[pianotech] wooden click at letoff?

[John Formsma]

Glue joint of the knuckle?

I've observed clicking noises coming from hard knuckles. Mostly on older
Young Chang and similar. Perhaps there's some hardened glue on that knuckle.

Or, maybe something weird with the drop screw.

That's all I can think of at the moment.

--
John Formsma, RPT
Blue Mountain, MS


On Tue, Nov 20, 2012 at 5:59 PM, Jim Ialeggio
<jim at grandpianosolutions.com>wrote:

> I'm chasing down a wooden sounding click on F1...its in a relatively
> recent Renner action, in good regulation, parts not appreciably worn.
>
> Confirmed it was coming from either the shank or knuckle as the jack
> pushes through letoff. Switched shanks with a neighbor, to confirm that the
> sound came from the shank assembly and not the jack/rep assembly or key.
> With the swapped shank, the sound went away.
>
> -Put the original shank back on F1, adjusted the jack proximal and
> distal...no change
> -Rep lever height ok
> -Pinning looks ok. 7 swings on a low bass hammer...a little looser than
> I'd like, but not terrible
> -Knuckle still has a good radius. Filed it lightly to see if there was a
> change, but as I expected, no change
>
> Was going to try to repin a bit tighter...but I my pinning tool was in the
> shop...oops
>
> Looked at the shank and hammer glue joint. No obvious issues.
>
> Any ideas???
>
>
> Jim Ialeggio
>
>
>
> --
> Jim Ialeggio
> jim at grandpianosolutions.com
> 978 425-9026
> Shirley Center, MA
>
>


-- 
John Formsma, RPT
Blue Mountain, MS
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