[pianotech] Yamaha Uprights

[Dean May]

I concur. Check the hammer spring cords. Much in archives on fixing them. 

 

Reduce damper spring tension. With action laying on its back, push on the
damper felts with your finger one at a time, use a wippen spring regulating
tool to bend the spring to reduce it. You might experiment with a few in
different sections to make sure you are leaving enough tension to keep the
dampers dampening. You can use a spring tension gage to try to keep it
uniform, but with a little practice you can just do it by feel. 

 

Check the regulation of the sustain pedal. With the pedal full on, the
dampers should be lifted enough so that no additional lifting happens when
the key is depressed. If the pedal does not produce this much lift, then as
the key nears the bottom of the stroke the spoon will contact the damper
lever and finish the job. This extra force at the bottom of the key stroke,
when the perception of the pianist is that things should be over, causes an
incomplete keystroke and the hammer to bobble. 

 

Otherwise, make sure regulation is good, particularly paying attention to
adequate after touch.

 

Dean

Dean W May                (812) 235-5272 voice and text 

PianoRebuilders.com    (888) DEAN-MAY        

Terre Haute IN 47802

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Dale Erwin
Sent: Saturday, December 01, 2012 6:37 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Yamaha Uprights

 

It is my opinion that the damper spring on all Asian uprights si to bloody
strong. There is no need and it does make the action heavy. 

 Check blow,key dip/travel/level,l.o. checking.

 If the spring loops are intact see regualtion. Otherwise, loops first, reg
after that.

Others said it better

Dale

Dale Erwin R.P.T.
Erwin's Piano Restoration Inc.
Mason & Hamlin/Steinway/U.S. pianos
www.Erwinspiano.com
Phone: 209-577-8397

 
  

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