[pianotech] Jack and Damper Spring Tension Targets

[Gene Nelson]

sorry about that.
  ----- Original Message ----- 
  From: Barbara Richmond 
  To: pianotech at ptg.org 
  Sent: Thursday, July 30, 2009 8:44 AM
  Subject: Re: [pianotech] Jack and Damper Spring Tension Targets


  I believe that we're talking about upright actions here...

  Barbara Richmond, RPT
  near Peoria, Illinois

  ----- Original Message -----
  From: "Gene Nelson" <nelsong at intune88.com>
  To: pianotech at ptg.org
  Sent: Thursday, July 30, 2009 10:29:08 AM GMT -06:00 US/Canada Central
  Subject: Re: [pianotech] Jack and Damper Spring Tension Targets


  I was shown one method but it is mainly for new, replacement back actions or if you have it out on the bench.
  As I only install springs to the top wound bichord this is what I do.
  Hold the damper tray upside down. Spring tension should hold the lowest lever for note A-0 fast against the tray felt and the top bichord should be suspended about 30mm+/- from it. All the others should be adjusted so that they taper evenly between the two in a nice straight line.
  Works fine for me and when measured with the expensive gram gauge it turns out to be close enough to the Renner spec.
  Gene
    ----- Original Message ----- 
    From: Gregor _ 
    To: pianotech at ptg.org 
    Sent: Thursday, July 30, 2009 2:33 AM
    Subject: Re: [pianotech] Jack and Damper Spring Tension Targets


    The damper spring tension should decrease from bass to treble. Sometimes I see in old pianos a pencil line on the damper levers which goes diagonal over all the levers of one area (bass, tenor, treble). I was told that this line was used to measure the spring tension, but I was not told how exactly that procedure works. Does anybody know?

    Gregor

    ------------------------------------------
    piano technician - tuner - dealer
    Münster, Germany
    www.weldert.de




    > From: fg at floydgadd.com
    > To: pianotech at ptg.org
    > Date: Wed, 29 Jul 2009 06:03:25 -0500
    > Subject: Re: [pianotech] Jack and Damper Spring Tension Targets
    > 
    > Hi Gregor,
    > 
    > Ted's CAUT post of Oct 15/07 is quoted below. He was responding to a post
    > from David Ilvedson, as noted.
    > 
    > What I'm exploring here is new ground for me, and I'm trying to establish
    > points of reference.
    > 
    > Thanks for your interest!
    > 
    > Floyd Gadd

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090730/a07ea368/attachment.htm>