What would be the argument for thinning on a compression and not on a RC&S board, floats aside? On RC&S boards where there is no float I believe that Del advises thinning in the tail (which is what I have routinely done), though I will let him comment for himself. With a float, btw, the tail is actually made thicker with a lamination which also keeps the otherwise unlaminated panel from splitting. Since the flexibility of the panel is reduced at the edges by virtue of the proximity to the inner rim I can see the argument for some thinning near the edges though perhaps not a gradual taper all the way to the center of the board which is, I suppose, what true diaphragmizing intended-or not. It sounds as if the reasons for thinning were developed empirically rather than theoretically. Still, I do wonder what the arguments might be for and/or against especially in an RC&S board and especially in the upper part of the scale. Michael Spreeman has made some comments which also intrigue me regarding why one would thin only on one side of the panel (not on the cutoff side)-btw Michael, if I may ask (and if you don't want to say I understand), what style of boards are these? >From your comments I deduce that they are a combination of rib crowing with some compression. David Love www.davidlovepianos.com From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of PAULREVENKOJONES at aol.com Sent: Sunday, January 25, 2009 4:05 PM To: pianotech at ptg.org Subject: Re: [pianotech] Diaphragmizing In a message dated 1/25/2009 5:08:27 P.M. Central Standard Time, erwinspiano at aol.com writes: I suspect Ron is correct in that diaphramizing may have a greater influence on Compression type belly systems, yet it does make sense that thinning the sdbd. edge in appropriate areas offers more flexibility/bass response as well as overall response. I suspect the guys in the belly dept's of days gone by were as interested in there outcomes, were intelligent & interested in quality as we all are today. Dale As Nick has pointed out, because of concomitant issues, particularly with CC boards, the "offering" may or may not yet be measurable, good and wise intent or not. There is an intuitive correctness to the idea, but, as Ron and others have ever belabored, intuition is not science. It may be a wonderful starting point, and even an end point, but not the metrics in the middle. The belly guys I bet were really interested in outcomes, but they had to talk to the bean-counters and marketing chaps, as well. :-) Paul _____ A Good Credit Score is 700 or Above. See <http://pr.atwola.com/promoclk/100000075x1215855013x1201028747/aol?redir=htt p://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=Dec emailfooterNO62> yours in just 2 easy steps! -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090125/6619ad9c/attachment-0001.html>
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