fine grit hammer filing

[JAMES DALLY]

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Terry: At what RPM?  thanks
  ----- Original Message -----=20
  From: Farrell=20
  To: Pianotech=20
  Sent: Sunday, November 14, 2004 11:20 AM
  Subject: Re: fine grit hammer filing


  Keep in mind that the only time I do this is when trying to salvage an =
old ready-for-the-grave trashy upright. Do I voice afterwards? No. Does =
the piano sound good when I am done? No. Does it sound better than it =
was? Yes. Can I do a crude regulation now? Yes. I only remove felt down =
to the bottom of the grooves, but yes, this often leave the hammers will =
very little felt - but again, trashy pianos only here.=20

  After a few attempts, I have worked out a one-swoosh technique for =
using the Dremel hammer file tool. I start at 8 o'clock and swoosh right =
around the whole hammer to a good 4 o'clock (basically from staple to =
staple). Once you get the hang of it you get a real nice smooth hammer =
surface, good shape, and you go so fast that there is no burning or =
anything even close to that.

  Terry Farrell
    ----- Original Message -----=20
    From: Quentin Codevelle=20
    To: pianotech=20
    Sent: Sunday, November 14, 2004 9:41 AM
    Subject: fine grit hammer filing


    Hi Terry,

    I tried the router-shaper thing a few times on extremely grooved =
hammers.
    I don't like this solution very much because I had the impression =
the machine is heating the felt very much, resulting an awful tone,real =
harsh with a lot of voicing work to do after the shaping machine =
operation.

    Of course it is fast, but the other problem is you have to get the =
habit of using it, because I saw some hammers shaped with this shaper by =
someone who never did this kind of work before, and it was a total =
disaster.
    The hammer set was totally ruined, with not enough felt left, and an =
awful hammer shape.

    What is your experience with it?=20

    Quentin
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