I think a hard knuckle would make more of a click than a bounce. But it could bounce, I suppose... Paul <table width=100%> <tr valign=top> <td width=40%>Willem Blees <wblees@bama.ua.edu> Sent by: caut-bounces@ptg.org 12/11/2006 02:27 PM <table border> <tr valign=top> <td bgcolor=white> <div align=center>Please respond to College and University Technicians <caut@ptg.org></div></table> <td width=59%> <table width=100%> <tr valign=top> <td> <div align=right>To</div> <td>College and University Technicians <caut@ptg.org> <tr valign=top> <td> <div align=right>cc</div> <td> <tr valign=top> <td> <div align=right>Subject</div> <td>Re: [CAUT] Oh WimBlees, you isn't off da hook!</table> <table> <tr valign=top> <td> <td></table> </table> <tt>Quoting Robin Blankenship <tunerdude@comcast.net>: > Wim, > > Any possibility that the hardness of the knuckle could contribute a > bit to > the bounce??? > > Robin Blankenship > Good question. Wim > > ----- Original Message ----- > From: "Willem Blees" <wblees@bama.ua.edu> > To: "College and University Technicians" <caut@ptg.org> > Sent: Monday, December 11, 2006 10:13 AM > Subject: Re: [CAUT] Oh WimBlees, you isn't off da hook! > > > > David > > > > Thanks for reminding me. Because of some scheduling conflicts, I'm > > working on it this Friday afternoon. > > > > But in addition to doing the wippens on the Concert Hall Steinway, > > I've been looking at other grand pianos, and found that most of > them > > have bobbling hammers, to some extent. I think this summer I will > > spend a considerable amount of time evaluating and correcting > wippens. > > > > During the first part of this thread, someone wrote a list of all > the > > possible reasons a hammer could bobble. Whoever that was, could > you > > post it again. The information could make for a nice article. > > > > Assuming the regulation is correct, one of the problems with > making > > the "perfect" adjustment to the wippen is that there are too many > > variables which are almost impossible to measure. For instance, > the > > touch. How soft can we hit the key and expect the hammer to check. > > Then there is the curvature and roughness of the hammer tail and > the > > rake and roughness of the back check. The strength of the spring, > and > > the condition of the spring groove can also have an impact. The > only > > thing we have control over is the gram resistance of the > balancier. > > > > Am I missing anything? > > > > Wim > > > > > > Quoting David Skolnik <davidskolnik@optonline.net>: > > > >> Hey Wim - > >> Just a friendly reminder.  Have you had a chance to look at the > piano > >> yet? > >> > >> David Skolnik > >> > >> > >> > >> At 08:58 AM 11/15/2006, you wrote: > >> >Since this thread got started with wippens, I want to report that > I > >> am > >> >not going to be able to do the work on the balanciers on the D > >> until > >> >Dec. 7. I will give a report once I'm done. > >> > >> > > > > > > Willem Blees, RPT > > Piano Tuner/Technician > > School of Music > > University of Alabama > > Tuscaloosa, AL USA > > > > Willem Blees, RPT Piano Tuner/Technician School of Music University of Alabama Tuscaloosa, AL USA </tt>