---------------------- multipart/alternative attachment Wow, beautiful board! Giovanni Voltaggio Austin, Texas > From: Overs Pianos <sec@overspianos.com.au> > Date: October 15, 2005 7:41:14 PM CDT > To: Pianotech <pianotech@ptg.org> > Subject: Sound board trenching and stuff > Reply-To: Pianotech <pianotech@ptg.org> > > > Hi all, > > A couple of weeks ago (can't remember the name of the thread or to =20 > which list it was posted), Dean May floated the idea of trenching =20 > the sound board at the rear, adjacent to A1, as an alternative =20 > means to cutting a full soundboard float. > > As someone responded to Dean's suggestion, we've been trenching =20 > boards for many years now (since about the mid 90's). Seiler have =20 > been trenching the entire sound board perimeter for even longer. We =20= > tried this also, but after a serious of experiments over several =20 > years the idea has evolved to that which you see below. This image =20 > is of a Kawai KG6 that we're rebuilding at the moment. The trench =20 > depth is 5 mm, half that of the panel thickness. We fitted rib =20 > extensions and re-crown the board, fitted an Overs action and are =20 > in the process of a full refinish. We've kept the original bridges, =20= > even though the long bridge is a little lower than my preference. =20 > We've re-cut the notching and refinished the board. The plugged =20 > perimeter bolt hole (to the left of image) is a consequence of the =20 > Oak rim in these early KG series pianos. Oak is a good wood for =20 > rims but it is prone to corroding the fittings. Its not usual to =20 > twist off two or three perimeter bolts when removing a KG plate (we =20= > replace the original bolts with heavier gauge zinc plated coach =20 > bolts - with dome nuts fitted for looks - to avoid getting cursed-=20 > in-the-box sometime mid century). Normally, if replacing a board, =20 > we would use the Baldwin plate mounting system. But when re-=20 > crowning an existing board we leave the original plate mounting =20 > dowels in place. We typically will need to pack the stringing =20 > pillows by up to 5 mm at the mid-board area to establish a workable =20= > down bearing with a re-crowned panel. > > I've taken a series of images of the re-crowning process for this =20 > rebuild. I'm putting them together for a class I'm giving in =20 > Auckland on the 29th. The New Zealand branch of the APTTA is =20 > holding a mini-convention in Auckland on Oct 29 and 30. Anyone =20 > feeling like a tax deductible weekend in New Zealand? > > Ron O. > =EF=BF=BC-- > OVERS PIANOS - SYDNEY > Grand Piano Manufacturers > _______________________ > > Web http://overspianos.com.au > mailto:ron@overspianos.com.au > _______________________ > ---------------------- multipart/alternative attachment --Apple-Mail-2-792912398 An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/6d/71/24/c2/attachment.htm --Apple-Mail-2-792912398 A non-text attachment was scrubbed... Name: a06110427bf774601661b Type: image/jpeg Size: 81466 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/1d/7d/c5/6e/a06110427bf774601661b.jpe --Apple-Mail-2-792912398-- ---------------------- multipart/alternative attachment--
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