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#1
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Correct Torque value for Presta Valve?
I've seen the light and now use a torque wrench for all threaded
fasteners and bottlecaps. Unfortunately, I have been unable to find the recommended torque spec for the little knurled nuts on my Presta valves. Anybody got a definitive answer? I've been using 0.0000013 ton/furlongs, but I'm not sure that's quite correct... Carapace Completed Umber McMurdo Bay, Ant. +--------------------------------------------+ | If it can't be expressed in figures, | | it is not science; it is opinion. | | --Robert A. Heinlein | +--------------------------------------------+ |
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#2
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Correct Torque value for Presta Valve?
Sheldon Brown wrote:
I've seen the light and now use a torque wrench for all threaded fasteners and bottlecaps. Unfortunately, I have been unable to find the recommended torque spec for the little knurled nuts on my Presta valves. Anybody got a definitive answer? I've been using 0.0000013 ton/furlongs, but I'm not sure that's quite correct... Carapace Completed Umber McMurdo Bay, Ant. I know you're looking for something /quantitative/, Sheldon. I don't have that, but . . . I tighten them with increasing force until a slight hissing can be heard, then back them off 1/16th of a turn. HTH, Neil |
#3
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Correct Torque value for Presta Valve?
"Sheldon Brown" wrote: (clip) I've been using 0.0000013 ton/furlongs, (clip) ^^^^^^^^^^^^^ Where did you find a torque wrench calibrated in ton-furlongs? I spent a micro-century Googling for it and got nowhere. |
#4
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Correct Torque value for Presta Valve?
On Thu, 14 Jul 2005 13:10:32 -0400, Sheldon Brown
wrote: I've seen the light and now use a torque wrench for all threaded fasteners and bottlecaps. Unfortunately, I have been unable to find the recommended torque spec for the little knurled nuts on my Presta valves. Anybody got a definitive answer? I've been using 0.0000013 ton/furlongs, but I'm not sure that's quite correct... Carapace Completed Umber McMurdo Bay, Ant. A torque wrench is not needed if you cross-thread the nut and apply Loctite. Alternately, leave the nut off and crimp a resilient tension flange in place with sleeve band; no sense not using MIL-spec tech in such a critical area. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
#5
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Correct Torque value for Presta Valve?
Neil Brooks wrote: Sheldon Brown wrote: I've seen the light and now use a torque wrench for all threaded fasteners and bottlecaps. Unfortunately, I have been unable to find the recommended torque spec for the little knurled nuts on my Presta valves. Anybody got a definitive answer? I've been using 0.0000013 ton/furlongs, but I'm not sure that's quite correct... Carapace Completed Umber McMurdo Bay, Ant. I know you're looking for something /quantitative/, Sheldon. I don't have that, but . . . I tighten them with increasing force until a slight hissing can be heard, then back them off 1/16th of a turn. Ahh, a new twist to the old rule of thumb: "Crank 'er up until she talks to ya and then back her off a bit" dkl |
#6
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Correct Torque value for Presta Valve?
Sheldon Brown wrote:
I've seen the light and now use a torque wrench for all threaded fasteners and bottlecaps. - snip I've been using 0.0000013 ton/furlongs, but I'm not sure that's quite correct... That can't be correct, Sheldon. ton/furlong is not a unit of torque (which is force through a distance). I can't even figure out what force per distance might be. I'd suggest that 6.31×10^-09 ton furlongs might be about correct John Thurston Juneau, Alaska |
#7
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Correct Torque value for Presta Valve?
wrote: (clip) I can't even figure out what force per distance might be. ^^^^^^^^^^^^^^^^ Suppose you set up a lever, which presses upward on a load at some arbitrary fixed distance from the fulcrum. Now, press down on the lever to create a lifting force on the load. The amount of lifting force will be proportional to the distance from the fulcrum, so you have tons/furlong. What could be more obvious? :-) |
#8
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Correct Torque value for Presta Valve?
On Thu, 14 Jul 2005 13:10:32 -0400, Sheldon Brown
wrote: I've seen the light and now use a torque wrench for all threaded fasteners and bottlecaps. Unfortunately, I have been unable to find the recommended torque spec for the little knurled nuts on my Presta valves. Anybody got a definitive answer? I've been using 0.0000013 ton/furlongs, but I'm not sure that's quite correct... Carapace Completed Umber McMurdo Bay, Ant. +--------------------------------------------+ | If it can't be expressed in figures, | | it is not science; it is opinion. | | --Robert A. Heinlein | +--------------------------------------------+ Dear Sheld--er, Carapace, You could use one of these micro-torque wrenches and experiment with 16-32 inch-ounces: http://www.specialized.net/ecommerce...t%5Fid=176X200 http://www.jensentools.com/product/g...parent_id=4040 That's 1-2 foot-lbs, roughly the same as your 0.0000013 furlong/tons (1.716 ft-lbs @ 1,320,000 ft-lbs per ton/furlong). Thanks for making me finally add furlongs/fortnight and furlong/tons to my conversion spreadsheet. Off to see if I can average 53,760 furlongs/fortnight (20 mph @ 1 mph per 2688 furlongs/fortnight). Just my nickel's worth, Carl Fogel Times-Picayune Help Desk |
#9
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Correct Torque value for Presta Valve?
On Thu, 14 Jul 2005 13:10:32 -0400, Sheldon Brown
wrote: I've seen the light and now use a torque wrench for all threaded fasteners and bottlecaps. Unfortunately, I have been unable to find the recommended torque spec for the little knurled nuts on my Presta valves. Anybody got a definitive answer? See the "Presto!" adaptor for the Tork-Grip pliers on p. 8 of the ShelBroCo catalogue. Fit the adaptor, give the knurled nut five full turns and Presto! (sp?), it's busted. Happy Birthday. "Who can trust a people who celebrate, as their national event, a jailbreak?" - M. Thatcher ------------------------------- John Dacey Business Cycles, Miami, Florida Since 1983 Comprehensive catalogue of track equipment: online since 1996. http://www.businesscycles.com |
#10
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Correct Torque value for Presta Valve?
Leo Lichtman wrote:
wrote: (clip) I can't even figure out what force per distance might be. ^^^^^^^^^^^^^^^^ Suppose you set up a lever, which presses upward on a load at some arbitrary fixed distance from the fulcrum. Now, press down on the lever to create a lifting force on the load. The amount of lifting force will be proportional to the distance from the fulcrum, so you have tons/furlong. What could be more obvious? :-) I know you've got the smiley, but: Since the torque is directly proportional, it'd be ton·furlong. If the relationship had been inversely proportional, then it'd be ton/furlong. I'm course, you probably knew that and I'm probably an ass...but who's counting? -- Paul M. Hobson Georgia Institute of Technology http://www.underthecouch.org ..:you may want to fix my email address before you send anything:. |
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