Shaft Coupling with Spider 3" (Public Domain)

This style of shaft coupling can run you $150 a piece for each individual coupling, not counting the cost of the bronze or rubber spider. Now you can make your own.

The spider absorbs any misorientation of the shaft that could cause a bending-moment in the couplings; the spider will fail instead of the coupling and can simply be replaced, but with good alignment the coupling will last for many years.

This coupling is used often to transmit significant force as well.

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