Blubber Pluzzler

[Dave Bunch]

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Close enough, John. The first four notes in the tenor are wedge dampers. =
The wedges are so long and thin, that when fully seated felt is mushed =
out around the strings, so that the dampers actually grab on to the =
strings as they try to lift. On a light stroke, they either don't lift =
at all, giving the illusion of hammer blocking and double striking =
because the jack is short of escapement, or the dampers do lift but only =
after just enough of a delay that the hammer has time to bounce off the =
the jack once.

Your prize is a virtual coupon for a Story and Clark Storytone =
soundboard crack repair kit.

Dave Bunch
  ----- Original Message -----=20
  From: John Delmore=20
  To: 'Pianotech'=20
  Sent: Friday, November 04, 2005 1:50 PM
  Subject: RE: Blubber Pluzzler


  Brand new piano?  Dampers so badly regulated that they catch the bass =
strings, preventing full travel of the wippen?  When you smack it hard, =
the string moves?  Regulate the damper spoon properly, then adjust the =
damper head appropriately?

  =20


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  From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On =
Behalf Of Dave Bunch
  Sent: Friday, November 04, 2005 1:17 PM
  To: tune4u@earthlink.net; Pianotech
  Subject: Re: Blubber Pluzzler

  =20

  This is an odd one....A clue- The notes involved are the first 4 in =
the tenor section and no others.

  =20

  Dave Bunch

    ----- Original Message -----=20

    From: Alan Barnard=20

    To: Pianotech=20

    Sent: Friday, November 04, 2005 11:48 AM

    Subject: Re: Blubber Pluzzler

    =20

    Damper heads misaligned, hammers brushing or hitting them?

    =20

    Alan Barnard

    Salem, Missouri

    =20

    =20

      ----- Original Message -----=20

      From: Dave Bunch=20

      To: Pianotech

      Sent: 11/04/2005 11:17:37 AM=20

      Subject: Re: Blubber Pluzzler

      =20

      No, but the dampers are involved in the problem.

      =20

      Dave Bunch

        ----- Original Message -----=20

        From: Mark Ultsch=20

        To: Pianotech=20

        Sent: Thursday, November 03, 2005 11:27 PM

        Subject: Re: Blubber Pluzzler

        =20

        Damper lever spring way too tight causing the wippen to want to =
rotate and keep the jack tucked under the hammer butt??

        =20

        If I'm way off base, feel free to enlighten me.

        =20

        I actually like to have customers watch my diagnostic work.  It =
gives me an excuse to use one of my better diagnostic methods: talking =
to myself.

        =20

        Mark Ultsch

        Madison

          ----- Original Message -----=20

          From: Dave Bunch=20

          To: pianotech@ptg.org=20

          Sent: Thursday, November 03, 2005 6:54 PM

          Subject: Blubber Pluzzler

          =20

          Hello-

          =20

          Blubbering (double striking) hammers in a vertical are not all =
that uncommon, but today I found a cause that I don't remember seeing =
before.

          =20

          It was a new Baldwin Hamilton studio sized piano. The customer =
was complaining that several notes in the low tenor area were not =
sustaining. When I got there I found that these few notes were double =
striking and sounding like they were blocking when played lightly. =
Actually anything up to a light/moderate keystroke.

          =20

          I checked the position of the let off rail and regulation in =
general. So far things looked fine. Moving the key down slowly produced =
let off at about 1/8" and there was sufficient key dip for plenty of =
after touch. Back checking was fine. I went to the worst one and to =
satisfy my curiosity, cranked the button down to where let off was about =
1/2". This changed nothing. The hammer was still bouncing off the top of =
the jack. Only on a very firm stroke would everything cycle through as =
it should. Most of the piano was just fine. It was these few notes.

          =20

          Well, it only took about five minutes to figure it out, but it =
was a long five minutes with the customer watching. Anyone want to guess =
on this one?

          =20

          Dave Bunch


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11/3/2005


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  No virus found in this incoming message.
  Checked by AVG Free Edition.
  Version: 7.1.362 / Virus Database: 267.12.7/160 - Release Date: =
11/3/2005

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