Great reply! On Mon, Aug 17, 2015 at 7:27 AM, Allingham II, Thomas J <[email protected]> wrote: > I have a spoke tension meter from Park > (http://www.jensonusa.com/!5ZNVsr7o541FBdQt1daMLg!/Park-Tool-TM-1-Spoke-Tension-Meter?utm_source=FRGL&utm_medium=organic&gclid=CKymw4KpsMcCFQUMaQodbTQKYw > ), and the instructions say that you should measure the tension of all > spokes on one side, average them, and then further adjust any spoke that is > more than 20% higher or lower than the average -- that is, adjust the tension > of that spoke toward the average until you get within the 20% range. > > Working by sound? I don't know, and you should probably disregard the rest > of this message, because it's just my guesses and inferences based on the > usual grossly incomplete on-line research. But: > > Obviously, all other things being equal (that is, spoke length and weight, > which should remain constant or close to constant in a wheel -- I suppose > there's a little rim deflection when you change spoke tension, but I assume > it would be trivial), the pitch (what you describe as the tone) increases > with increased spoke tension. But online calculators that give the required > tension for any given note/frequency suggest that the relationship between > pitch and tension is not linear. That is, to increase the pitch by an octave > -- which requires doubling the frequency of the note -- while holding > spoke/string length and weight constant, you have to more than double the > tension. So I think it would be difficult for me to "hear" whether a spoke > is within that 20% range, although I bet more experienced wheelbuilders can > do it with ease. > > FWIW, the Park tensiometer has been, for me, one of the most useful tools > I've purchased, even given its ~$70 price tag. I'm not a very experienced > wheelbuilder (I've probably built fewer than 30 wheels), but the relatively > constant tension that I can assure using the tensiometer, together with the > round and true assurance that comes from a good truing stand, gives me a lot > of comfort that my wheels are sound. > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Toby Whitfield > Sent: Monday, August 17, 2015 9:31 AM > To: RBW Owners Bunch > Subject: [RBW] Wheelbuilding Questions - Even tension > > I just built a new set of wheels, which is the first time in a while for me. > I built a couple a number of years ago, but from old parts as an experiment, > and never really used the wheels, which is all to say I am pretty new at this. > > My question is about tension evenness. I got the wheels up to a pretty high > tension, and they are round and true. > > However, there is some variation in tone when I pluck the spokes. How good is > good enough? If all spokes have pretty good tension, how much variability is > acceptable? I only have tone to guide me. Is a semi-tone or whole tone (for > the musically inclined) of variability ok? > > In some ways, I feel like having good tension and a true wheel should be good > enough, and I notice that sometimes when I push for more perfection in one > area, it can cascade to everything else getting worse. > > For some more background on the build, I used Jobst Brandt's book and > Sheldon's web page to guide me. It is 650b, 36 spoke, Velocity A23 with a > Shimano XT FH-732 rear, and SP SV-8 in the front. I used Sapim DB spokes > (with 14-15-14 for everything except NDS rear which is 14-17-14). > > Thanks! > Toby > Toronto > > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/d/optout. > > ------------------------------------------------------------------------------ > > This email (and any attachments thereto) is intended only for use by the > addressee(s) named herein and may contain legally privileged and/or > confidential information. 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-- Cheers, David Member, Supreme Council of Cyberspace "it isn't a contest. Just enjoy the ride." - Seth Vidal -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
