ASME B29.300:2015 pdf download

ASME B29.300:2015 pdf download.Agricultural, Detachable, and Pintle Chains, Attachments, and Sprockets
1 DEFINITIONS
link: a one-piece steel link consisting of end bar A, hook B, and two sidebars C-C (see Fig. 2 of B29.6). measuring load: the load under which a dry or lightly lubricated chain should be measured for length. steel detachable link chain: a series of successively assem- bled steel links in which the end bars articulate inside the hook. The chain is detached by flexing it and driving the end bar out of the adjoining hook (see Fig. 1 of B29.6).
3 GENERAL CHAIN PROPORTIONS AND DESIGNATIONS
3.1 Minimum Ultimate Tensile Strength The Minimum Ultimate Tensile Strength (M.U.T.S.) for chain covered by this Standard is the minimum force at which an unused, undamaged chain could fail when subjected to a single tensile loading test. WARNING: The Minimum Ultimate Tensile Strength is NOT a “working load.” The M.U.T.S. greatly exceeds the maximum force that may be safely applied to the chain. (a) Test Procedure. A tensile force is slowly applied, in a uniaxial direction, to the ends of the chain sample. (b) The tensile test is a destructive test. Even though the chain may not visibly fail when subjected to the M.U.T.S., it will have been damaged and will be unfit for service. CAUTION: This load is beyond the yield strength of the chain and would render the chain unsuitable for application. (c) For application guidance, consult the manufactur- ers’ catalogs or the American Chain Association’s hand- book, Chains for Power Transmission and Material Handling.
5 SPROCKETS
5.1 General Information Sprockets for use with steel detachable chains are usu- ally made of cast or wrought ferrous material. Wear resistance is frequently designed into the material of the tooth faces. Sprocket bodies are of many configurations (e.g., plate, arm, web, flat, or dished). When hubs con- taining the sprocket mounting bore are employed, they may project from either side or from both sides of the sprocket body. This Standard covers only the dimensions controlling the surfaces thatmustproperlyengage orclearthe chain. Dimensions are given in a decimal inch system. The metric dimensions given are recommended conversions from the decimal inch system. In some cases the conver- sion is not exact; the decimal inch system is therefore to be taken as the base control dimension. Sprockets with standard tooth forms are capable of transmitting chain loads in systems operating under a wide variety of conditions such as the following combination: (a) maximum peak tension in chain as great as 0.20 of the ultimate breaking strength of the chain; (b) slack strand tensions as small as 0.25% of the working tension in the chain; (c) friction between the chain and the sprocket tooth faces as low as 10%; and (d) the number of chain links in contact with the periphery of the sprocket as few as 0.5 ? (N − 1). Individually, the above limits are not absolute. Varia- tions may be accepted in each of them provided com- mensurate modifications are made in other limits. 5.2 Sprocket Tooth Form The elements of the tooth profiles for sprockets for standard chains are given in Fig. 3 and Tables 14 and 15 of B29.6. Maximum tooth thickness t may not exceed (0.95 D minus actual sideface oscillation), where D equals hook width of chain.