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I have a motor which its output shaft has a key, and it will be connected to a wheel/tyre. I'm wondering how can I lock the hub axially, so there is no way it can move freely along the axis, which could mean that eventually the wheel-tyre could go off. I'm not sure if a split coupling with a keyway a could work, but I doubt it's designed to press the key and restrict axial movement. Any ideas/suggestions, thanks :)

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  • $\begingroup$ Are there provisions for a set screw with the key? A shoulder on one face and a retaining ring opposite can work. $\endgroup$ – jko May 1 '20 at 16:47
  • $\begingroup$ I think it's not meant to be used with a set screw. this is the motor/gearbox in question. I'm sorry, I'm not an English native, so I'm not familiar with the English terms in ME. By shoulder, do you mean a geometric restriction to movement? If so, I'll probably go that route, along with a retaining ring. $\endgroup$ – pollitoalabrasa May 1 '20 at 17:06
  • $\begingroup$ If your wheel has a hub where you can fit a threaded hole, a set screw can be used. If you have access to Machinery's Handbook it has all the dimension information you need. Your interpretation of shoulder is correct, kudos. $\endgroup$ – jko May 1 '20 at 17:22
  • $\begingroup$ Use a taper-lock system - often found on pulleys. $\endgroup$ – Solar Mike May 1 '20 at 17:27
  • $\begingroup$ @jko It will be a custom hub, so I could include that. So, the set screw will be tightened against the face of the key, is that what you mean? $\endgroup$ – pollitoalabrasa May 1 '20 at 17:36
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In modern automobiles, this age-old problem has been solved by using flanged coupling between wheel and driveshaft (This also facilitates easy Stepney replacement).

The reduction box in your comment led me to do some google searches. I found this enter image description here This is split-half coupling a standard component in boats. Since it doesn't come very cheap I would suggest to make CAD to your required dimensions 3D print it and then use grub/set screws instead of a key.

Do let me know if there are any issues

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