Use a straight edge to measure the coaxiality error of the coupling, and use a plug gauge to measure the parallelism error of the coupling.This method is simple, but the error is large.Generally used for machines with low speed and low precision requirements.

　　Use two dial gauges to measure the outer circle and the end face of the coupling hub, calculate and analyze the measured values, determine the position of the two shafts in space, and obtain the adjustment amount and adjustment direction.This method is widely used.The main disadvantage is that for machines with axial movement, errors will occur in the end-face measurement readings during cranking.It is generally used in small and medium-sized machines with rolling bearings and small axial movement.

　　This method uses two dial gauges on the end face, and the two dial gauges are set symmetrically at the same distance from the shaft center to eliminate the influence of axial movement on the end face measurement readings. This method has high accuracy and is suitable for needs. Centering precision machines and high-speed machines.Such as: steam turbine, centrifugal compressor, etc.

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