Standard tolerances and fundamental deviations, tolerances, with a limit of deviation differences and connections

National standards of limits and fits under any public difference, that size has been standardized tolerance values?, called the standard tolerances.

A certain size (actual size limit size) minus its basic dimensions obtained algebra is called skew. The deviation can be divided into actual bias and limit deviations.

The upper deviation and lower deviation collectively referred to as the limit deviations. The difference may be positive, negative or zero refers to the maximum or minimum limit size minus the basic dimensions obtained algebra poor. From the effects, the limit deviation is used to limit the actual deviation, which represents the position of the tolerance band, with the degree of tightness of the impact; tolerances for limiting the size of the error, it represents the size of the tolerance band, influence with precision. The deviation depends on the adjustment of the machining, and reflects the degree of difficulty of machining tolerances. Tolerances and limit deviations are different, but related, tolerance, said the range allowed by the number of workpiece size, workpiece size precision indicators, limit deviations workpiece size allows changes in the limit, is qualified to judge whether the size of the workpiece basis . Actual deviation limit deviation range, the parts are qualified products.

Determine that limit deviation tolerance with the relative position of the zero line called basic deviation. It can be on a deviation or lower deviation, generally close to the zero line of the deviation.

Represents the size of the parts relative to its basic dimensions allowed by the range of the movement is known as the tolerance band. FIG represented by the tolerance band, referred to as a tolerance zone FIG.

Contact: Tolerance band includes two elements of the tolerance zone size and tolerance position tolerance zone size is determined by the tolerance value depends on a certain limit deviation tolerance position. Must be given both tolerance values to determine the tolerance zone size, but also given a limit deviation to determine the location of the tolerance zone, in order to fully describe the tolerance zone, and expression of the design requirements of the workpiece size.

Common tolerance zone limit deviations (microns)

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