<!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 6.00.6000.16608" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: #ffffff" bgColor=#ffffff> <DIV>Julia,</DIV> <DIV>To do this work you'll need a set of gram weights. They are for sale at most of the supply houses. With these weights you can place an exact amount on the end of the key, say 50 grams, with the damper pedal depressed (important), see if the key will fall to the point of let off. We are only concerned with the travel of the key from it at rest up position down to the point of let of. The lowest amount that will cause the key to drop (with the damper pedal depressed) is the down weight. Then depress the key to let off and place an amount on the key, the most the key will lift up to it's at rest position is the upwieght, maybe around 25 grams. A little taping on the key bed to get things to move is OK. You need to try some of this before trying to figure it all out. Once you've spent some time with it you'll find it opening doors to a higher level of action work. There is lot's to understand. Read the Stanwood articles in the PTJ, I think they were early '90s. Use the PTJ on CD.</DIV> <DIV>Fenton</DIV> <BLOCKQUOTE dir=ltr 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=KeyKat88@aol.com href="mailto:KeyKat88@aol.com">KeyKat88@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> Sunday, February 17, 2008 3:22 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Measure friction weight was: Weighting upright keys question</DIV> <DIV><BR></DIV> <DIV> <DIV>Greetings,</DIV> <DIV> </DIV> <DIV>             So how do I start making measurements to see what weight a key(s) neeeds?  How do I measure friction? I am guessing that I should start  by measauring the the foot-lbs (or cm-grams?)  inertia it takes to start the power stroke at the wippen heel/foot. Then I have measured my fricion...right? Then I can do the uw/dw calculations.</DIV> <DIV> </DIV> <DIV>Julia </DIV> <DIV>Reading. PA</DIV> <DIV> </DIV> <DIV>In a message dated 2/16/2008 11:27:46 PM Eastern Standard Time, fmurray@cruzio.com writes:</DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT face=Arial size=2>Given a certain friction in the piano we are going to want to set up something like maybe a downweight (dw) of 50 and an upwight (uw) of 25. All numbers in grams. This is assuming a friction of 12.5.</FONT></BLOCKQUOTE></DIV> <DIV></DIV><BR><BR><BR> <DIV><FONT style="FONT: 10pt ARIAL, SAN-SERIF; COLOR: black"> <HR style="MARGIN-TOP: 10px"> Delicious ideas to please the pickiest eaters. <A title=http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/2050827?NCID=aolcmp00300000002598 href="http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/2050827?NCID=aolcmp00300000002598" target=_blank>Watch the video on AOL Living.</A></FONT></DIV></BLOCKQUOTE></BODY></HTML>