This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hello Dave, I have no argument with you or the Bösendorfer people. There is a simple misunderstanding as to where the wedges go. The reps are talking about the top edge of the rim. The wedges go into the TOP of the saw kerfs and veneer goes over that. See photo. The sides are laminated with K 3 board, as one can vaguely make out in the picture. Best regards, Jurgen Goering Dave Mckibben wrote: I was just at a PTG meeting with Bosendorfer people and they did state what Paul C. said below. The rim is kerf cut so it can be bent to form to the inner rim, then filled and glued with wedges. The wedges are sanded and a veneer is laid over the surface. Dave ----- Original Message ----- From: Piano Forte Supply <mailto:pianoforte@pianofortesupply.com> To: pianotech@ptg.org <mailto:pianotech@ptg.org> Sent: 1/24/2005 7:04:34 PM Subject: RE: circle of sound The outer rims I saw at the Bösendorfer factory surprised (scared!) me. There was the edge grain spruce, as has been described, but it was only about 15 mm (5/8") thick. On the inside and outside, a sheet of K-3 board was laminated to it! This is a hard paper press board (think of a peg board). Then, a sheet of formica is glued on to the outside of that for pianos that will be black (sometimes called ebony - not to be confused with that exotic, precious wood). This gives a stable base for the polyester. I understand most companies use the formica trick, but perhaps the K-3 board is the secret ingredient to the Bösendorfer sound ???! Jurgen Goering www.pianofortesupply.com > >You are both correct. >James has described the inner rim, and Paul has described the outer rim. As >of a few weeks ago, that is still how they are made! > >Jerry Cohen, RPT >NJ Chapter > > > >>It is my understanding that the Bosey rim is not laminated spruce but solid >>spruce edge glued and end glued to gether and then the shape is carved out >>of that. That would keep the vibration back to the SB sine there are no >>plies to soak it up> >>Jim >>James Grebe >> >> >>Bosendorfer released a tech video in the late 1980"s(?), of their >>manufacturing plant. It showed the rim being kerf cut so it would bend >>around the inner rim. The inside and outside of the rim were veneered. >> >> >The > > >>kerf cuts were filled with wedges and the edge(s) veneered to match. I can >>only assume they still do this today. >> >>Paul C >> >> ---------------------- multipart/alternative attachment --------------020307040307060105060304 An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/1a/7d/1f/55/attachment.htm --------------020307040307060105060304 A non-text attachment was scrubbed... Name: not available Type: image/jpeg Size: 7567 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/01/98/02/c6/attachment.jpe --------------020307040307060105060304-- ---------------------- multipart/alternative attachment--
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