I remember LaRoy mentioning this in one of the 39 steps classes. I don't think it was stated as general practice? David Ilvedson, RPT Pacifica, CA 94044 Original message From: "Avery Todd" To: "Pianotech List" Received: 7/7/2008 2:55:05 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080707/9a17c7fe/attachment.html
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