape and dimensions required to fit the sheet into a larger work and feeds directions to a computer controlling a ...
English: Symbol used in a feature control frame to specify a feature's description, tolerance, modifier: Unilateral (appears in the 2009 version of the standard, and refers to unequal profile distribution)
Projected tolerance zone symbol (used in a feature control frame) In geometric dimensioning and tolerancing , a projected tolerance zone is defined to predict the final dimensions and locations of features on a component or assembly subject to tolerance stack-up .
A tolerance interval (TI) is a statistical interval within which, with some confidence level, a specified sampled proportion of a population falls. "More specifically, a 100×p%/100×(1−α) tolerance interval provides limits within which at least a certain proportion (p) of the population falls with a given level of confidence (1−α)."