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Leaf chains are actually steel chains with a simple pin construction and link plate. The chain number refers to the pitch and the lacing of the links. The chains have particular features like high tensile strength per section area, which enables the design of smaller mechanisms. There are A- and B- kind chains in this particular series and both the BL6 and AL6 Series contain the same pitch as RS60. Finally, these chains cannot be driven using sprockets.
Comparably, in roller chains, all of the link plates have higher fatigue resistance because of the compressive stress of press fits, while in leaf chains, just two outer plates are press fit. The tensile strength of leaf chains is high and the most allowable tension is low. Whenever handling leaf chains it is essential to confer with the manufacturer's guidebook to be able to guarantee the safety factor is outlined and utilize safety guards all the time. It is a good idea to exercise utmost caution and use extra safety measures in functions wherein the consequences of chain failure are serious.
Using much more plates in the lacing results in the higher tensile strength. As this does not improve the maximum allowable tension directly, the number of plates utilized could be restricted. The chains need regular lubrication as the pins link directly on the plates, producing a very high bearing pressure. Using a SAE 30 or 40 machine oil is normally suggested for the majority of applications. If the chain is cycled more than 1000 times every day or if the chain speed is over 30m per minute, it will wear extremely quick, even with constant lubrication. Therefore, in either of these conditions utilizing RS Roller Chains would be much more suitable.
The AL-type of chains must only be used under certain situations like for instance when wear is really not a huge concern, if there are no shock loads, the number of cycles does not exceed 100 each day. The BL-type will be better suited under other conditions.
If a chain using a lower safety factor is selected then the stress load in components will become higher. If chains are utilized with corrosive elements, then they could become fatigued and break rather easily. Doing regular maintenance is really important when operating under these kinds of situations.
