Jay Sexton wrote:
>I just finished reading Sheldon Browns idea for adjusting bearing
>cones on Q.R. axles.
http://sheldonbrown.com/
> Very clever tool idea. Decades ago I was taught that the axles
>should be just a bit shorter than the dropout spacing so that the
>Q.R. lever DIDN'T contact the axle when closed,
That's definitely true. If the QR bumps into the axle, it can't
clamp properly on the dropout.
>thus not compressing the axle, thus not needing to compensate in
>your adjustment. Or does the axle still compress as a result of
>dropout pressure against the cones?
Exactly.
Bob Hovey wrote:
>I'm not sure I see how this works... My understanding is that hub compression
>results from the quick release pressure forcing the dropouts to counteract
>and overcome the push-pull action of the locknut and cone combo. If this is
>the case, shouldn't the force be applied to the outside faces of the locknuts
>(the knurled area in your photo) rather than the end of the axle?
>I can see
>that compressing the axle itself might squeeze the hub a tad, but I don't see
>how it would cause nearly as great an effect as the inward force of the
>dropouts on the locknuts.
If the force is the same, the compression of the section of axle betwixt the cones is also the same, whether the compression is applied to the locknuts or to the axle ends.
There is no slop in the cones themselves, because whatever slop there might be in the threads is taken up by the inward pressure of the locknuts against the cones.
Roy Drinkwater wrote:
> I was also puzzled by this, I don't think clamping the axle
>is as effective as clamping the locknuts. What I do when I adjust
>hubs is to clamp them in my 25+ year-old cheap Cyclepro wheelstand
>and tweak them until perfect.
That works too, but the beauty of my system is that it leaves the locknuts unobstructed and unconstrained, so that you can adjust both the cones and the locknuts while the axle is compressed, rather than having to keep loosening and tightening the skewer for each minor tweak. This is a major time saver.
I understand that it's not instantly intuitive how this works, that's why it's an invention!
Sheldon "One Of These Days I'll Have These Manufactured For Sale" Brown
Newtonville, Massachusetts
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