This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment 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 An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/37/3d/df/da/attachment.htm ---------------------- multipart/alternative attachment--
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