This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment 3/8". Terry Farrell ----- Original Message -----=20 From: Richard Strang=20 To: 'Pianotech'=20 Sent: Thursday, October 30, 2003 3:50 PM Subject: RE: Pinblock Separation Repair & Pitch Change Thanks for the info, Terry. I have to go make that very repair to a = piano shortly and was contemplating whether or not to lower the pitch = first. It this case, the separation is about 1/2" in the bass and about = 1/4" in the treble. Those pesky little termites are in there, too. I = think they are causing the problem. They are not in the pinblock, = though, so the piano is in tune, though 200 cents flat. I was also wondering what size bolts to use, 1/4", 3/8"? What do = you recommend? Thanks. Richard -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On = Behalf Of Farrell Sent: Thursday, October 30, 2003 8:09 AM To: pianotech@ptg.org Subject: Pinblock Separation Repair & Pitch Change Differing opinions regarding the benefit of lowering pitch prior to = drawing a pinblock/backpost separation back together have been expressed = on this list. I am one that generally feels more comfortable lowering = pitch. I thought it might be of benefit to put some numbers on potential = pitch changes.=20 Yesterday I did one of these repairs on a late model (1980s) Baldwin = Acrosonic console. It had an approximate 1/4-inch separation between the = pinblock and the backposts and deadwood back assembly. The separation = had been "repaired" in the past with something that appeared to be = silicone bathtub adhesive - surprisingly (?) the separation appeared to = have widened since the application of the silicone. The piano was tuned = at that time (and presumably tuned at standard pitch).=20 Prior to my repair the piano was fairly uniformly 75 cents flat. I = dropped the pitch to between 200 and 250 cents flat prior to any = clamping. I yucked in West System epoxy thickened with #403 Microfibers. = (A fine fiber blend, is used as a thickening additive with = resin/hardener to create a multi-purpose adhesive, especially for = bonding wood. Epoxy thickened with microfibers has good gap-filling = qualities while retaining excellent wetting/penetrating capability.) I = drew the gap closed slowly going back and forth among the six 3/4" pipe = clamps (of which two got bent pretty good!). The separation appeared to = close very close to 100%. I then checked pitch again. Piano was fairly uniformly about 75 = cents flat. Therefore, it appears that closing the 1/4-inch gap resulted = in a pitch increase of approximately 150 cents. I will be going back to the job on Friday morning to install a few = through bolts, remove clamps, pitch raise and tune. If there is anyone = out there that perhaps has not seen this repair done (or whoever for = whatever reason) wants to see a few photos, I will take them Friday = morning. Let me know. Terry Farrell ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/61/81/15/3e/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC