Importance of the staple

[Isaac OLEG]

Hello,

On the sheet for ordering hammers at Renner's, choice is given between
"passing thru staples", simple staples and no staple.

The way the staple acts when the base is needled is that it retain the
external layers of felt.
If you look closely at the glue joint at the base of the hammer, you
will see that the staple does not pass thru all the layers, but mostly
the external ones.

Then when you rob the tension remaining in the underside it goes
higher, reinforcing the hammer from the inside, and the external part
stays more in place because of the staple.
If there where none, all the felt would move towards the higher
regions, and loose resilience.

May be that is why it is written , for example in Reblitz, "Never
needle in this area".

Second , the few US pianos I've seen did not use the power from below
in their voicing process, so all is happening in the higher regions
(Baldwin, S&S,). Then the tone is more straight, and less lively , the
power is given immediately since the attack, so less colorations of
tone are possible.

The soundboards too where more fast in their reaction, with a less
long time for amortissment (my impression).

Anyway, I don't believe in marketing at this point.

Regards.

Isaac OLEG




> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Ron Nossaman
> Envoye : dimanche 22 septembre 2002 17:32
> A : Phil Bondi; Pianotech
> Objet : Re: Importance of the staple
>
>
> I get the impression here that a staple is a staple is a
> staple, but they
> aren't all the same. I just cut up a few old hammers left
> over from sets
> past, and found a few significant variations on the theme.
> One is a wire
> loop, inserted from the bottom, clear through felt and
> molding, and twisted
> together on the top. One is a long T staple inserted from
> the bottom,
> through felt and molding, and spread apart at the top like
> a cotter pin
> installation. A couple more are staples, driven or inserted
> through the
> felt and into, but not through the molding. The last one
> has staples that
> don't even reach the molding, and in fact don't even reach
> the underfelt.
>
> It seems pretty clear to me that these different staples
> will have somewhat
> different properties as reinforcement fasteners of a felt
> to wood glue
> joint, and that not differentiating between them makes most of the
> discussion somewhat less than informative. So clarify
> please, and qualify
> observations and speculation with a more accurate
> description of what
> you're talking about. Those that did, please disregard.
> Ron N
>
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