Adding Cantilever posts to a fork
03-13-20, 02:42 PM
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Adding Cantilever posts to a fork
Over on the Google 650b group someone was asking about the above. I have in the back of my mind to do this on my Schwinn Super le Tour. But I have a replacement fork that is chrome. What is involved in the brazing process?
03-13-20, 03:03 PM
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The chrome should be removed from the HAZ to allow the filler to bond to the steel of the blades and to prevent any bad fumes from forming (something about a chromium containing gas that causes death or cancer). This removal might be elector/chemical "dechroming" or abrasive. Andy
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AndrewRStewart
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03-13-20, 03:38 PM
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Thanks Andy! Maybe I will rig up an exhaust fan or do it in front of my spray booth.
03-13-20, 05:25 PM
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Tom you need to remove the chrome otherwise the boss might break off because it is bonded to the chrome which can break off of the steel. In other words if you don't remove the chrome, you are relying on the strength of how well the chrome is connected to the steel and not necessarily on how good of a brazing job you did. And of course when you heat it up to braze you lessen that bond. Chrome as you know comes in different qualities of application. Some flake off easily while others with nickel and and copper underneath are much stronger.
03-13-20, 06:03 PM
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blahblahblah chrome moly
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I have put canti bosses on lightweight blades many times. The flex is perceptible, but not a problem IMHO. Add a brake booster plate in front of the brake if you're worried about it; the better ones really do work.
Mark B in Seattle
03-13-20, 06:11 PM
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No lawsuit. Promise!
