This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment ----- Original Message -----=20 From: Erwinspiano@aol.com=20 To: pianotech@ptg.org=20 Sent: August 17, 2003 2:34 PM Subject: Laminated ribs Those of you who routinely use a laminated rib.=20 =20 My question is are these flat laminated pieces cut with a = crown in them or are you crowning the ribs in a curved caul. I know = this was discussed some time back but hey I don't recall it. If they're = laminated in a curve aren't they indeed more of a true arched rib (or = arched beam) than a solid piece of spruce rib stock with a machine cut = curve. In the rib glued in a curve the ribs the grain is indeed in an = arch even if it was made thick enough to cut the bottom of the rib flat = so as it had more material in the middle than on the ends. With a rib = laminated in an arch config. it's also possible to have a rib of uniform = dimension (if thats desireable). I don't know Phil F got me to thinking about that. Dale In our case the curve is bent in during the laminating process. I.e., = the cauls are made with a curve in them.=20 That curve can be most anything you want it to be, at least within = reason. It does not necessarily have to be a continuous radius. Ditto = the machined rib. Depending on the cutting template the curve can be = whatever you want it to be.=20 We press our laminated ribs with an equal thickness throughout. We then = machine them to our desired shape subsequent to laminating. The = soundboard side is just cleaned up--the caul radius is the rib = radius--and we shape the "bottom" side. Del ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/bb/20/c4/b2/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC