Checks cause hammer bounce ?

[Concert Piano Service]

On 14-mrt-2007, at 23:38, RicB wrote:

> Hi folks
>
> I ran into a symptom I haven't identified before.  I was bedding an  
> older Steinway D today, and made sure all three rails were good and  
> done in the right order... yet I was still getting too much hammer  
> bounce in the bass section on a hard blow.  The rest of the piano  
> was just fine... just the bass section had this problem.  Started  
> troubleshooting by first lifting the whippen up with my finger and  
> hitting the key hard to see if there was any bounce... nope..  Then  
> I lifted the hammer with a shank hook and hit the key hard... still  
> no bounce.... Then I noticed that when I lowered the shank enough  
> for the back check to make contact with the hammer tail... the  
> neighboring hammers started to bounce.  When I let the hammer go  
> into full check the full effect of neighboring bounce kicked in.
>
> I haven't managed to pounce out what the cure for this is.   
> Checking distance is 15 mm... action is reasonably well  
> regulated... drop is a bit deep but letoff, dip and aftertouch  
> amounts are all well within good tolerances.
>
> Any advice on the matter is of course very welcome.
>
> Cheers
> RicB



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