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GB/T 1184-1996: Geometrical tolerancing. Geometrical tolerance for features without individual tolerance indications Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure GB/T 1184: Historical versions
Similar standardsGB/T 1184-1996: Geometrical tolerancing. Geometrical tolerance for features without individual tolerance indications---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT1184-1996 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Eqv ISO 2768-2.1989 Replacing GB 1184-80 Geometrical tolerancing - Geometrical tolerance for features without individual tolerance indication Issued on. DECEMBER 18, 1996 Implemented on. JULY 01, 1997 Issued by. China State Bureau of Technical Supervision Table of ContentsForeword... 3 ISO Foreword... 4 1 Scope... 5 2 Normative references... 5 3 Definitions... 5 4 General... 5 5 Without individual tolerance indication... 6 6 Indications on drawings... 8 7 Noted tolerance... 9 8 Rejection... 9 Annex A (informative) Concepts and explanation of geometrical tolerancing feature without individual tolerance indications... 10 Annex B (informative) Stipulation for the noted tolerance on the drawing... 16ForewordThis Standard is an amendment of GB 1184-80 Geometrical tolerance -- Geometrical tolerance for features without individual tolerance indications, according to international standard ISO 2768-2.1989 General geometrical tolerance - Part II. Geometrical tolerances for features without individual tolerance indications. This Standard is equivalent to ISO 2768-2 technically. This Standard is equivalent to ISO 2768-2, and at the same time, keeps the stipulation of GB 1184 about noted tolerance value considering the practicability of the standard as annex B; it is combining two annexes of ISO 2768-2 as one annex A. Compared with the year-1980 standard, this Standard has significant difference. all the listed items without individual tolerance indications, classification of the tolerance grade AND tolerance for features without individual tolerance indications are conforming to ISO 2768-2; so it is completely different to the previous GB 1184-80 value system. This Standard mainly contains definition, geometrical tolerance -- geometrical tolerance for features without individual tolerance indications, indications on drawings, tolerance for features without individual tolerance indications in special occasions AND geometrical tolerance with individual tolerance indication. This Standard shall be implemented from July 01, 1997, at the same time, it replaces GB 1184-80. The Annex A and Annex B are for information only. This Standard was proposed by Ministry of Machinery Industry of P. R. China. This Standard shall be under the jurisdiction of National Tolerance and Fits Standardization Technical Commission. Drafting organization of this Standard. Mechanical Standardization Institute of Ministry of Machinery Industry of P. R. China. Drafters of this Standard. Zhou Zhong and Wang Kai.ISO ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern-mental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 2768-2 was drafted by Technical Committee ISO/TC 3, Limits and fits. This first edition of ISO 2768-2, together with ISO 2768-1, cancels and replaces ISO 2768.1973. ISO 2768 consists of the following parts, under the general title General tolerances. - Part 1.Tolerances for linear and angular dimensions without individual tolerance indications - Part 2.Geometrical tolerances for features without individual tolerance indications Annexes A and B of this Standard of ISO 2768 are for information only. National Standard of the People’s Republic of China Geometrical tolerancing - Geometrical tolerance GB/T 1184-1996 for features without individual tolerance indication eqv ISO 2768-2.1989 Replacing GB 1184-801 ScopeThis Standard mainly applies to features which are produced by removal of material. Its application to features manufactured by other processes is possible; however, special examination is required to ascertain whether the customary workshop accuracy lies within the without individual tolerance indications specified in this Standard.2 Normative referencesThe following standards contain the provisions which, through the reference in this text, constitute the provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. GB/T 1182-1996 Geometrical tolerancing - Generalities, definitions, symbols, indications on drawings GB/T 1804-92 General tolerances - Tolerances for linear dimensions without individual tolerance indications GB/T 4249-1996 Tolerancing principle3 DefinitionsFor the purposes of this Standard, the definitions for geometrical tolerances given in GB/T 1182 apply.4 GeneralWhen selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration. If smaller geometrical tolerances are required or larger geometrical tolerances are permissible and more economical for any individual feature, such tolerances should be indicated directly in accordance with GB/T 1182.5 Without individual tolerance indication5.1 Geometrical tolerances for features without individual tolerance indications 5.1.1 Straightness and flatness The without individual tolerance indications on straightness and flatness are given in Table 1.When a tolerance is selected from Table 1, it shall be based, in the case of straightness, on the length of the corresponding line and, in the case of flatness, on the longer lateral length of the surface, or the diameter of the circular surface. 5.1.2 Circularity The without individual tolerance indications on circularity are equal to the numerical value of the diameter tolerance, but in no case shall it be greater than the respective tolerance value for circular radial run-out given in Table 4 (see figure A.2 in Annex A (for reference)). 5.1.3 Cylindricity The without individual tolerance indications on cylindricity are not specified. 5.2 Without individual tolerance indications of geometric tolerance 5.2.1 Parallelism The without individual tolerance indication on parallelism is equal to the numerical value of the size tolerance or the flatness/straightness tolerance, whichever is the greater. 5.2.2 Perpendicularity The without individual tolerance indications on perpendicularity are given in Table 2.The longer of the two sides forming the right angle shall be taken as the datum; if the sides are of equal nominal length, either may be taken as the datum. 5.2.3 Symmetry The without individual tolerance indications on symmetry are given in Table 3. The longer of the two features shall be taken as the datum; if the features are of equal nominal length, either may be taken as the datum. 5.2.4 Coaxiality Without individual tolerance indications on coaxiality are not specified. Coaxiality tolerance can be equal to the radial circular run out tolerance stipulated in Table 4 at limit conditions. Select the longer one as reference from these two features; if the length of these two features are same, select anyone as reference. 5.2.5 Circular run-out The without individual tolerance indications on circular run-out (radial, axial and any surface of revolution) are given in Table 4.Annex A(informative) Concepts and explanation of geometrical tolerancing feature without individual tolerance indications A.1 Concepts and marking behind without individual tolerance indications of geometrical tolerance The unnoted tolerance which conform to factory normal accuracy grade need not marked on the drawing; some feature required by the function reason smaller than “unnoted tolerance” is not belonging to the unnoted tolerance category, it should be noted according to the stipulation of GB/T 1182; If the function requirements allows the tolerance bigger than unnoted tolerance, and this bigger tolerance can bring economic benefit to the factory, this bigger geometrical tolerance should be noted on the feature separately. For example, metal thin wall part, flexible material part (like rubber part and plastic part) etc. A.2 Above a certain tolerance value, which corresponds to the customary workshop accuracy, there is usually no gain in manufacturing economy by enlarging the tolerance. A.3 Using without individual tolerance indications leads to the following advantages. A.4 The workshop should, therefore, A.5 Rejection The tolerance the function allows is often greater than the without individual tolerance indication. The function of the part is, therefore, not always impaired when the without individual tolerance indication is (occasionally) exceeded at any feature of the work piece. Exceeding the without individual tolerance indication should lead to a rejection of the work piece only if the function is impaired. A.6 Application range of geometrical tolerance unnoted tolerance Unnoted tolerance of geometrical tolerance is applicable to the part feature which is abide by independent principle; to some part features abide by envelope principle requirement and to some features with maximum material dimension anywhere(see example in figure A1). A7 Example of roundness unnoted tolerance Example please see Figure A2. Example 1, circle feature diameter tolerance is noted 25 0 1.0, roundness unnoted tolerance is 0.1. Example 2, circle feature diameter adopts unnoted tolerance, which is conform to GB/T 1804 m grade. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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