Does it matter if the diameters of the motor shaft and the pump shaft are different when aligning a pump?
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The data measured at different locations is different
The diameter of the motor shaft is originally different from that of the pump shaft. Moreover, alignment refers to the axis centerlines of the pump shaft and the motor shaft, and it has nothing to do with thickness; the outer diameters of the coupling wheels are the same
It doesn’t matter; it’s mainly about alignment.
It shouldn’t have an impact, but aligning it is rather troublesome
It doesn’t matter; we are targeting the center line, not the outer circle. To correct the issue mentioned above: the outer circles need not be of the same size. Moreover, due to corrosion and erosion, they may not be perfect circles either. But as long as the key principles of alignment are understood, it is still possible to achieve alignment even if the wheels are elliptical in shape. Therefore, it has nothing to do with the different sizes of the two axes involved in alignment, nor with whether the wheels are of the same size, and it’s also unrelated to whether the wheels are round.
The diameter of the motor shaft is different from that of the pump shaft; they are connected through couplings with different inner diameters, and it is sufficient to align the centerlines of the shafts.
I’m only responding to your title: when aligning a mechanical pump, does it matter if the diameters of the motor shaft and the pump shaft are different? It doesn’t matter!
The size of the motor has no impact on finding a concentric pump shaft. The outer circle has suffered from corrosion and erosion; it may not be a perfect circle, so it’s not possible to find four or eight symmetric points to determine the concentric values.
The diameter of the motor shaft is different from that of the pump shaft; they are connected through a coupling, and it is sufficient to align the centerlines of the shafts on the same horizontal level.
As a supplementary point, the clearance of some bearings also affects adjustment, especially in the case of sliding bearings (bushings). An error occurs after rotating it in either direction. For devices that generate heat, there are also special alignment requirements. It should also be noted that the alignment adjustment of the coupling is just one aspect of the connection requirements; the required gap between the coupling components as well as its parallelism must also be taken into consideration. (For reference)