Swaging questions

[Brion Toss]

Hello,
Oh, dear. As far as I know, only Wire Technic (sp?) swages are suited for single-pass swaging; standard Kearneys specifically require two passes, with the second 90? to the first. Yes, this makes for fatigue, but one pass simply doesn't compress enough metal far enough. Make two passes ó and no more than that, or fatigue happens in a bigger way ó unless the machine manufacturer says otherwise.
We see far fewer fatigue problems with rotaries, and the ones we do see are often from machines that have gotten out of spec. This seems to happen rarely with rotaries, and I can only speculate that this is because the much more expensive machine tends to end up with much more careful people. Kind of like being more likely to attend to oil changes with a Rolls than with a Yugo.
Fair leads,
Brion Toss