<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> <HTML> <HEAD> <META content=text/html;charset=iso-8859-1 = http-equiv=Content-Type> <META content='"MSHTML 4.72.3110.7"' name=GENERATOR> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT color=#000000 size=2>Can anyone explain me the theory = about relationship upweight and downweight?</FONT></DIV> <DIV><FONT color=#000000 size=2></FONT><FONT size=2>How do you = messure in practise the upweight on a key?</FONT></DIV> <DIV><FONT size=2>Does anybody have experience with those little loads = you can screw with two screws under the key for reducing the downweight, instead = of drilling a hole and hitting the loads in with a hammer.</FONT></DIV> <DIV><FONT size=2>I ask this questions because I need to make  = less downweight on an old german grand Altman ° 1900, (the action is not = with rollers on the shanks, is like an uprightaction.)</FONT></DIV> <DIV><FONT size=2>The technician who advices me is worried that the = wood of the keys is old and meaby will splitt or brake when you drill and hit the = loads in.</FONT></DIV> <DIV><FONT size=2>Thank you for advice.</FONT></DIV> <DIV><FONT size=2><A href="mailto:danny.boddin@planetinternet.be">danny.boddin@planetinterne= t.be</A></FONT></DIV> <DIV><FONT size=2></FONT><FONT color=#000000 size=2>Danny Boddin Pianoservice</FONT></DIV> <DIV><FONT color=#000000 size=2></FONT><FONT = size=2>Loddershoekstraat 4</FONT></DIV> <DIV><FONT size=2>B1741 Belgium</FONT></DIV> <DIV><FONT size=2>mobilphone 00 32 (0)75 43 38 43</FONT></DIV> <DIV><FONT size=2>Fax 00 32 (0)2 582 32 07</FONT></DIV> <BLOCKQUOTE style="BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: = 5px"> <DIV><FONT face=Arial size=2><B>-----Oorspronkelijk bericht-----</B><BR><B>Van: </B>Vince Mrykalo <<A href="mailto:Vince@byu.edu">Vince@byu.edu</A>><BR><B>Aan: = </B><A href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> <<A = href="mailto:pianotech@ptg.org">pianotech@ptg.org</A>><BR><B>Datum: = </B>donderdag 4 maart 1999 18:37<BR><B>Onderwerp: </B>Re: Touch weight<BR><BR></DIV></FONT>Do you have wippen helper springs in that = action?  To remove weight from the hammers, use the end of a = belt sander and remove material from the sides about an inch and a half = down from the crown.  That will give you a sort of hour-glass figure to = the hammers if you were to look at them from the front or back.  = <BR>Don't go by the up and down weights alone after you do = this. </BLOCKQUOTE> <BLOCKQUOTE style="BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: = 5px">Make sure that the balance weight (upweight plus downweight divided by = two) stays consistently between 35 and 37.<BR><BR>At 11:36 PM 3/3/99 -0500, you = wrote: <BR><BR> <BLOCKQUOTE cite type = cite>Another way you may want to try is to = lighten the hammers.  Are you a good hammer filer?  = I've done this on several occasions and it works!  There's a lot of = felt on most of the hammers you can buy today.  I think most of the = sets I've ordered, regardless where they were from, were larger than = they needed to be.  One thing you'll have in your favor is the = way the action geometry will affect how much felt you'll need to = remove.  If the hammer travels 1 7/8 in, while the key travels 3/8 in., = that's a ratio of 5 to 1.  If you remove aprox. 2 oz. of weight from = the hammer, you'll remove aprox. 10 oz. of touchweight.  = Depending upon how well the action is weighted now, and upon how even you file = those hammers, you may need to do some work with the key weights to = even out the touchweight. <BR><BR><BR><BR>Rogerio Cunha wrote: <BR> <BLOCKQUOTE cite type = cite><FONT size=2>To the listI am = just working on a grand ( Bösendorfer ) and on it I applied = new hammers ( original ) , new center pins, and others items as knuckles, etc, etc,All the material applied is original and = all the work was made with care and the final product was very, very = good except the touch weight.I did all that I learned and read = but wasn't possible to obtain 52 g on the 1st section, 50 g on the 2nd = section and 48 g on the 3rd and 4th section and this is the problem = that I want to know. ( these are manufacturer measurements)The = difference is about +10 g on each section.What to do?I think that the = only way would be to put leads on the keys. Is this correct?To use = the piano with + 10g of touch weight is good?If isn't possible to = obtain the manufacturer measurements what are the good touch weight?I = thanks to allROGERIO CUNHA - IC MEMBER OF THE GUILD</FONT><FONT = size=3> </BLOCKQUOTE>  = </BLOCKQUOTE><BR></FONT><BR><B>Vince<BR></B><I><<A href="mailto:vince@byu.edu" eudora = autourl>mailto:vince@byu.edu</A>><BR></I>Visit the web page for = the Pacific Northwest Conference at: <BR><<A href="http://www.pnwpianoconf.com/" eudora = autourl>www.pnwpianoconf.com</A>> </BLOCKQUOTE></BODY></HTML>