Keyframe Bedding

[erwinspiano at aol.com]

? Avery
? HEy dude.....Not to my knowledge
? Dale


-----Original Message-----
From: Avery Todd <ptuner1 at gmail.com>
To: Pianotech List <pianotech at ptg.org>
Sent: Mon, 7 Jul 2008 2:55 pm
Subject: Re: Keyframe Bedding



Dale, 

?

Isn't this similar to what Yamaha does? 

?

Avery Todd



On Mon, Jul 7, 2008 at 4:35 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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