This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Ron O wrote:=20 > I pulled one original board which=20 > clearly had lots of crown when it was installed, but the inner was=20 > made flat. The glue joint was good around the outer edge but the=20 > inner edge was only just making contact or just off the rim. Sound to me like somebody needs to learn how to either spread glue, or = more likely clamp a glue joint thoroughly! I've started to use a method that Ron N shared with me. I cut strips of = scrap plywood the shape and width of the inner = rim/belly-rail/fish/cut-offs/etc., place them on top of the soundboard = and use those pieces as clamping blocks. I think use of such blocks, = along with numerous clamps, insures a pretty darn good glue joint - oh, = and good glue surfaces and good glue and the proper amount of glue and = anything else I have neglected to mention. Terry Farrell ----- Original Message -----=20 > >Is a flat belly rail a good idea then? >> >>Thanks >>RicB >=20 > It is around here. We're using a flat belly rail in our 225 pianos.=20 > By this I mean that there is no curvature across the span of the=20 > belly rail. The central area of our boards have nearly 10 mm of crown=20 > unstrung. When strung, a string line placed underneath the board will=20 > almost clear the sound board buttons. If the belly rail was crowned=20 > as well it would make for serious problems achieving a workable=20 > relationship between bridge height, bearing block height and the=20 > correct down bearing angle setting. >=20 > We do angle the belly rail and inner rim gluing face to the crown of=20 > the board. As Terry suggests, it probably isn't greatly important.=20 > But I like to do it just to know that the glue joint is good all the=20 > way across the interface. I'll pulled one original board which=20 > clearly had lots of crown when it was installed, but the inner was=20 > made flat. The glue joint was good around the outer edge but the=20 > inner edge was only just making contact or just off the rim. I can't=20 > say I'd be comfortable about such a gluing arrangement. It could very=20 > easily allow noise at the perimeter of the board in some instances. >=20 > Ron O. > --=20 > OVERS PIANOS - SYDNEY > Grand Piano Manufacturers ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/fc/c5/0f/0d/attachment.htm ---------------------- multipart/alternative attachment--
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