#Din iso 5459 neu code

The datum is the axis of the largest inscribed cylinder of a hole or the smallest circumscribed cylinder of a shaft, so located.that any possible movement of the cylinder in any direction is equalised (see figure 2).Д¤.3 Datum being the common axis or common median plane For lines, use two supports (see figure 1 I and for flat surfaces, use three supports.Д¬ w ! A Datum feature L Datum l- Simulated datum feature = Contacting surface Should thedatum feature not be stable with the contacting surface, suitable supports should be placed between them at a practical distance apart. The datum feature shall be arranged in such a way that the maximum distance between it and the simulated datum feature has the least possible value. The following methods are examples for establishing datums.Д¤.1 Datum being a straight line or a plane These may take the form of convex, concave or conical deviations. ,Features indicated as datums have inherent inaccuracies resulting from the production process. (Revision of GO/R 1101/l-1969.)Д¤) At present at the stage of draft. (Revision of GO/R X29-1959.)ДЈ) At present at the stage of draft. (Revision of ISO/R 1291959.)Дў) At present at the stage of draft. NOTE - Simulated datum features are used as the practical embodi- ment of the datums during manufacture and inspection.ДЎ) At present at the stage of draft. NOTE - As datum festcres are subject to manufacturing errors and variations, it may be necessan/ where appropriate to specify tolerances of form to them.ДЈ.4 datum target : A point, line or limited area on the work- piece to be used for contact with the manufacturing and inspection equipment, to define the required datums in order to satisfy the functional requirements.ДЈ.5 srmulated datum feature : A real surface of adequately precise form (such as a surface plate, a bearing, or a mandrel, etc.) contacting the datum feature(s) and used to establish the datum(s). Datums may be based on one or more datum features of a part.ДЈ.2 datum-system : A group of two or more separate datums used as a combined reference for a toleranced feature.ДЈ.3 datum feature : A real feature of a part (such as an edge, a surface, or a hole, etc.), which is used to establish the location of a datum. 5,ДЈ.1 datum : A theoretically exact geometric referencefsuch as axes, planes, straight lines, etc.) to which toleranced features are related. IS0 7083, Techical drawings - Symbols for geometical tolerencing - Proportions and dimensions. IS0 2692, Technical drawings - Geometrical tolerencing - Maximum material principle. ,lSO 1101, Technical drawings - Geometrical tolerancing - Tolerances of form, orientation location and run-out - Generalities, definitions, symbols, indications on drawings. IS0 129, Engineering drawings - Dimensioning. IS0 128, Technical drawings - Genera/principles of presenta- tion. This International Standard describes datum and datum- systems for geometrical tolerancing, their definitions, practical embodiments and their indications on technical drawings in the field of mechanical engineering. It should be understood that the third angle projection could equally well have been used without prejudice to the principles established.ДЇor the definitive presentation (proportions and dimensions) of symbols for geometrical tolerancing, see IS0 7083. 18ДЇor uniformity all figures in this International Standard are in first angle projection. Onsortium for internal use by subscribing m There is no Indian Standard corresponding to IS0 7083 to which reference is made in 2.Д«UREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG Part 2 Maximum material prislciptes (Technically equivalent) IS : 8000 (Part 2) - 1976 Tokances of fbrmДЄnd of position for engineering drawings. Part 1 Generalities, symbols, indications on

#Din iso 5459 neu code

IS : 896-1912 Code of practice for generalД®ngineering drawings (second revision) (Tech- nically equivalenfi)ДЎ.S : 8000 (Part 1) - 1976 Toterances of form and of position for engineering drawings : Sentation in technical drawings (Identical) IS : 10714-1983 General principles of pre. Wherever the words International Standard appear, referring to this standard, they

Tution on recommendation of the Drawings Sectional Committee and approved by the Engineering International Organization for Standardization (ISO), was adopted by the Jndian Standards Insti.

Metrical tolerancing - Gatums and datum-systems for geometrical tolerances,issued by the This [ndien Standard, which is identical with IS0 5459-1981 Technical drawings -Geo. (IS0 Title : Technical Drawings - Geometrical Tolerancing - Datums and Datum-Systems fo7 Geometrical Tolerances) DATUM AND DATUM SYSTEMS FOR, GEOMETRICAL TOLERANCING ON