<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>Re: Keyframe Bedding</title> </head> <body> <div align="left">I remember LaRoy mentioning this in one of the 39 steps classes.   I don't think it was stated as general practice?   <br/><br/>David Ilvedson, RPT<br/>Pacifica, CA 94044<br/><br/> <div style="padding-right: 5px; padding-left: 5px; padding-bottom: 5px; border-left: #000000 3px solid; padding-top: 5px"> <hr/>Original message<br/>From: "Avery Todd" <ptuner1@gmail.com> </ptuner1@gmail.com><br/>To: "Pianotech List" <pianotech@ptg.org> </pianotech@ptg.org><br/>Received: 7/7/2008 2:55:05 PM<br/>Subject: Re: Keyframe Bedding<br/><br/> <div align="left">Dale, </div> <div> </div> <div>Isn't this similar to what Yamaha does? </div> <div> </div> <div>Avery Todd<br/><br/></div> <div class="gmail_quote">On Mon, Jul 7, 2008 at 4:35 PM, <<a href="mailto:erwinspiano@aol.com">erwinspiano@aol.com</a>> wrote:<br/> <blockquote class="gmail_quote" style="padding-left: 1ex; margin: 0px 0px 0px 0.8ex; border-left: #ccc 1px solid"><br/><br/><br/>-----Original Message-----<br/>From: <a href="mailto:erwinspiano@aol.com" target="_blank">erwinspiano@aol.com</a><br/>To: <a href="mailto:ilvey@sbcglobal.net" target="_blank">ilvey@sbcglobal.net</a><br/>Sent: Mon, 7 Jul 2008 2:33 pm<br/>Subject: Re: Keyframe Bedding<br/><br/> <div>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<br/>  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.<br/>  Dale<br/></div> </blockquote> </div> </div> </div> </body> </html>