Pinning on new flanges

[Isaac OLEG]

Hi Ric,

I wonder if we know what is the function of the cloth under normal
play, and not "swing tests" or friction tests.
Even with the weight difference between bass/treble hammers, as only
one side of the bushing cloth compress, the picture involves more that
simply static friction issues.

Firmness of the part is more important than friction IMO, I feel it
while repinning (with usual methods), does not relate 100% with
friction generally.

Problem with those jobs is that one have to do them regularely to "get
a feel" for it. Even after 1 month it takes a few flanges to get back
tou the good evaluation.

Best Regards.

Isaac

-----Message d'origine-----
De : Richard Brekne [mailto:Richard.Brekne@grieg.uib.no]
Envoyé : lundi 30 août 2004 22:12
À : Pianotech
Objet : Re: Pinning on new flanges


David's Email wrote:

>
>
>     I used to do swing test but I found the results to be very
>     inconsistent.  When you factor in the different weights of
hammers
>     from top to bottom, what does the number of swings with some
>     arbitrarily picked hammer tell you?
>
It gives you direct information as to the firmness of the bushings
relative to the weight they must support.  And it tells you that the
friction for that weight is such that it provides a resistance that
yeilds a consistant acceleratation.  Which is why I prefer that over
Steinways  even friction priority method.


Cheers
RicB

>
>     Use a gram gauge and get an absolute number on your friction.
If
>     you tell me you get X swings I would need to know the weight of
>     the hammer and how far out on the shank it was located and as
you
>     have found out the angle it is relative to the flange.  Too many
>     variables for a number which doesn't really tell you anything to
>     begin with.
>
>     Just my 1 cent worth.
>
>
>     Andrew Remillard
>     2417 Maple Ave
>     Downers Grove, IL 60515
>     ANRPiano.com
>     630-852-5058
>