We have several times discussed the differences between coupling alignment tolerances and precision shaft alignment tolerances (see links below). As stated in those text the coupling manufacture’s ...

Installation overview: Even if a coupling is properly selected, poor installation can cause failures, staying within the recommended misalignment ratings of that coupling at installation is critical.

The majority of precision shaft alignments are relatively close coupled where there are only a couple of inches between the shaft ends of the driver and driven elements. Close coupled alignment ...