... is this because it is a top loaded force ? what about side loaded
forces like pedals on cranks ? hub shells outside of axle bearings ?
anyway appreciate this dicussion very much.
yours,
r clair
alexandria, va 22308
> At 08:28 PM 1/19/07 -0800, Scott L. Minneman wrote:
>
>>I spent a bunch of years in physics and engineering courses, but none if
>>that is helping me formulate a explanation for a properly fitted and
>>assembled headset coming loose in the way Dale describes.
>
> Well, when you jam 2 nuts together there is very little material to
> compress in the nuts, or material to stretch in the steerer. The most
> secure way to do it is to overtighten, which you don't really want to do,
> because it permanently deforms the threads. By having a washer in between,
> you are compressing the washer and stretching the steerer, thus are able
> to
> get more preload before causing permanent deformation. It's the same
> principle as stretching a bolt within its elastic limit when you torque
> it.
> Oh, sure, you can tighten a headset securely with no washer, but you run
> the risk of damaging the threads over time by doing this. There is a very
> fine line between too tight and too loose without a washer.
>
> John Betmanis
> Woodstock, Ontario
> Canada