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Tolerancing Vocab 1

TermDefinition
Actual Size the measured size of an object
Allowance the intentional difference in the dimensions of mating parts to provide for different classes of fits
Basic Dimension an exact untoleranced value used to describe the size, shape, or location of a feature
Basic Size the size of a part determined by engineering and design requirements
Chain Dimensioning a dimensioning system in which successive dimensions are placed in a "chain" from point to point to locate features, rather than each originating at a datum. AKA point-to-point dimensioning
Datum a point, line or surface assumed to be exact size and shape, and in an exact location for establishing the location of other features.
Datum Dimensioning a dimensioning system in which every feature of a part is dimensioned from a common point or plane.
Design Size the size of a feature after an allowance for clearance has been applied and tolerances have been assigned.
Feature Control Frame a compartment containing divided areas for specifying a geometric tolerance for a feature.
Fit a general term referring to the range of "tightness" between mating parts.
Form Tolerances Tolerances that control or the geometric shape of features of a part.
Bilateral Tolerances allow variations in both directions from a design size
Lay the direction of the predominant surface pattern of a part.
Least Material Condition (LMC) a condition that is present when a feature contains the least amount of material within the tolerance range.
Reference Dimension an untolerated dimension placed on a drawing for the convenience of engineering and manufacturing personnel
Limits the extreme dimensions allowed by a tolerance range.
Tolerance the total amount of variation permitted from the design size of a part.
Unilateral Tolerances allow variations in only one direction from the design size.
Clearance Fit has a positive allowance or "air space."
Interference Fit has a negative allowance or "interference."
Transition Fit the limits of size are defined so that the result may be either a clearance fit or interference fit.
Basic Hole Size the basic size of the hole is the design size, and the allowance
Basic Shaft Size the design size of the shaft is the basic size and the allowance is applied to the hole.
Limit Dimensioning only the maximum and minimum dimensions are given.
plus and minus tolerancing the tolerances are generally placed to the right of the specific dimension
running & sliding fit fit that allows ease of movement. Designated by RC1- RC9
Locational Fit relate to the location of mated parts. Designated by LC, LT & LN symbols
Force Fit designed to describe pressures between mating parts. AKA Force Fit. Designated by FN1- FN3
Created by: scwoolard
 

 



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