Keyframe Bedding

[Jude Reveley/Absolute Piano]

I've experienced the tonal improvement but I've also noticed an occasional increase in the volume of keyslap on the backrails and sometimes extra knocking in the treble hammers. To my knowledge, the backrail was well secured by the dags and it's definitely not keyframe knocking. 

Jude Reveley, RPT
Absolute Piano Restoration, LLC
Lowell, Massachusetts
(978) 323-4545


----- Original Message ----- 
From: "andre oorebeek" <oorebeek at planet.nl>
To: "Pianotech List" <pianotech at ptg.org>
Sent: Monday, July 07, 2008 5:41 PM
Subject: Re: Keyframe Bedding


> And, turning the bolts tighter also increases the tension in the tone.
> The bolts are in a way like tuning forks.
> If you press down a tuning fork hard on a wooden surface, the tone it  
> generates will intensify.
> That way it is possible to 'voice' by adjusting the bolts.
> 
> friendly greetings
> from
> André Oorebeek
> 
> Antoni van Leeuwenhoekweg 15
> 1401 VW Bussum
> the Netherlands
> 
> tel :   0031 - 35 6975840
> gsm : 0031 - 652388008
> 
> concertpianoservice at planet.nl
> www.concertpianoservice.nl
> 
> "where music is,
> no harm can be"
> 
> 
> On Jul 7, 2008, at 11:35 PM, erwinspiano at aol.com wrote:
> 
>>
>>
>>
>> -----Original Message-----
>> From: erwinspiano at aol.com
>> To: ilvey at sbcglobal.net
>> Sent: Mon, 7 Jul 2008 2:33 pm
>> Subject: Re: Keyframe Bedding
>>
>> The key frames in modern grands all have a somewhat arched/pinched  
>> key frame arrangement  front to back & end to end. Adjusting the  
>> bedding bolts to a neutral position to start with & then turning the  
>> bolts tighter against the key bed is where the stressing comes  
>> from.  You can measure the subsequent rise at the front of the keys  
>> as the bolts are being turned as  per Jon Pages suggestion.  The  
>> back of the frame is held down by the dags & the ends by the key  
>> blocks
>>   Actually this is also a bit of a buffer or safety factor for  
>> climate changes. This way the bolts will hopefully stay in contact  
>> with the bed in each season & not be so prone to change with  
>> humidity & temp.
>>   Dale
>>
> 
> 
> 
> 
> 
> 
> 
> 
>
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