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A compound shalt coupling having a flexible disk shaft, with two flexible disks or diaphragms, and a tie bolt shaft connecting two rigid or stiff shafts. One flexible disk diaphragm of the flexible disk shaft is coupled with an interference fit to the first stiff shaft, while the other flexible disk

A compound shalt coupling having a flexible disk shaft, with two flexible disks or diaphragms, and a tie bolt shaft connecting two rigid or stiff shafts. One flexible disk diaphragm of the flexible disk shaft is coupled with an interference fit to the first stiff shaft, while the other flexible disk diaphragm of the flexible disk shaft is coupled with an interference fit to the tie bolt shaft which removably mounts the second stiff shaft. A quill shaft connects the two flexible disk diaphragms of the flexible disk shaft. The first stiff shaft can be a hollow sleeve with a magnet mounted therein and the second stiff shaft or power head shaft may include a compressor wheel, a bearing rotor, and a turbine wheel removably mounted on the tie bolt shaft.

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[ What we claim is:] [1.] A method of coupling a first stiff shaft with a second stiff shaft comprising the steps of:providing a tie bolt shaft having a generally cup shaped member at one end thereof and a threaded nut at the other end thereof;providing a flexible disk shaft between said first stiff

[ What we claim is:] [1.] A method of coupling a first stiff shaft with a second stiff shaft comprising the steps of:providing a tie bolt shaft having a generally cup shaped member at one end thereof and a threaded nut at the other end thereof;providing a flexible disk shaft between said first stiff shaft and said tie bolt shaft, said flexible disk shaft having a pair of flexible disks and a quill shaft disposed between and connecting said pair of flexible disks,interference fitting one of said pair of flexible disks of said flexible disk shaft directly with said first stiff shaft;interference fitting the other of said pair of flexible disks of said flexible disk shaft directly within the cup shaped member of said tie bolt shaft, andcompressively mounting the second stiff shaft on said tie bolt shaft between said generally cup shaped member and said threaded nut to stretch said tie bolt and increase the direct interference fit between the other of said pair of flexible disks of said flexible disk shaft and the cup shaped member of said tie bolt shaft.