<HTML>In a message dated 1/19/2002 11:23:14 AM Pacific Standard Time, RNossaman@KSCABLE.com writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Subj:Re: Baldwin accu-hitch pins Date:1/19/2002 11:23:14 AM Pacific Standard Time From:<A HREF="mailto:RNossaman@KSCABLE.com">RNossaman@KSCABLE.com</A> Reply-to:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A> To:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A> Sent from the Internet > >  Ron (somebody) tell me what I'm missing on the acujust in a way I can absorb > it. What's that you say? not possible. hmmmmmmm >        >        Dale Erwin Dale, I'm not sure what the question is here. Like you have adjusted plate height to fine tune bearing, you can do the same thing section by section, or note by note with the hitch pin adjustment. Your initial plate height is determined just like you would normally do it, only your back scale target isn't the top of an aliquot, but a vertical position on the hitch.</BLOCKQUOTE> Hi Ron   Ok I get this sort of but the place where I'm hung up is that as you start driving the strings down on the hitch your bearing increases as does the amount the board is compressing as you go. Just like in pitch raising. So how do you know when enough is enough and when do you know that there is enough ,of the desired deflections so often discussed. Meaning a 1 to 11/2 degree angle of deflection depending where in the scale we are talking about. Dale If you shoot for somewher <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">around 4mm up the hitch as a target, you have some room for final vertical positioning as you find necessary. </BLOCKQUOTE> Ron    Once again how could a person possibly know what the final position is? Does that make sense?       Ron      Uhhh not yet Ron.  I must be coming at this from a really strange angle of comprehension. I took Stacy Yokums class in Reno and he couldn't answer my question either. I wasn't the only one asking it either.   Let me try another way by explaining where I'm coming from.   Ok Take a new board and new set of too tall bridge caps. Install plate and cut the tops so that without any load on the board you have a 1 degree angle of deflection in the lower tenor rising to 1& 1/2 degrees thru the tenor right  up to note 88. Now install all the strings from the tenor /bass break to 1st capo section at. Tune these up to pitch. Before you string further take a bearing string and check the remaining deflection. Meaning once again that the soundboard is sinking under down bearing pressure as we go. If done this way I can guarantee an insuffiecnt amount of bearing to drive the treble in your shiny new board. The bearing string will probably touch bridge and aliqot at the same time or almost but that isn't enough bearing for trebles.     In fact I you can't even read much deflection with the string at all. Unfortunately this is the very method Nick Gravagne outlined in the journal many years ago and it doesn't work unless you pre- stress the board some. He didn't correct or I should say amend it and I only found out he was using pre stressing and the 1 1/2 degree angle of deflection in one of my conversations with him a year or so ago.      MY point oh yes is how in the acujust system does one approximate total and adequate deflection with any confidence that your not creating the problem I described above.    My answer so far is that you can't. Its more of a guesstimate than I'm willing to make until somebody can give me some clarification.   Does this help to see my angle of deflection!!!!!!!                                 Dale Erwin <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"> Ron N</BLOCKQUOTE> </HTML>