[pianotech] knocking noise in Kawai KG-2S

[Paul T Williams]

Or loose key leads...?  Iike the keybedding thought most so far...

Paul




From:
Mike Spalding <mike.spalding1 at frontier.com>
To:
Paul Mulik <tubist at swbell.net>, pianotech at ptg.org
Date:
12/13/2010 10:33 AM
Subject:
Re: [pianotech] knocking noise in Kawai KG-2S



Paul,

I agree with everyone who has suggested frontrail bedding as the most 
likely cause.  However, 2 other knocks that have fooled me in the past: 1: 
 Uneven key spacing combined with worn front rail bushings and/or loose 
front rail pins combined with pianist technique striking the furthest keys 
with a motion as much sideways as downward, causing keys to knock on 
neighboring keys.  2:  Loose leads in damper underlevers.

Mike

On 12/12/2010 10:09 PM, Paul Mulik wrote: 
Hello list,
 
A couple of days ago I did a couple of tunings for a church, and just as I 
was about to leave they asked me to have a quick look at a third piano, a 
Kawai KG-2S grand.  I literally had one minute to look at it, as the choir 
was entering the room to practice.  I didn't have time to pull the action.
 
Anyway, the lowest 5 or 6 bass notes had, in addition to their normal 
sound, a knock, like wood knocking against wood.  Is this likely to be due 
to a gap between the key frame and the keybed, or should I look for 
something else?  I'm going back on Monday to have a better look. 
 
Thanks,
Paul Mulik, Joplin MO


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