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#21
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How can I blacken stainless steel spokes?
Bill Sornson wrote:
Johan Bornman wrote: Nowadays with all the spoke options I am hard-pressed to keep, or indeed, find stock of all the permutations. How do they blacken spokes and can this be done in a workshop as and when needed? Wok with motor oil. Turn on high. destroys their strength. |
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#22
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How can I blacken stainless steel spokes?
Andre Jute wrote:
On May 12, 8:18�pm, Johan Bornman wrote: Nowadays with all the spoke options I am hard-pressed to keep, or indeed, find stock of all the permutations. How do they blacken spokes and can this be done in a workshop as and when needed? You can have the spokes polished and black-chromed . However. chromeplating covers cracks and may even cause them, which is why stressed parts should not be chrome-plated. The same applies to ion-plating, which is good for a matte result. Or you can dip the spokes in hot oil and then bake it on in an oven. I don't know if a microwave will do the the job. andre, as an engineering expert, you should know that heating and work hardening don't mix. spokes derive their strength from the latter. oh, and you got the oil/heating thing the wrong way around too. |
#23
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How can I blacken stainless steel spokes?
On Wed, 13 May 2009 06:13:26 -0400, Nate Nagel wrote:
Tosspot wrote: Johan Bornman wrote: Nowadays with all the spoke options I am hard-pressed to keep, or indeed, find stock of all the permutations. How do they blacken spokes and can this be done in a workshop as and when needed? Can't you just heat them up and dunk them in motor oil. I seem to recall that from boyhood buggerings about. I'd think that would possibly change the heat treating properties of the steel, if any. (what you're describing is basically oil quenching...) I'd be tempted to try a home blueing kit intended for firearms - you won't get a perfectly black finish but close to it, and it won't look like paint either Tried it. You can get some permanent darkening, to a light smoke color, but the blackening rubs off with little more difficulty than soot. |
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How can I blacken stainless steel spokes?
On 5/12/2009 10:26 PM Carl Sundquist wrote:
Andre Jute wrote: On May 12, 8:18 pm, Johan Bornman wrote: Nowadays with all the spoke options I am hard-pressed to keep, or indeed, find stock of all the permutations. How do they blacken spokes and can this be done in a workshop as and when needed? You can have the spokes polished and black-chromed . However. chromeplating covers cracks and may even cause them, which is why stressed parts should not be chrome-plated. The same applies to ion-plating, which is good for a matte result. Or you can dip the spokes in hot oil and then bake it on in an oven. I don't know if a microwave will do the the job. Is there any sort of oxide treatment that might be suitable? Black oxide is the usual finish for blackening steel, but I don't know whether it works on stainless. For normal steel, black oxide does not prevent moisture from getting on the steel, so either wax or oil is applied as a rust preventative. As Peter Chisholm say, probably miles easier to buy black spokes. -- Mike "Rocket J Squirrel" Bend, Oregon |
#26
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How can I blacken stainless steel spokes?
jim beam wrote:
Bill Sornson wrote: Johan Bornman wrote: Nowadays with all the spoke options I am hard-pressed to keep, or indeed, find stock of all the permutations. How do they blacken spokes and can this be done in a workshop as and when needed? Wok with motor oil. Turn on high. destroys their strength. sigh. |
#27
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How can I blacken stainless steel spokes?
On Wed, 13 May 2009 07:21:25 -0500, AMuzi wrote:
wrote: Here's an early explanation of the enamel-nickel combination: "If your wheels are not yet built up, do not attempt the removal of hardened cups from hubs. The rims should be store enamelled before wheels are built, and the spokes carefully brush enamelled after completion; this insures good wearing cups. Many of our large firms run the risk of softening cases by enamelling complete for sake of appearance. If you must have perfection in appearance and finish, have your spokes nickel-plated right through if direct; and if tangent, plate 3 in. from headed end, and brush enamel up to where spokes cross each other." --"English Mechanic," 1894 "Store enamelled" possibly "stove enamelled" Dear Andrew, You're right--Google Books text just runs the blurry image through an optical character reader. Unfortunately, "store" made sense as "store-bought" as opposed to the advice to brush some stuff on yourself. Google reads it as "store" in that line, but it looks more like "stove" to me and it's clearly "stove" later in the same paragraph, past the quote: "If wheels are already built, and yon think it advisable to stove enamel complete, send with cups in, and on return from stoving note if temper has been drawn." The OCR often goofs things up. The replies to questions in "English Mechanic" used the same sort of pseudonyms popular nowadways in RBT, with replies signed "Fifty-Eight Inch" (a rather large size highwheeler, the equivalent of someone posting today as "55x11"). The author of the reply in question was "Derwent", but the OCR mangled it to "DeeweÜt"--he was one of the more prolific bicycle posters and something of a columnist for the "English Mechanic" magazines. Similarly, "S. Bottone" turns into "S. Bottonk" and then "S. Bottose" on that page, "An Amatkdr" was probably "An Amateur", and "Molkch" became "Moloch", which detracted from his Biblical pretensions. Cheers, Carl Fogel |
#28
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How can I blacken stainless steel spokes?
Johan Bornman wrote:
Nowadays with all the spoke options I am hard-pressed to keep, or indeed, find stock of all the permutations. How do they blacken spokes and can this be done in a workshop as and when needed? http://www.assda.asn.au/index.php?op...74&Itemi d=98 Surface Blackening Stainless steel surfaces can be readily blackened, the most common process is by immersion in a molten salt bath of sodium dichromate. This practice is widely used by the automotive industry to blacken stainless steel parts, such as windscreen wipers, and it is used by manufacturers of stainless steel solar collection panels and trivets for domestic gas stoves. The process applies a very thin smooth black oxide film to the surface of all stainless steel types. The film is normally dull black in colour, but it can be brightened by the application of oils or waxes. The film shows no tendency to age or lose colour in service; it is ductile, will not chip or peel, and it is resistant to heat-up to the normal scaling temperature of the stainless steel. A blackened stainless steel can be deformed moderately without harm and the film exhibits good resistance to abrasion. A black surface can also be produced by black chromium plating. Colouring A proprietary process used for colouring stainless steels entails immersing it in a hot chromic/sulphuric acid solution, followed by a cathodic hardening treatment in another acidic solution. The reaction of the base material with the hot acid produces a transparent film which in itself is basically colourless, but which shows colours through light interference. Colours produced in normal time sequence are bronze, blue, gold, red, purple and green, and within this range a wide variety of shades can be obtained. Black finish is also available. Appearance is also dependent on the nature of the starting surface; matt and satin surfaces produce matt colours, polished surfaces exhibit a high degree of metallic lustre. |
#29
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How can I blacken stainless steel spokes?
Mike Rocket J Squirrel wrote:
On 5/12/2009 10:26 PM Carl Sundquist wrote: Andre Jute wrote: On May 12, 8:18 pm, Johan Bornman wrote: Nowadays with all the spoke options I am hard-pressed to keep, or indeed, find stock of all the permutations. How do they blacken spokes and can this be done in a workshop as and when needed? You can have the spokes polished and black-chromed . However. chromeplating covers cracks and may even cause them, which is why stressed parts should not be chrome-plated. The same applies to ion-plating, which is good for a matte result. Or you can dip the spokes in hot oil and then bake it on in an oven. I don't know if a microwave will do the the job. Is there any sort of oxide treatment that might be suitable? Black oxide is the usual finish for blackening steel, but I don't know whether it works on stainless. For normal steel, black oxide does not prevent moisture from getting on the steel, so either wax or oil is applied as a rust preventative. As Peter Chisholm say, probably miles easier to buy black spokes. Why would rust be any more of a factor on an oxided stainless spoke than an uncoated stainless one? |
#30
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How can I blacken stainless steel spokes?
On May 13, 5:22*am, "P. Chisholm" wrote:
On May 12, 1:18*pm, Johan Bornman wrote: Nowadays with all the spoke options I am hard-pressed to keep, or indeed, find stock of all the permutations. How do they blacken spokes and can this be done in a workshop as and when needed? Are you in the US? A bike shop? If so I can give you the name of my spoke supplier, DT spokes, all lengths, black or silver, various gauges. It appears Wheelsmith spokes, or at least their db14s - 2.0/1.7/2.0 , come in both silver and black too: http://www.wheelsmith.com/spokes_db14.html Good Luck! |
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