Backchecking Height and an incredible help

[Keith Roberts]

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I think this is right. From the recent discussion on how much the action =
parts flex, especially on a concert grand because of the heavier =
hammers, the backcheck could brush the hammer tail on a FFF blow but not =
be detected by using your hand to pressure the hammer and won't happen =
unless you try to hit a very hard blow. That would decrease the volume =
only on the hardest blows but not have an effect on soft or medium =
blows. Lowering the backcheck (we are not talking about checking height =
here we are talking about the height of the backcheck) would give the =
hammer a fraction of a second longer to get out of the way.
Keith Roberts
  ----- Original Message -----=20
  From: David Love=20
  To: Pianotech ; Richard Brekne=20
  Sent: Thursday, May 29, 2003 1:08 AM
  Subject: Re: Backchecking Height and an incredible help


  My guess is that if the hammer is checking so high that the tail rubs =
on the backcheck on the way up (just slightly) it will diminish hammer =
speed and the volume will be thus diminished making it seem like it is =
the close checking that is the cause.   Otherwise, I put this in Carl =
Sagan's "Demon Haunted World".

  David Love
  davidlovepianos@earthlink.net


    ----- Original Message -----=20
    From: Richard Brekne=20
    To: Pianotech
    Sent: 5/29/2003 12:34:58 AM=20
    Subject: Re: Backchecking Height and an incredible help


     =20
    BobDavis88@aol.com wrote:=20


      Hafta say I ain't buying this. The excursion of the string is so =
slight that I can't believe that an object 1/2" away could cause air to =
offer much impedance. I'm willing to bet if I held my thumb 1/2" from =
the string right above the strike point, no one could tell me when it =
was there and when it wasn't, blindfolded.
    Cant say I blame you. Does sound a bit fantastic.... to put it =
mildly. But next time you run into a grand that has obviously high =
checks you can try this out.=20
    Take any old note...maybe say A4 :), get a sense for its volume and =
compared with its neighbors. Run a few chromatics up and down. Then =
lower its back check to exactly 2 mm under the tail at drop and listen =
again.=20

    See what you think. I dunno, maybe you wont buy it then too. Maybe =
its like the proverbial green light at that last millisecond of sunset =
at sea..... But I do know what I heard.=20

      Sorry I don't have something more positive to offer as an =
explanation for optimal checking=3Dlouder tone. I'll be watching this =
space anxiously.=20
      Bob D

     RicB=20
    --=20
    Richard Brekne=20
    RPT, N.P.T.F.=20
    UiB, Bergen, Norway=20
    mailto:rbrekne@broadpark.no=20
    http://home.broadpark.no/~rbrekne/ricmain.html=20
    http://www.hf.uib.no/grieg/personer/cv_RB.html=20
     =20


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