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What happens to brass spoke nipples during the
stainless-steel spoke-squeezing?
Both are often recommended on rec.bicycles.tech.
For starters, here are some values . . .
36-spoke aluminum rim, aluminum hub
(easy squeezing, used in book and internet models)
295 mm double-butted stainless-steel spoke
(gotta pick some length and model)
1.8 mm mid-section (2.5447 mm^2 cross-section)
(recommended over 2.0 straight spokes)
brass nipples, ???
"Nominal Thread Size 2.2mm x 56 tpi Common 2mm spoke
threading"
http://www.parktool.com/repair_help/thread.shtml
"For the standard 14g (2.0mm) spoke, the thread is 0.080"
diameter, 56 tpi, 60 degree included angle."
http://www.trials-forum.co.uk/forum/index.php?showtopic=30462
100 Kgf (220 pounds) spoke tension
(round number, ballpark value for several manufacturers,
see end of http://www.parktool.com/repair_help/tm_1.shtml,
front averages 80-112 Kgf, r-rear averages 96-132 Kgf)
50 Kgf squeeze (110 pounds)
(a fairly strong single-hand squeeze)
Material Modulus of Modulus of
Elasticity, E Rigidity, G Poisson's
Mpsi GPa Mpsi GPa Ratio
---------------- ---- ----- ----- ----- ---------
Aluminum alloys 10.3 71.0 3.8 26.2 0.334
Brass 15.4 106.0 5.82 40.1 0.324
Stainless steel 27.6 190.0 10.6 73.1 0.305
http://ourworld.cs.com/MJVanVoorhis/techdata/t000.htm
(ballpark figures)
Obviously, all the values above may be high or low. I'm just
wondering what happens to the brass nipples in the aluminum
rim when a stainless steel spoke connecting them to the hub
is squeezed.
Curiously,
Carl Fogel
stainless-steel spoke-squeezing?
Both are often recommended on rec.bicycles.tech.
For starters, here are some values . . .
36-spoke aluminum rim, aluminum hub
(easy squeezing, used in book and internet models)
295 mm double-butted stainless-steel spoke
(gotta pick some length and model)
1.8 mm mid-section (2.5447 mm^2 cross-section)
(recommended over 2.0 straight spokes)
brass nipples, ???
"Nominal Thread Size 2.2mm x 56 tpi Common 2mm spoke
threading"
http://www.parktool.com/repair_help/thread.shtml
"For the standard 14g (2.0mm) spoke, the thread is 0.080"
diameter, 56 tpi, 60 degree included angle."
http://www.trials-forum.co.uk/forum/index.php?showtopic=30462
100 Kgf (220 pounds) spoke tension
(round number, ballpark value for several manufacturers,
see end of http://www.parktool.com/repair_help/tm_1.shtml,
front averages 80-112 Kgf, r-rear averages 96-132 Kgf)
50 Kgf squeeze (110 pounds)
(a fairly strong single-hand squeeze)
Material Modulus of Modulus of
Elasticity, E Rigidity, G Poisson's
Mpsi GPa Mpsi GPa Ratio
---------------- ---- ----- ----- ----- ---------
Aluminum alloys 10.3 71.0 3.8 26.2 0.334
Brass 15.4 106.0 5.82 40.1 0.324
Stainless steel 27.6 190.0 10.6 73.1 0.305
http://ourworld.cs.com/MJVanVoorhis/techdata/t000.htm
(ballpark figures)
Obviously, all the values above may be high or low. I'm just
wondering what happens to the brass nipples in the aluminum
rim when a stainless steel spoke connecting them to the hub
is squeezed.
Curiously,
Carl Fogel