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Find coupling is one of the important work machine installation. It is designed in the machine at work so that the driving shaft and driven shaft shaft center line on the same straight line. It is related to whether the machine precision in normal running, the high speed operation of the machine is particularly important.

Both the absolute accuracy of about is difficult to achieve, the continuous operation of the machine requires always maintain accurate on more difficult. In all parts of the uneven heat expansion, shaft bending, bearing the uneven abrasion machine, the displacement and the uneven subsidence of foundation, are not easy to keep the shaft on the reason. Therefore, in the design of machine set shaft center has an allowable deviation value, which is also installed the coupling when needed. From the assembly point of view, as long as you can guarantee the safe and reliable transmission of torque coupling, shaft center deviation value heals big, installation is easy to meet the requirement. But from the installation quality perspective, a center line deviation of smaller, more precise machine on, work better, longer service life. So, cannot take the coupling installation shafts of allowable deviation as installer hasty construction allowance