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I'm talking about this one. On what principle does it work? The only thing i can think of is that you press the shaft with the screws and then it works based on friction but I have no idea if it is correct.

  • $\begingroup$ What sort of flexing do you expect? Do you think this might be to reduce vibration? $\endgroup$ – Solar Mike Feb 5 at 7:29
  • $\begingroup$ I don't expect any flexing, just wondering on what basis does the input shaft turn the coupling. $\endgroup$ – user1477107 Feb 5 at 7:38
  • $\begingroup$ By the helix... $\endgroup$ – Solar Mike Feb 5 at 8:06
  • $\begingroup$ You don't understand my question... why doesn't the motor shaft just spin inside the coupling? What connects the shaft and the coupling? $\endgroup$ – user1477107 Feb 5 at 8:14

Those four screws are usually tightened against a flat or flats machined on the two shafts.

That prevents any slipping and possible damage to either shaft.

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