[CAUT] Friction (was restrung D)

[Steve Fujan]

Ric,

It seems to me that the bridge pin should be hard enough to avoid
significant yielding at the contact point, to provide a reliable
termination, but I'm wondering if hardness is the issue though.

In my opinion, if the string "tears" the bridge pin, that is not good.
Conversely, if the bridge pin tears the string, that might be even worse.

Metals have different affinity for each other such that they tend to adhere
together more so than others.  Iron has the much affinity for itself.  Iron
has less affinity for titanium, so I'd say - yes, good idea.

I like Ron Overs' electroless nickel plated bridge pins even better though,
because they retain the stiffness of steel, and iron's affinity for nickel
is similar to titanium.

Best,
Steve


On 4/17/07, RicB <ricb at pianostemmer.no> wrote:
>
> Interesting Steve....
>
> So... getting back to harder then steel wire bridge pins.... and the
> standard ones.....  what say you to Freds comments about Sauters
> experiement with titanium bridge pin ?  Good idea / bad / or 50 cents of
> one and a half dozen of another ?
>
> Cheers
> RicB
>
>
>     Gentlemen,
>
>     I asked the "big tire" question way back in engineering school, and
> the
>     explanation was that when a tire slips on concrete it is not a matter
> of
>     exceeding a friction factor, it is actually tearing the
> material.  Since
>     larger tires have more surface contact area, there is more material
>     to tear
>     which takes higher forces and results in more traction.  This is not
> the
>     classical "friction" scenario.
>
>     There is another situation with big tires.  If you are on wet
>     concrete, then
>     big tires may afford less traction because the water cannot squeeze
>     out from
>     under the tire.  (hydroplaning) This is a lubricated interface,
>     unlike the
>     one above.
>
>     Best regards to all,
>     Steve Fujan
>     --
>
>
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