<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML style="FONT-SIZE: x-small; FONT-FAMILY: MS Sans Serif"><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; = charset=windows-1250"> <TITLE>Message</TITLE> <META content="MSHTML 6.00.2900.2604" name=GENERATOR></HEAD> <BODY> <DIV><SPAN class=527553319-21032005><FONT face=Arial size=3>Bingo, = Bango, Bravo. Well done!</FONT></SPAN></DIV> <DIV><SPAN class=527553319-21032005><FONT face=Arial size=3></FONT></SPAN> </DIV> <DIV><SPAN class=527553319-21032005><FONT face=Arial = size=3>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.</FONT></SPAN></DIV> <DIV><SPAN class=527553319-21032005><FONT face=Arial size=3></FONT></SPAN> </DIV> <DIV><SPAN class=527553319-21032005><FONT face=Arial size=3>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."</FONT></SPAN></DIV> <DIV><SPAN class=527553319-21032005><FONT face=Arial size=3></FONT></SPAN> </DIV> <DIV><SPAN class=527553319-21032005><FONT face=Arial size=3>Fix? = Glob of Tightbond.</FONT></SPAN></DIV> <DIV><FONT face=Arial size=3></FONT> </DIV> <DIV><SPAN class=527553319-21032005><FONT face=Arial size=3>I'm = curious, Michael, had you seen this or was it just a logical = guess?</FONT></SPAN></DIV> <DIV><SPAN class=527553319-21032005><FONT face=Arial size=3></FONT></SPAN> </DIV> <DIV align=left><FONT face=Arial size=2>Alan R. = Barnard</FONT></DIV> <DIV align=left><FONT face=Arial size=2>Salem, MO</FONT></DIV> <BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px"> <DIV></DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr = align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <B>On = Behalf Of </B>Michael Spalding<BR><B>Sent:</B> Monday, March 21, 2005 1:13 PM<BR><B>To:</B> Pianotech<BR><B>Subject:</B> RE: Instructive = Challenge of the Day<BR><BR></FONT></DIV> <DIV>Loose joint where catcher attaches to butt?</DIV> <DIV> </DIV> <DIV></DIV> <DIV> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid"> <DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=tune4u@earthlink.net = href="mailto:tune4u@earthlink.net">Alan</A> </DIV> <DIV style="FONT: 10pt arial"><B>To: </B><A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech</A></DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> 3/21/2005 11:57:46 AM = </DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Instructive = Challenge of the Day</DIV> <DIV><BR></DIV><FONT size=2> <DIV><SPAN class=715383417-21032005><FONT face=Arial>Upright = 1890 Kranich & Bach, in very good condition after much work, had a treble = hammer that bobbled a bit. </FONT></SPAN></DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial>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. </FONT></SPAN></DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial>Realized = the hammer wasn't checking at all. Tried adjusting backcheck; <EM>hammer would not check in any position!</EM> Made double-sure backcheck was = aligned squarely to catcher and that felt and leather were good--same as = neighboring notes.</FONT></SPAN></DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial>Hmmm.</FONT></SPAN></DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial>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.</FONT></SPAN></DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial>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.</FONT></SPAN></DIV> <DIV><SPAN class=715383417-21032005></SPAN><SPAN class=715383417-21032005></SPAN><SPAN = class=715383417-21032005><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=715383417-21032005><FONT face=Arial>No purchase = required to enter. </FONT></SPAN></DIV> <DIV><SPAN class=715383417-21032005><FONT = face=Arial></FONT></SPAN><SPAN class=715383417-21032005><FONT = face=Arial></FONT></SPAN> </DIV> <DIV align=left><FONT face=Arial size=2>Alan R. = Barnard</FONT></DIV> <DIV align=left><FONT face=Arial><FONT size=2><SPAN class=715383417-21032005>Sendin' Out Stumpers From </SPAN>Salem, MO</FONT></FONT></DIV> <DIV> </DIV></FONT><BR> <P><FONT size=2>--<BR>No virus found in this outgoing = message.<BR>Checked by AVG Anti-Virus.<BR>Version: 7.0.308 / Virus Database: 266.7.4 - = Release Date: 03/18/2005<BR></FONT></P></BLOCKQUOTE><BR> <P><FONT size=2>--<BR>No virus found in this incoming = message.<BR>Checked by AVG Anti-Virus.<BR>Version: 7.0.308 / Virus Database: 266.7.4 - = Release Date: 03/18/2005<BR></FONT></P></BLOCKQUOTE></BODY></HTML> <BR> <P><FONT SIZE=2>--<BR> No virus found in this outgoing message.<BR> Checked by AVG Anti-Virus.<BR> Version: 7.0.308 / Virus Database: 266.7.4 - Release Date: = 03/18/2005<BR> </FONT> </P>