fine grit hammer filing

[JAMES DALLY]

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Hi:  I am interested in the Flex Tool.  Could you tell me what tool, =
etc.  Many thanks,  Jim Dally
  ----- Original Message -----=20
  From: hubert liverman=20
  To: Pianotech=20
  Sent: Sunday, November 14, 2004 3:23 PM
  Subject: Re: fine grit hammer filing


  Are you using a flex shaft tool,and at what rpm? The one I use is a =
flex shaft some 40 years old and low speed.I do two passes, one from the =
'under' side of the hammer midway over the strike point,and one down. =
This leaves a little 'bead' at the point that can be  by 'light' paper =
sanding or the 'juice' of choice give good results when the action is =
replaced in the piano. I do not do this in the home, and include it in =
other action work deemed necessary... as they all do!=20

  Hubert Liverman
  Tuner/tech
  Opelika, AL
    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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