> The problem is not stem failure but rather permanent stem > attachment when the aluminum corrodes and often does so enough to > put a bulge in the steer tube.
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But can't this be easily eliminated by just undoing the quill bolt in your quill stem once a year with a 6mm Allen key and getting a stick of wood and smacking the top of the Allen key to loosen the cone or wedge in the fork steerer.
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I think what Brandt is saying is that over time when inserting the quill stem at the same depth in the steering column, a bulge could occur over time. I have heard of this happening, but never seen a column with a bulge. To me, one would have to really torque the steel wedge or conical cone to get the steel column to distort a bulge. A lot depends on the thickness of the column tubing.
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No. What Mr. Brandt is saying is:
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> The problem is not stem failure but rather permanent stem > attachment when the aluminum corrodes and often does so enough to > put a bulge in the steer tube.
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Mr. Brandt is talking about corrosion welding the quill stem inside the steerer. Eliminated by not allowing the quill to weld inside the steerer by just pulling it out once or twice a year and re-greasing it. The beginning weld is broken.
There is no welding. The contact is a high pressure interface with aluminum oxide expanding inside the steertube. Aluminum oxide cannot be welded to steel. That is why sawing off the stem just above the steertube, boring it out and breaking through one side with a Dremel tool releases the pressure fit and the remains pull out easily.
On May 7, 9:42 pm, [email hidden] wrote: > Tom Nakashima writes: > The problem is not stem failure but rather permanent stem attachment > when the aluminum corrodes and often does so enough to put a bulge in > the steer tube. But can't this be easily eliminated by just undoing the quill bolt in your quill stem once a year with a 6mm Allen key and getting a stick of wood and smacking the top of the Allen key to loosen the cone or wedge in the fork steerer.
I think what Brandt is saying is that over time when inserting the quill stem at the same depth in the steering column, a bulge could occur over time. I have heard of this happening, but never seen a column with a bulge. To me, one would have to really torque the steel wedge or conical cone to get the steel column to distort a bulge. A lot depends on the thickness of the column tubing. -tom
No. What Mr. Brandt is saying is:
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> The problem is not stem failure but rather permanent stem attachment > when the aluminum corrodes and often does so enough to put a bulge in > the steer tube.
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Mr. Brandt is talking about corrosion welding the quill stem inside the steerer. Eliminated by not allwoing the quill to weld inside the steerer by just pulling it out once or twice a year and regreasing it. The beginning weld is broken.
It's worse than that. Oxides are larger than metals. Corrosion there, between aluminum stem and steel steerer, where the water runs in, will bulge the column.
That effect is over and above boneheads who tighten a cone in the threaded area and other screwups. The effect to which Mr Brandt refers is inherent to the system with moisture from above, not a user error. (depending on how you define errors of omission and maintenance schedules) -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971
"A Muzi" <[email hidden]> wrote in message news:[email hidden]...
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It's worse than that. Oxides are larger than metals. Corrosion there, between aluminum stem and steel steerer, where the water runs in, will bulge the column.
That effect is over and above boneheads who tighten a cone in the threaded area and other screwups. The effect to which Mr Brandt refers is inherent to the system with moisture from above, not a user error. (depending on how you define errors of omission and maintenance schedules) -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971
Ok a corrosion/oxide problem between the aluminum stem and the steel steerer. Why not coat the inside of the steering tube with an epoxy type paint, which could be brushed on?
btw: I spoke with another frame builder about going with a threadless headset. He said I don't need to replace the steering column but instead to extend it. What he has done, is part the original steering column and make an ID 1.5" tube insert. He then cuts an extension piece of tubing to match the original column and brazes all three pieces together. And there you have a strong, straight threadless steering column. No need to repaint the fork. -tom
