[pianotech] clunking upright stickers

[Gerald Groot]

Or, the back checks hitting the stickers?  Or, the hammers bouncing off from
the hammer rail upon return?  Or, the wippen cushion felt?
Jer

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Joe Goss
Sent: Tuesday, March 08, 2011 9:44 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] clunking upright stickers

the clunk bay be coming from the balance and front  rail bushings
Joe Goss BSMusEd MMusEd RPT
imatunr at srvinet.com
www.mothergoosetools.com
----- Original Message ----- 
From: "David Nereson" <da88ve at gmail.com>
To: <pianotech at ptg.org>
Sent: Tuesday, March 08, 2011 1:40 AM
Subject: [pianotech] clunking upright stickers


>    Thanks for all the replies on mating grand hammers to 
> strings.
>    Now I have a piano teacher's old upright whose 
> stickers/wippens clunk pretty loudly when returning.  If I hold 
> down the back of the keys in question, and lift the wippen and 
> let it drop, I hear the clunk.  Depressing and releasing the key 
> also clunks, sometimes just as loudly, sometimes not.  I tried 
> replacing the sticker cloth with brand new medium thick action 
> cloth.  Still clunks.  Tried replacing the sticker cloth with 
> hammer skiving felt about 1/8" thick and that was slightly 
> quieter, but not much.  Tried re-pinning the wippen flange. 
> Still clunks.  Grabbed both the sticker and wippen 
> simultaneously, trying to move them apart and away from each 
> other, testing the sticker-to-wippen pinning for any play, and 
> didn't feel any.  The action has been regulated (no lost 
> motion).  And it's not clicks from missing butt felts.
>    Now, there's some other minor clunking from balance holes 
> that are slightly "pulley," and from key bushings that could 
> stand to be replaced, but again, when holding the key still and 
> raising & releasing the wippen, I still get the noise.
>    I told her there's always a little noise in the action, and 
> it can't be eliminated 100%, but these "clunks" seem excessively 
> noisy and are noticeable even with all the front case parts in 
> place.
>    --David Nereson
> 
>