<!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 6.00.2800.1476" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Are you using a flex shaft tool,and at = what rpm? The one I use is a flex shaft some 40 years old and low = speed.I do two passes, one from the 'under' side of the hammer midway over the strike point,and one down. This leaves a little 'bead' at = the point that can be  by 'light' paper sanding or the 'juice' of = choice give good results when the action is replaced in the piano. I do not do = this in the home, and include it in other action work deemed necessary... as = they all do! </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Hubert Liverman</FONT></DIV> <DIV><FONT face=Arial size=2>Tuner/tech</FONT></DIV> <DIV><FONT face=Arial size=2>Opelika, AL</FONT></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"><B>Subject:</B> Re: fine grit hammer filing</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>Keep in mind that the only time I do = this is when trying to salvage an old ready-for-the-grave trashy upright. Do I = voice afterwards? No. Does the piano sound good when I am done? No. Does it = sound better than it was? Yes. Can I do a crude regulation now? Yes. I only = remove felt down to the bottom of the grooves, but yes, this often leave the = hammers will very little felt - but again, trashy pianos only here. = </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>After a few attempts, I have worked = out a one-swoosh technique for using the Dremel hammer file tool. I start at = 8 o'clock and swoosh right around the whole hammer to a good 4 o'clock (basically from staple to staple). Once you get the hang of it you get = a real nice smooth hammer surface, good shape, and you go so fast that there = is no burning or anything even close to that.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Terry Farrell</FONT></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=quentin.codevelle@tiscali.fr href="mailto:quentin.codevelle@tiscali.fr">Quentin Codevelle</A> = </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, November 14, = 2004 9:41 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> fine grit hammer = filing</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>Hi Terry,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I tried the router-shaper thing a = few times on extremely grooved hammers.</FONT></DIV> <DIV><FONT face=Arial size=2>I don't like this solution very = much because I had the impression the machine is heating the felt very much, = resulting an awful tone,real harsh with a lot of voicing work to do after = the shaping machine operation.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Of course it is fast, but the other = problem is you have to get the habit of using it, because I saw some hammers = shaped with this shaper by someone who never did this kind of work before, = and it was a total disaster.</FONT></DIV> <DIV><FONT face=Arial size=2>The hammer set was totally ruined, = with not enough felt left, and an awful hammer shape.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>What is your experience with it? = </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Quentin</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>