[pianotech] Hammer rest felt

[Rob McCall]

Thanks Keith,

Looking through the entire piano (A0 to C8), all the hammer shanks  
appear to be resting on the felts, but this is the only section where  
the felts were being displaced. The blow distance I measured at 50mm,  
book says 47.5mm. Even if they were set at 47.5 I believe they'd still  
be in contact across the entire action.

Regards,

Rob McCall

On Jun 13, 2009, at 09:25 , Keith McGavern wrote:

>
> On Jun 13, 2009, at 2:23 AM, Rob McCall wrote:
>
>> It appears as if the hammer rest felt has been displaced to the  
>> sides by the hammer shank.  This occurs only in the bass section  
>> and it occurs off and on throughout the range from A0 to A#2.  The  
>> tenor section to the high treble looks fine.
>>
>> Any input, ideas, or things I should look for as to the cause of  
>> this would be greatly appreciated.  I should be able to get back to  
>> this piano in about 2-3 weeks due to their scheduling.
>
> Rob,
>
> The first impression I had from your pic was the hammer shanks are  
> actually in contact with those felts indicating the hammer distance  
> to strings is too great. From my understanding of grand regulation,  
> the shanks should be suspended above those felts somewhat while  
> maintaining a ballpark hammer distance to strings parameter. If that  
> parameter cannot be achieved without the shanks resting on the  
> felts, I would suspect a trimming of the felts would be in order.
>
> Keith
>