Richard - that's basically how your Bluthner laminated board was ribbed. Terry Farrell ----- Original Message ----- From: "Richard Brekne" <ricb at pianostemmer.no> To: "Michael Spreeman" <m_spreeman at hotmail.com>; "Pianotech List" <pianotech at ptg.org> Sent: Monday, August 04, 2008 2:56 PM Subject: Re: Crowning one rib at a time > Ah... so its not so much a matter of crowning the board itself rib by rib > as it is a matter of installing ribs one at a time due to space concerns > and the ability to reposition ribs on the fly... yes ?? I understand you > dry your panels down quite a bit before installing the ribs. How much > working time do you allow for in getting all ribs positioned and pressured > after the panel comes out of the box ? > > I'd love to see a picture of your basic setup. We've seen several variants > posted here through the past few years. The more the merrier... and the > more enlightening as it were. > > Thanks for the reply > RicB > > Michael Spreeman wrote: >> Hi Ric, >> No problem. Some factories have presses with a slotted perimeter to >> position the ribs on the panel. They can do this because they are >> producing numerous boards with the same rib scale and layout. The >> presses have a frame with pre-positioned arms that come down to the ribs >> as a unit and are inflated all at the same time. Our press consists of >> several indivual units that are positioned one at a time. This allows us >> to enact changes in the rib layout from piano to piano without having to >> reconfigure a large fixed press. We have limited space in our shop, so >> another advantage to individual frames and cauls is the ability to store >> the presses in a small area when not being used. Also, our press frames >> have removable cauls which allows us to remove one caul and replace it >> with another of a different radius if desired. >> >> / Michael Spreeman >> /http://www.spreemanpianoinnovations.com >> <http://www.spreemanpianoinnovations.com/> >> >> >> ------------------------------------------------------------------------ >> > Date: Mon, 4 Aug 2008 09:22:16 +0100 >> > From: ricb at pianostemmer.no >> > To: pianotech at ptg.org; m_spreeman at hotmail.com >> > Subject: Crowning one rib at a time -- Spreeman >> > >> > Was reading about the Ravencroft instrument and have been curious about >> > many things since first hearing about it. On the website it says >> > somewhere that the soundboard is crowned "one rib at a time". I wonder >> > if you could be so kind as to expound on that a bit. Exactly how do you >> > crown a board one rib at a time ? >> > >> > Thanks if you can find the time to explain >> > Cheers >> > RicB >> >> ------------------------------------------------------------------------ >> Get Windows Live and get whatever you need, wherever you are. Start here. >> <http://www.windowslive.com/default.html?ocid=TXT_TAGLM_WL_Home_082008> >
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