<html><head><style type="text/css"></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">Ron N & RicB,</DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"> </DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">Thanks for the input. I'll look at it from a forensics point of view. I think there is an old pinblock in the shop that didn't get burned in campfires this summer.</DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"> </DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">Dave Davis<BR><BR></DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">----- Original Message ----<BR>From: Dave Davis <A href="mailto:dave@davispiano.com">dave@davispiano.com</A></DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">> Has anyone done a study of the negative effects that occur to a tuning <BR>> pin or the pinblock while tuning? I service a new-ish 7' Bosendorfer for <BR>> a Boeing engineer, who is a hobbist with older uprights and we've been <BR>> discussing the rigors the pin endures while being twisted and flexed, <BR>> and also the affect on the pinblock.<BR>>  <BR>> Dave Davis, RPT<BR>> Renton, WA<BR></DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><From: Ron Nossaman <rnossaman@cox.net><BR>Depends on what you mean by a "study". Sans committee, the <BR>effect on the pin will be inconsequential, and the effect on <BR>the block will be nearly so. By far, the greatest damage to <BR>the pinblock (not done at instillation) occurs with humidity <BR>swings over time.<BR>Ron N</DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"> </DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"> <DIV><From: RicB></DIV> <DIV>I dont think there has been any formal study.  But you dont need to look <BR>much further then your first set of removed pins to see what can happen. <BR>Pins bent, grooves often worn flat... then there is this tendancy for <BR>the holes to develope a kind of glaze-ing resulting in jerky pins.  I've <BR>heard it speculated on that this can have something to do with tuning <BR>styles. You could put some psuedo-math/physics on the table and look <BR>very coarsly at the kinds of stress levels that happen under different <BR>kinds of twisting forces from the tuning hammer.... but I think it would <BR>be difficult to conclude anything certain one way or the other.  But it <BR>might be fun !<BR><BR>Cheers<BR>RicB<BR><BR><BR><BR>     > Has anyone done a study of the negative effects that occur to a<BR>    tuning<BR>     > pin or the pinblock while tuning? I service a new-ish 7'<BR>    Bosendorfer for<BR>     > a Boeing engineer, who is a hobbist with older uprights and we've<BR>    been<BR>     > discussing the rigors the pin endures while being twisted and<BR>    flexed,<BR>     > and also the affect on the pinblock.<BR>     >  <BR>     > Dave Davis, RPT<BR>     > Renton, WA</DIV> <DIV id=highlighterDiv style="DISPLAY: none; Z-INDEX: -1; POSITION: absolute; BACKGROUND-COLOR: yellow"></DIV></DIV></div></body></html>