Yamaha hammers

[Avery Todd]

David,

What are "quarried" hammers? Just curious.

Avery

At 07:01 AM 11/6/03 -0800, you wrote:
>I've scheduled a major voicing of a Yamaha C7 with quarried hammers for
>next week and finally broke down a bought myself a cordless Dremel
>(actually Craftsman $29.99) for the job.  You need to buy a 1/32" collett
>to hold the needle.  An extra battery doesn't hurt either.
>
>David Love
>davidlovepianos@earthlink.net
>
>
> > [Original Message]
> > From: <A440A@aol.com>
> > To: <pianotech@ptg.org>
> > Date: 11/6/2003 6:02:29 AM
> > Subject: Re: Yamaha hammers
> >
> > I wrote about needling hard hammers:
> > >   . . . with a single #6 needle that is almost long enough to reach the
> > core wood.
> >
> > David asks:
> > > What kind of needle do you use and how do you keep them from breaking?
> > Every time I try a length longer than about 5/16", they break on me.
> >
> >    I have found that you can't get the needle in, all the way, at first.
>So,
> >  I begin softening the shoulder with shallower jabs, gradually getting
>full
> > penetration after maybe 15 or so progressively deeper needles.  I suppose
>I
> > voice by tactile feel, first.  By now, I know what a nicely voiced hammer
>feels
> > like on the shoulders, and prep them accordingly.  (note, this is NOT a
> > technique for Steinway hammers that are loaded with lacquer).
> >
> > >   The hammers are so hard that if you begin at the upper shoulder, the
> > > tension in them will tear them apart after a while.
> > > Regards,
> > > Ed Foote RPT
> >
> >
> > >>Is that indeed what's happening in a hammer with lots of tension --
>like
> > bending a rope sharply, then hacking at the top of the bend with a knife,
> > gradually cutting the fibers and making it pull apart?  >>
> >
> > That seems to be an appropriate analogy.  With sufficiently soft
>shoulders,
> > graduated to real hardness under the strike point, the hammers hold
>together
> > quite well and respond very sensitively to needles going in near the
>strike
> > point.
> > Regards,
> > Ed Foote RPT
> > http://www.uk-piano.org/edfoote/index.html
> > www.uk-piano.org/edfoote/well_tempered_piano.html
> >  <A
>HREF="http://artists.mp3s.com/artists/399/six_degrees_of_tonality.html">
> > MP3.com: Six Degrees of Tonality</A>
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>
>
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