<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40"> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"/>  <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> Jurgen,<o:p></o:p> <o:p> </o:p> This is a 1967 M.<o:p></o:p> <o:p> </o:p> JB<o:p></o:p> <o:p> </o:p> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of Jim Busby Sent: Thursday, December 21, 2006 12:22 PM To: <st1:PersonName w:st="on">College and University Technicians</st1:PersonName> Subject: Re: [CAUT] Checking<o:p></o:p> </div> <o:p> </o:p> Jurgen,<o:p></o:p> <o:p> </o:p> I just checked an M and the distance is about an inch less, but there is a 3/16 increase from bass to treble. I’ll check some others. I’d like to know why too.<o:p></o:p> <o:p> </o:p> Jim<o:p></o:p> <o:p> </o:p> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of Jurgen Goering Sent: Thursday, December 21, 2006 12:04 PM To: caut@ptg.org Subject: Re: [CAUT] Checking<o:p></o:p> </div> <o:p> </o:p> <div> Yes, Thanks Alan for the S&S backcheck info. <o:p></o:p> </div> <o:p> </o:p> <div> One question: Given an assumed constant tail length and bore length (within bass and treble) I don't quite understand why the backcheck height "increases linearly (with respect to note number) from 3 3/8" for note # 1 to 3 9/16" for note # 88". <o:p></o:p> </div> <o:p> </o:p> <div> Can someone clarify this? <o:p></o:p> </div> <div> Also, would these dimensions be the same in all models? <o:p></o:p> </div> <o:p> </o:p> <div> Jurgen Goering <o:p></o:p> </div> <div> Piano Forte Supply <o:p></o:p> </div> <div> (250) 754-2440 <o:p></o:p> </div> <div> info@pianofortesupply.com <o:p></o:p> </div> <div> http://www.pianofortesupply.com <o:p></o:p> </div> <blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'> <o:p> </o:p> <div> Alan, <o:p></o:p> </div> <div> Thanks for the copy of the instructions. <o:p></o:p> </div> <o:p> </o:p> <div> The first time I heard of raising the backchecks was from Scott Jones <o:p></o:p> </div> <div> teaching at a regional seminar. I think he also talked about using a snap <o:p></o:p> </div> <div> ring pliers. Kevin Stock, also with S&S for a time, had a modified snap <o:p></o:p> </div> <div> ring pliers with a slot cut out for the wire. He would just lift them, then <o:p></o:p> </div> <div> even them out. I think that's because he knew what he was doing <o:p></o:p> </div> <div> intuitively. It was Roger Jolly that I first heard put some numbers which I <o:p></o:p> </div> <div> need with the idea;.... tail arc radius at 1/2 the hammer hanging distance <o:p></o:p> </div> <div> (usually right around 2 1/2), shank intersecting roughly the top 1/3 of the <o:p></o:p> </div> <div> backcheck (this does not need to be fussed with if the hammer line gets <o:p></o:p> </div> <div> raised from filing or whatever), and the backcheck angled back 18 degress <o:p></o:p> </div> <div> from vertical (pretty similar to the 68 or 70 degrees you work from, just <o:p></o:p> </div> <div> different point of reference and 4 deg. different). I always enjoy hearing <o:p></o:p> </div> <div> the different approaches to the same thing, because not all things work the <o:p></o:p> </div> <div> same for everyone, (not wrong, just different) and it is also good to get <o:p></o:p> </div> <div> something reaffirmed by a seperate source. A different perspective can <o:p></o:p> </div> <div> turn the light bulb on. <o:p></o:p> </div> <o:p> </o:p> <div> Tim G <o:p></o:p> </div> <blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'> <o:p> </o:p> <div> Attached is a S&S document about installing backchecks. <o:p></o:p> </div> <o:p> </o:p> <div> Have a great break! <o:p></o:p> </div> <o:p> </o:p> <div> Alan <o:p></o:p> </div> <o:p> </o:p> </blockquote> </blockquote> </div> </body> </html>