This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hi David, and gang, Thanks for the different suggestions as to how to measure the crown. = I've not measured crown on the top of the board before, as you never = know what has been the practice, regarding thinning of the board, of the = original factory. On this piano, with the maple stiffener on the bottom = of the long bridge, my usual fishing line could not be used. So, I = clamped a straight edge, across the bottom of the piano, and measured up = to the board at the rim or cut off, and also on both sides of the long = bridge. Move the straight edge a foot down the piano, and measure = again. Yes, I think the board has crown, on both sides of the bridge, = (I raised the pitch to A430), from the belly bar back until almost the = top of the base bridge. At that point, the crown remains 1/16"positive = on the bent side, but drops to less then 1/16'negative on the straight = (base bridge) side. There is no measurable positive downbearing on the base bridge, and the = base section wishes it could sound as good as a washtub, mop handle = configuration...it doesn't. The low tenor suffers from duck quacking or = puppy barking syndrome, I'm not sure which. The middle treble up to 88 = is another story. Somewhat thin, but has respectable sustain, and lots = of false beats. How you measure downbearing on that long bridge would be = a pearl of wisdom...? I really want to fix this instrument properly, (have to convince the = client), so I really welcome all comments and suggestions. After = reading Del's comment's about the tension on these pianos, I've ordered = Tremaine Parson's Pscale program, and dug out Jim Hayes chapter in John = Travis' book. I'll have to find the journal articles, that I never = bothered to read on string behaviour and scale design. I have always = thought that it was a little presumptuous, for myself, to attempt to = redesign, rather then rebuild pianos. I refer to what I have been doing = as conservative rebuilding, because my goal has been to put each piano = back the way it was, when it was new. Anyway, seems it's time for a = more progressive approach. I'm leaning towards a new board with a = conventional cap. If this is a mistake, please don't wait to tell = me..... By the way, I think this piano would qualify as an art case, some artist = went and painted it white, I could send along a picture if there is = interest...sorry about the long post. Better get to work.... Thanks in = advance for your advice, and suggestions. Owen. ---- Original Message -----=20 From: David Skolnik=20 To: pianotech@ptg.org=20 Sent: Friday, March 22, 2002 1:58 AM Subject: Re: Sohmer=20 Owen - Have you had a chance to measure the downbearing and, if so, how did = you do it? David Skolnik At 09:08 PM 03/05/2002 -0500, you wrote: Del, Dale, Jim, Robert, Wim and everyone else... =20 When the piano arives, the very first thing I am going to do is = measure the down bearing and see if I can determine just what direction = the board is crowned. I spoke to the owner of the piano again today, I = asked him if he found the serial number...Oh yes, says he, it's easy to = remember to..... A435.( Del.. What was that you said about extremely = high scale tensions...highest I've ever measured?.) Would you want to = lower the tension so the piano could comfortably be raised to 440? I = think I'm in about as deep as I can stand for one day. By the way.. you guys are truly a great resource. Thanks for your = interest and support. I will keep all posted on this one. Thankyou, Owen. ----- Original Message -----=20 From: Erwinspiano@AOL.COM=20 To: pianotech@ptg.org=20 Sent: Tuesday, March 05, 2002 6:43 PM=20 Subject: Re: Sohmer=20 In a message dated 3/5/2002 9:27:35 AM Pacific Standard Time, = pianobuilders@olynet.com writes: Subj:Re: Sohmer =20 Date:3/5/2002 9:27:35 AM Pacific Standard Time=20 From:pianobuilders@olynet.com=20 Reply-to:pianotech@ptg.org=20 To:pianotech@ptg.org=20 Sent from the Internet=20 ----- Original Message -----=20 From: Erwinspiano@AOL.COM=20 To: pianotech@ptg.org=20 Sent: March 05, 2002 6:12 AM=20 Subject: Re: Sohmer=20 Has anybody had experience with a Sohmer piano with agraffes = on the long bridge?=20 Thankyou,=20 Owen Owen=20 Yes I have and they went all the way up. I wrote of this = before but this piano had agraffes all the way up and the board was a = reverse crown design. Freak design but awesome sound. A difficult on to = string> Hmmmm.... Are you sure those were reverse crown by design? Those = I've done had positive crown. And extremely high scale tensions -- = highest I've ever measured. Around 62,000 lbs (28,000 kgf +) or better = as I recall. Took some doing to bring it down and retain the agraffe = design (as per the customers request). Del=20 Am I sure. Hmmmmmmm You know my wife is the one who usually ask that question and = generally try to be sure and in this case it was too intentional to be = an accident. A string across the under side of the belly in many places = showed the ribbing to be very uniform and symetrical (o.k. Quasi you = know what I mean) You could have made salad nicely in it once the = strings were off. Also the bearing was still adequately positive and = also intentional looking and reasonable. Sustain as long as your life. I = don't know I liked it. It had what I call the magic soundboard syndrome. = Any things possible I guess but if it was an accident ,which I doubt, If = it ain't broke don't fix it.=20 >>>>>>>>>>>Dale>>>>>>>>>>>=20 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/26/c5/b8/7e/attachment.htm ---------------------- multipart/alternative attachment--
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