Michael Press wrote:
> In article
> <[email protected]>,
> "JeffWills" <[email protected]> wrote:
>
>
>>Ben Munson wrote:
>>
>>>Thanks in advance,
>>>Ben "I may have overtensioned" Munson
>>
>>If you thing it's over-tensioned, stress-relieve the wheel by putting
>>it on the floor and pressing down on opposite sides of the rim. If it
>>"sproings" into a potato-chip shape, it's overtensioned. Back off the
>>tension two turns and start truing again. Final tension should be less
>>than the amount that potato-chipped the wheel.(This is Jobst's method-
>>it works for me.)
>
>
> This is not stress relieving. The `sproings' sound is the
> sound made by spokes untwisting that were wound up when
> turning the nipples with the spoke wrench.
>
> Stress relieving is not accomplished by pushing the rim
> parallel to the axle. Not enough additional tension can be
> put on the spokes in this way. The way to add enough
> momentary tension to the spokes to plastically deform them
> at the elbow and at the nipple is to squeeze them together
> after they have been brought up to final tension.
>
"not enough additional tension can be achieved"? as opposed to
squeezing by hand? are you serious? didn't we all have this discussion
before and conclude that the degree of tension increase achievable by
squeezing [apart from being /highly/ subjective and variable] was not
any different from the rim press method?
as for whether either are capable of metallurgical "stress relief",
iirc, the "best" defense of the spoke squeeze method was some
conveniently unresearched unproven lamo excuse about "only microscopic
residually stressed areas yield" when questioned about why the typically
required 1-2% yielding was not being achieved. conveniently ignoring of
course the requirement that metallurgical stress relief is required
immediately after forming, not the weeks or months later that a builder
gets around to taking the spokes out of their box. [and let's also
ignore the significant impact on fatigue of other factors such as the
use of modern vacuum degassed steels.]
bottom line; there's no reason why munson's method won't work. after
all, the spokes only need to be bedded in, and this method /does/ raise
tension sufficiently for bed-in to occur. and this /is/ the textbook
method proscribed by mavic. why pay attention to mavic? well, [rumor
has it] they dump more than a buck or two into r&d and have done so for
nearly 80 years. i have no idea why they bother when all they need to
do is buy a book from a guy that doesn't know a damned thing about
materials or fatigue but presumes to tell us... no, i'm bored with all
this willful ignorance.