Search results
Results From The WOW.Com Content Network
Shelford's law of tolerance is a principle developed by American zoologist Victor Ernest Shelford in 1911. It states that an organism 's success is based on a complex set of conditions and that each organism has a certain minimum, maximum, and optimum environmental factor or combination of factors that determine success. [ 1 ]
Engineering tolerance is the permissible limit or limits of variation in: a physical dimension ; a measured value or physical property of a material, manufactured object, system, or service;
The tolerance zone is made of twice the space between two parallel opposite planes spaced with tolerance value apart. The indication CZ implies that we shall apply location and orientation constraints between the tolerance zones. The value of the constraints are to be taken from the drawing using explicit or implicit theoretical exact dimensions.
Example of true position geometric control defined by basic dimensions and datum features. Geometric dimensioning and tolerancing (GD&T) is a system for defining and communicating engineering tolerances via a symbolic language on engineering drawings and computer-generated 3D models that describes a physical object's nominal geometry and the permissible variation thereof.
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 .
Note: in this context, IT does not mean Information Technology, but it is an Engineering term. An IT grade is an internationally accepted code system for tolerances on linear dimensions. Such code systems may be used to produce interchangeable parts. In engineering, the word tolerance refers to a range of allowable dimensions or values ...
Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. In engineering terms, the "fit" is the clearance between two mating parts, and the size of this clearance determines whether the parts can, at one end of the spectrum, move or rotate independently from each other or, at the other end, are temporarily or permanently joined.
Tolerance to other climatic factors are often omitted from the "hardiness" discussion. This section provides a very brief overview of the topics. Heat tolerance may be displayed alongside cold-hardiness, such as in the American Horticultural Society's "Heat Zones". See Thermoregulation § In plants and Breeding for heat stress tolerance.