Envelope Requirement | GD&T Techniques | GD&T Fundamentals …
Chapter 10: Envelope Requirement | Engineering360, Envelope Requirement | GD&T Techniques | GD&T Fundamentals …
Envelope Requirement | GD&T Techniques | GD&T Fundamentals …
Envelope Requirement. The envelope requirement means that the maximum (or minimum) allowable size for a part must be within the same range (or out of the same range) as the maximum size (or minimum size). It specifies that the surface of a single feature of size (a cylindrical surface or a feature established by two parallel opposite plane …
Chapter 10: Envelope Requirement 10.1 Definition The envelope requirement according to ISO 8015 specifies that the surface of a single feature of size (cylindrical surface or a feature established by two parallel opposite plane surfaces) should not violate the imaginary envelope of perfect (geometrical ideal) form at maximum material size.
1/1/2006 · The envelope requirement may be applied to features of size that are to be mated with a clearance fit. Figure 10.2 shows the application of the envelope requirement for a cylindrical feature. The size tolerance requires that the actual local sizes are within the limits of size, see 8.3.1. In addition the envelope requirement is specified.
It is also known as Envelope Principle. This Principle (Rule#1) is based on the premise that a shaft must be able to fit inside a hole which is as deep as the shaft length. In this case the shaft is perfectly cylinder and the shaft in its largest size (MMC).In addition; A bore must be able to receive a shaft which is as long as the hole depth.
surface or a feature established by two parallel flat surfaces. The envelope requirement is used for features which are to be mated. The envelope requirement may be indicated either by the symbol placed after the linear tolerance (Fig. 4,a) or in relevant cases by reference to an appropriate standard which invokes the envelope requirement .
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