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ISO 13050:2014 pdf free

ISO 13050:2014 pdf free.Synchronous belt drives – Metric pitch, curvilinear profile systems G, H, R and S, belts and pulleys
This International Standard specifies the principal characteristics of metric pitch curvilinear synchronous endless belts and pulleys in G, H, R, and S profile systems for use in synchronous belt drives (also known in the past as timing belt drives, positive belt drives, gear belt drives) for mechanical power transmission and where positive indexing or synchronization might be required.The principal belt and pulley characteristics include the following:
a) nominal belt tooth dimensions;
b) belt tooth pitch spacing;
c) belt length and width dimensions and tolerances;
d) belt length measurement specifications;
e) pulley groove dimensions and tolerances;
f) pulley diameter and width dimensions and tolerances;
g) pulley quality specification.
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 254, Belt drives一Pulleys一Quality, finish and balance
See Annex A for tolerances and Annex B for the relationship between the centre distance and the belt pitch length.
The pitch length of a synchronous belt shall be determined by placing the belt on a measuring fixture composed of the following elements.
Two pulleys of equal diameter, as specified in Table 3, of the proper belt profile and having standard tooth space dimensions. These pulleys should be made to the tolerances shown in Table 3. One pulley shall be free to rotate on a fixed-position shaft, while the other shall be free to rotate on a moveable shaft to permit the centre distance to change.
In measuring the pitch length of a synchronous belt, the belt should be rotated at least two revolutions to seat it properly and to divide the total force equally between the two spans of the belt. The pitch length shall be calculated by adding the pitch circumference of one of the pulleys to twice the measured centre distance.ISO 13050 pdf download.

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