[pianotech] Steinway L rebuild question

[A440A at aol.com]

Ed  writes:

<<   But the information you give indicates that the hammer bore distance 
is _not_ fine. Is the keyframe properly bedded? If so, you need to measure 
string height(A) and cener pin height of the hammer flange(B). Bore distance = 
A - B.  >>

         This calls up a question.  In order for the above to actually 
leave a hammer hitting the string at 90 degrees, it has to be assumed that the 
string is parallel to the keybed.  This is rarely the case in the upper two 
octaves, where strings rise from the capo to the bridge.  A boring done 
strictly on distance between stringheight and center pin height will often 
produce a hammer that is leaning distally upon string contact. 
     I use a set of measured borings as trials.  That way, I can lift them 
up to the string, place a square on the string and compare it to the 
centerline of the hammer, which is at 90 degrees to the shank.  This allows me to 
tell if the hammer is at 90 degrees to the string upon contact.  
Regards, 



Ed Foote RPT 
http://www.uk-piano.org/edfoote/index.html
www.uk-piano.org/edfoote/well_tempered_piano.html
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