Bicycle Mechanics - gnurling Ti?
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01-29-06, 06:13 PM
i have a Ti fork. my king crown race fits a little loose on it. barnetts also recommends gnurling and/or using loctite 680 retaining compound, but does not address whether gnurling or the loctite is compatible with Ti! i dont want to ruin the tool attempting to gnurl it.
any Ti experts out there?
01-29-06, 06:24 PM
I'm no expert, but used to collect bike mag articles that dealt with alternative materials. Titanium's considered the "hot-rod" of metals. I recall a clip that stated the bits they use to machine steel tubes would do 30 steel tubes but only three titanium tubes before needing resharpening. That figure sticks in my mind - I take it that titanium is harder (though lighter) than steel. I hope that helps.
01-29-06, 07:57 PM
The reason drill-bits and cutting tools wear out faster on ti is because its thermal conductivity is only 1/2 that of steel. So the surface temperature at the contact area heats up a lot more than steel. This heat wears out cutting tools faster.
Rockwell (surface) hardness of ti is about 1/10th to 1/5th that of steel. Modulus (stiffness) of ti is also about half that of steel. However, strength (yield & ultimate) can be twice that of steel, so you've got a soft springy material. Knurling tools will work just fine on ti, you'll need to run it through twice because the material springs back and doesn't take a set as easily as steel.
01-29-06, 09:23 PM
Are you certain the fork is Ti? That a very unusual material for forks. They are available but very rare.
BTW, Loctite will work fine on any metal; steel, Al or Ti.
01-29-06, 10:30 PM
thanks danno, that was the info i was looking for.
im gonna contact the fork manufactorer before i try any monkey business, of course. hopefully they'll warranty it!
01-30-06, 09:17 AM
Light indentations made with a cold chisel work pretty well for knurling. Not pretty but effective.
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