This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Bingo, Bango, Bravo. Well done! =20 Completely loose. I assume the mechanics were as follows: Since the = joint was unglued, when the hammer was thrown forward, the catcher, from = inertia, would slide backwards towards the backcheck. Then, when the backcheck = hit the catcher, energy is absorbed in reseating the catcher. It has been demonstrated that a properly checked upright hammer actually results in = a slight back-bending of the backcheck wire, the whole assembly is kind of wedged together. In our case, here, that couldn't happen and checking, = as I say, could not happen no matter how the backcheck was adjusted. =20 I didn't think to check this joint until I noticed that my "perfect" backcheck alignment was a little off after a couple of test blows. But = the backcheck kept pushing the catcher in so it always looked "right." =20 Fix? Glob of Tightbond. =20 I'm curious, Michael, had you seen this or was it just a logical guess? =20 Alan R. Barnard Salem, MO -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On = Behalf Of Michael Spalding Sent: Monday, March 21, 2005 1:13 PM To: Pianotech Subject: RE: Instructive Challenge of the Day Loose joint where catcher attaches to butt? =20 =20 ----- Original Message -----=20 From: HYPERLINK "mailto:tune4u@earthlink.net"Alan=20 To: HYPERLINK "mailto:pianotech@ptg.org"Pianotech Sent: 3/21/2005 11:57:46 AM=20 Subject: Instructive Challenge of the Day Upright 1890 Kranich & Bach, in very good condition after much work, had = a treble hammer that bobbled a bit.=20 =20 Checked regulation points, all similar to its neighbors which worked = fine. Held the left pedal down a bit; didn't help. Tried the key with fewer = front rail punchings; no help.=20 =20 Realized the hammer wasn't checking at all. Tried adjusting backcheck; hammer would not check in any position! Made double-sure backcheck was aligned squarely to catcher and that felt and leather were good--same as neighboring notes. =20 Hmmm. =20 Perfectly squaring and aligning the backcheck was what led to the proper diagnosis (hint) but did not improve checking at all. Repair took a = about 30 seconds and did not require turning any screws or any regulating. In = fact, I used no tools at all. Hammer now checks perfectly, wherever I want to = adjust it. =20 Age of piano is a hint, although the problem had nothing to do with the brand of the piano or it's action design which is very "modern," at = least as far as wippens, hammers, and butts go (but don't get me started on it's rocker capstans and short, secondary stickers that are attached with = screws to the capstans). The point is, this problem could occur in ANY upright = but is more likely in an old one. =20 No purchase required to enter.=20 =20 Alan R. Barnard Sendin' Out Stumpers From Salem, MO =20 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.4 - Release Date: 03/18/2005 -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.4 - Release Date: 03/18/2005 --=20 No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.4 - Release Date: 03/18/2005 =20 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/b9/95/f2/dc/attachment.htm ---------------------- multipart/alternative attachment--
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