<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2600.0" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT size=2>Dale:</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>I believe the Baldwin instructions call for setting = the bearing at zero degrees to begin with.   After pulling the = piano to pitch you then start at the bottom of the tenor (no bass strings = yet).  Tap down note 21 - 35 to 1/2 degree, 36 - 53 to 1 degree and 54 - 88 to 1 = 1/2 degrees--in that order.  Thus, the 1 1/2 degrees that you set the = upper range to is on a semi-compressed board, at least to the degree that = setting the bearing on the previous sections will compress it.  So notes 54 -88 = are actually set at greater than 1 1/2 degrees if you were measuring from = the point before the board had any downward pressure it.  Moreover, if you = were to go string by string, the measurable bearing after you got to the top would = be something less than your initial target.  The question seems = to be, when the board is already set with some bearing, but perhaps the wrong = bearing, how do you approach the problem?  Can you simply go through and = correct the bearing to read 1/2, 1, 1 1/2 degrees respectively?  I often wonder = whether we fret over this a bit too much.  I've heard good sounding boards = with a variety of downbearing measurements.  Though I have not heard one = of David Hughes' boards, the impression I get from him is that we sweat over this = a bit more than is necessary.  The factors that go into a good sounding = board are obviously greater than just the bearing measurements.  Teasing out = the variables is difficult, to say the least.  </FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>David Love</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2></FONT> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=Erwinspiano@AOL.COM href="mailto:Erwinspiano@AOL.COM">Erwinspiano@AOL.COM</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> January 19, 2002 2:07 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Baldwin accu-hitch = pins</DIV> <DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 = face=Arial size=2 FAMILY="SANSSERIF">In a message dated 1/19/2002 11:23:14 AM Pacific = Standard Time, <A = href="mailto:RNossaman@KSCABLE.com">RNossaman@KSCABLE.com</A> writes:<BR><BR><BR> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px" TYPE="CITE">Subj:<B>Re: Baldwin accu-hitch pins = </B><BR>Date:1/19/2002 11:23:14 AM Pacific Standard Time<BR>From:<A = href="mailto:RNossaman@KSCABLE.com">RNossaman@KSCABLE.com</A><BR>Reply-= to:<A href="mailto:pianotech@ptg.org">pianotech@ptg.org</A><BR>To:<A href="mailto:pianotech@ptg.org">pianotech@ptg.org</A><BR><I>Sent = from the Internet </I><BR><BR><BR><BR><BR>><BR>>  Ron (somebody) = tell me what I'm missing on the acujust in a way I can absorb<BR>> it. = What's that you say? not possible. hmmmmmmm<BR>>        <BR>>        Dale Erwin<BR><BR><BR>Dale,<BR>I'm not sure what the question is here. = Like you have adjusted plate height to<BR>fine tune bearing, you can do the = same thing section by section, or note by<BR>note with the hitch pin = adjustment. Your initial plate height is determined<BR>just like you would = normally do it, only your back scale target isn't the top<BR>of an aliquot, but = a vertical position on the hitch.</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF"></BLOCKQUOTE><BR><BR>Hi Ron<BR></FONT><FONT = lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF">  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.<BR>Dale<BR>If you shoot for somewher</FONT><FONT = lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF"><BR></FONT><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2 FAMILY="SANSSERIF"> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px" TYPE="CITE">around 4mm up the hitch as a target, you have some room = for final vertical<BR>positioning as you find necessary. </FONT><FONT = lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF"></BLOCKQUOTE><BR>Ron<BR></FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF">   Once again how could a person = possibly know what the final position is?</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF"><BR><BR><BR></FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF">Does that make sense?  = <BR>     Ron</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" = face=Arial color=#000000 size=2 FAMILY="SANSSERIF"><BR><BR>    </FONT><FONT = lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF"> 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.<BR>  Let me try another way by explaining where I'm = coming from.<BR>  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.<BR>    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.<BR>     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. <BR>   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.<BR>  Does this = help to see my angle of = deflection!!!!!!!<BR>        &nbs= p;  = <BR>           &nb= sp;         Dale Erwin</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" = face=Arial color=#000000 size=2 FAMILY="SANSSERIF"><BR></FONT><FONT = lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF"><BR> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px" TYPE="CITE"><BR>Ron N</BLOCKQUOTE><BR><BR></BLOCKQUOTE></FONT></FONT></BODY></HTML>