>I wouldn't mind a counter bore that would maintain a shoulder Jude, Here are some photos of a counter bore I had a machinist modify, solves the problem. I had a little trouble reading the exact angle I wanted off another agraffe, although I'm not sure there is a magic number. Anyway, I think I used about 13 degrees. This is for reducing the height of new agraffes while maintaining the angled shoulder. Fenton ----- Original Message ----- From: "Jude Reveley/Absolute Piano" <juderev at verizon.net> To: <pianotech at ptg.org> Sent: Thursday, March 26, 2009 7:35 AM Subject: Re: [pianotech] Managing agraffes was Increasing bridge height > Thank you for a well reasoned response, Frank. (BTW great cap/whip > post-I'm still mulling). > > Now, it is not uncommon to arrive at the proper agraffe angle somewhere at > or before the border torque specification of "finger tight." My procedure > has been to bring it around another 180 degrees for all the reasons > mentioned in this thread, and I willingly admit this will occasionally > twist me out of my own comfort zone for fear that I might be stressing the > agraffe at the threads leading to all kinds of imagined catastrophies, > present or future. I've used washers and counterbores but am not wholely > satisfied with those techniques because of their inherent disadvantages, > namely time consumption and flattening the shoulder at the base; so I'm > looking for options. > > I wouldn't mind a counterbore that would maintain a shoulder. Suppliers? > Listening? Jurgen? I could especially use it for those fun vintage > Becksteins. > > So based on this survey, I suppose I'll stick with tight; but I'm still > trying to get a sense of when is too tight. I figure if I had a spec for > this limit, I could take some measurements and develop the feel. Then I > can get on with it, as Ron suggested. > > As to new agraffes vs. old, for me it comes down to weighing the > cost/benefit. Polishing old ones remains more expensive than buying new > ones and spending a little extra time refining the holes. I save the old > ones for when this may not be the case. I borrowed my method from > Paul-Flitz on a quill-like buffer in a dremel or foredom. > > Paul: Hoping you still read every post with "agraffe" in the tiltle...what > are you using for a buffer? I find are q-tips too big. I made some from > hammer felt scraps but am interested trying something store bought? > > Thanks, > > Jude Reveley, RPT > Absolute Piano Restoration, LLC > Lowell, Massachusetts > (978) 323-4545 > > ----- Original Message ----- > From: <pianoguru at cox.net> > To: <pianotech at ptg.org> > Cc: "Jude Reveley/Absolute Piano" <juderev at verizon.net> > Sent: Thursday, March 26, 2009 8:33 AM > Subject: Re: [pianotech] Managing agraffes was Increasing bridge height > > >> ---- Jude Reveley/Absolute Piano <juderev at verizon.net> wrote: >>> Did you interpret the use of threadlock to be in the agraffe hole or at >>> the >>> threads. I can imagine threadlock around the agraffe threads robbing >>> only as >>> much energy as a tuning pin bushing. How is this related to a rigid >>> terminus? >> >> With or without thread lock, if the agraffe is loose, ie. lacking solid >> contact around the head of the stud in the counterbore, this constitutes >> something less than a rigid terminus. To suggested the possibility of >> vibration of the agraffe, in itself, constitutes lack of rigidity. >> >> To suggest the use of Thread Lock is concede that potential vibration is >> a legitimate concern. To suggest a softer fomulation of Thread Lock in >> the interest of serviceability is to defeat the argument for its use in >> the first place. >> >> Putting aside the concerns for vibration and rigidity, do you suppose it >> would be an acceptable practice to finger tighten all agraffes, and back >> them off from finger-tough, to align each agraffe to an alignment >> perpendicular to its speaking length(s)? I've seen this in new piano >> production. It's not pretty. All I'm saying is that nothing short of >> tightening the agraffes beyond finger-tight, will insure a rigid terminus >> and proper alignment. >> >> Frank Emerson >> >> >> > > > > -------------- next part -------------- A non-text attachment was scrubbed... Name: Aggraffe 001.jpg Type: image/jpeg Size: 111830 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090326/609930b8/attachment-0003.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: Aggraffe 002.jpg Type: image/jpeg Size: 110423 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090326/609930b8/attachment-0004.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: Aggraffe 003.jpg Type: image/jpeg Size: 94171 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090326/609930b8/attachment-0005.jpg>
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