fine grit hammer filing

[hubert liverman]

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James,
=20
It is a Dremel that is no longer made (early 1960). The speed is slow . =
I called Dremel for replacement parts (model# serial# etc) and I was on =
hold seemingly forever. They could not recognize it, had no parts,and =
could not positively identify it other than something that an old timer =
said was a Fish Scaler. At any rate, It was the one I learned the =
technique on and it still works. The rest of the thread has enlightened =
me, and I hope it helps you.

HubertLiverman
Tuner/tech
Opelika AL.
  ----- Original Message -----=20
  From: JAMES DALLY=20
  To: Pianotech=20
  Sent: Sunday, November 14, 2004 6:52 PM
  Subject: Re: fine grit hammer filing


  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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