Geometric dimensioning and tolerancing - Wikipedia.
Description: Profile of a surface describes a 3-Dimensional tolerance zone around a surface, usually which is an advanced curve or shape. If it is called out on a curved surface, like a fillet on a welded part, the entire surface where the radius is has to fall within the tolerance zone.
GEOMETRICAL TOLERANCING Introduction. definition of what constitutes a functionally good part. Geometrical and Dimensional Tolerances. When tolerances of position, profile or angularity are specified for a feature, the ideal position or angle is defined by theoretically exact dimension.
Profile tolerances can be state by two tolerance zone. These are Line Profile and Surface Profile. Profile Tolerance can be defined a profile of a line or profile of surface generated by off setting each point on the nominal surface in a direction normal to the nominal surface at that point. A Profile is the outline of an object in a given plane.
As shown in Figure 2, the surface profile tolerance zone between points P and R (along the left side of the door) must lie with the profile boundaries 1 mm apart (defined by the red zone) and equally disposed about the true profile (0.5 mm on each side). Thus, the feature must be located within the tolerance zone of 1 mm, relative to the datum reference frame ABC.
The tolerance zone of a profile tolerance is defined by (tangential) envelopes on circles (profile tolerance of a line), or on spheres (profile tolerance of a surface) whose diameters are equal to the tolerance value and centered on the nominal form. Therefore, the zone is equally disposed on either side of the nominal profile.
The passive acceptance of social and governmental practices, policies and actions which restrict freedom in an absolute sense. The Frankfurt School theorist Herbert Marcuse coined the term in an essay of that title for a book co-written with Robert Wolff and Barrington Moore, Critique of Pure Tolerance (1965). Repressive tolerance, Marcuse argues, takes two main forms: (i) the unthinking.
Figure 12-14 A feature controlled with composite profile tolerancing The profile in Fig. 12-14 must fall within the .010 tolerance zone governing size, form, and orientation to datum feature A. The entire profile, however, may float around within the larger tolerance zone of .040 located to datum features B and C.
Profile of a line and profile of a surface are tolerances that specify deviation from a curved or non-straight line. These are usually called out in drawings to ensure their profile stays the same.
The tolerance zone is limited by two parallel planes a specified distance apart and disposed symmetrically to the median plane with respect to the datum axis or datum plane. Positional: Positional tolerance is a three-dimensional geometric tolerance that controls how much the location of a feature can deviate from its true position.
A new symbol, circle U, was added to profile tolerance. In the past, a design engineer wanting to specify an unequal profile tolerance on the drawing would draw a chain line in the applicable area.
This document is a geometrical product specification (GPS) standard and is to be regarded as a general GPS standard (see ISO 14638 ). It influences chain links A, B and C of the chain of standards on form, orientation, location and run out. The ISO GPS Masterplan given in ISO 14638 gives an overview of the ISO GPS system of which this document.
Tolerance synthesis is regarded as a tolerance allocation and a tolerance optimization method taking into account manufacturing and inspection aspects. The tolerancing process is defined through all the activities involved by geometric product variations management. We can propose four classical activities.
Surface profile: Surface profile tolerance is the allowed maximum deviation of an outline from the true one.
