Bergman upright action problems

[Pierre Gevaert]

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En principe c'est possible  Pierrot
  ----- Original Message -----=20
  From: Piannaman@aol.com=20
  To: pianotech@ptg.org=20
  Sent: Wednesday, March 23, 2005 7:39 AM
  Subject: Re: Bergman upright action problems


  Bruce,

  The problem is that there is too much weight in the front of the keys =
for the weight of the action and spring tension combined to push the key =
back into place no matter how much lost motion I take out of it (I =
removed all I should have needed to and then some).  This is not a =
garden variety regulation problem, unfortunately. =20

  Dave Stahl

  In a message dated 3/22/05 9:13:14 PM Pacific Standard Time, =
justpianos@our.net.au writes:
    Hi,
    Missed the first part of this message, so this may be irrelavent, =
but assume=20
    this is an upright.
    Hence hammers should not be of the rail at all, and jacks should not =
have to=20
    force themselves under hammer butts as a gap should exist for this. =
Even in a=20
    grand the jack doesn't support the hammer roller, so regulation is =
at fault.
    Bruce Browning - The Piano Tuner




    Piannaman@aol.com said:

    > Some pianos should just never be made....
    > =20
    > I think these are made in the Chinese Young Chang plant.  They =
look =20
    > suspiciously like those little 107 jobbers that break jack springs =
from=20
    time to  time.
    > =20
    > First ("free") tuning presented a plethora of problems(Am I almost =
as =20
    > allitertive as Alan:-).  The hammers were a good half inch off the =
rail, =20
    keys were=20
    > tight, yada, yada, yada....
    > =20
    > The REAL problem was that the keyboard is so poorly weighted that =
there  is=20
    > so much downweight in the black keys at either end of the  =
keyboard that=20
    the=20
    > action weight and springs can't hoist them back into  position, =
with damper=20
    > pedal on or off.
    > =20
    > I didn't take readings, but I could feel huge weight differences =
from  one=20
    > key to the next.  After everything was regulated as well as  =
possible, keys=20
    > eased, keypins lubed, the jacks still could not force their  way =
back under=20
    the=20
    > butts, despite a healthy dose of teflon powder...
    > =20
    > I stretched the jack springs to increase tension, though if  I had =
time I'd=20
    > have replaced them with stronger ones.  This seemed to get  the =
thing to=20
    > function.
    > =20
    > Short of pulling leads out of the fronts of the keys, any other =
ideas =20
    > helping this action?
    > =20

    >=20


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