BS ISO 3764:1997 pdf free download.timekeeping instruments Movements – Forms dimensions and nomenclature.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of BS ISO 3764. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on BS ISO 3764 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 286-1:1988, ISO system of limits and fits — Part 1: Bases of tolerances, deviations and fits. ISO 6426-2:[984, Horological vocabulary — Part 2: Techn ico-com mercial defin it ions.
3 Definitions and symbols
For the purposes of BS ISO 3764, the definitions given in ISO 6426-2 and the following definitions and symbols apply.
3.1 Diameters of movement
3.1.1
fitting diameter, d1
diameter of a plate or an equivalent part or an assembly unit by which the movement is based in the watch case
NOTE The protruding elements of parts are not included in the fitting diameter if the protrusion does not exceed 1,5 % of a diameter value and if in length they are no more than 10% of the plate perimeter.
3.1.2
outer diameter, d,
largest diameter of the movement by the bearing collar of a plate, by an equivalent part or by an assembly unit
3.2 Thicknesses of movement
3.2.1 Mechanical type
3.2.1.1
total thickness of the movement, l thickness covering all the movement parts. including the distance between the dial support surface of the movement and the lowest protruding part of the movement
3.2.2 Electromechanical type
3.2.2.1
total thickness of the movement without a
battery, l
thickness covering all the movement parts; i.e. the distance between the dial support surface of the movement and the lowest protruding part of the movement
3.2.2.2
total thickness of the movement with a
battery, ‘2
distance between the dial support surface of the movement and the lower battery surface
NOTE If the battery is not the most protruding part, the total movement thickness is determined as i.
3.2.2.3
total thickness of the movement including a battery and its fastening clamp, 13
distance between the dial support surface of the movement and the lower surface of the clamp
NOTE 1 If the battery with its clamp is not the most protruding part, the total movement thickness is determined as 11. NOTE 2 For watches with analog indication, the total thickness of the movement does not include the thickness of the geartrain consisting of an hour wheel, a cannon and a centre second pinion, hand-fastening elements and the elements of earthing to a case.
4 Nomenclature of movements and their dimensions
4.1 Type 1: Circle movement See Figure 1 and Table 1.
5 Nomenclature for thicknesses of
movements
5.1 Mechanical movements
See Figure 5 .