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> > > _______________________________________________ > > pianotech list info: https://www.moypiano.com/resources/#archives > > > >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives
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