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<DIV><FONT face=Arial size=2>David S.</FONT></DIV>
<DIV><FONT face=Arial size=2>Please clarify Efficiency Ratio. Weight Ratio
divided by Distance Ratio? Lights are coming on and someone might actually be
home. I'll be glad to study links you might provide if that waves you some
verbiage here.</FONT></DIV>
<DIV><FONT face=Arial size=2>Fenton</FONT></DIV>
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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=erwinspiano@aol.com
href="mailto:erwinspiano@aol.com">erwinspiano@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> Monday, October 06, 2008 8:07
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Low Inertia</DIV>
<DIV><BR></DIV><BR><FONT face="Arial, Helvetica, sans-serif"> Hi
David<BR> <BR> No..Just me. I missed the string height
business. D's are an engaging study in ...the huh? factor. Love em fix
em.. Listen to great music on em. Get paid to fix em. Doesn't get any
better.<BR> Dale<BR></FONT><BR>
<DIV id=AOLMsgPart_0_4c7a3705-5fce-4984-8c00-d7278bc30370
style="FONT-SIZE: 12px; MARGIN: 0px; COLOR: #000; FONT-FAMILY: Tahoma, Verdana, Arial, Sans-Serif; BACKGROUND-COLOR: #fff">Hi
Dale, <BR> <BR>Your e-mail came through with alot of question
marks!!! I think your computer is confused..... <BR> <BR>As I said
the cp heights were all almost 1/4" low.... and the string height was a little
high.. we raised the stack up as high as we could without the drop screws
being in danger of hitting the wrest plank. This was a 1947
D. <BR> <BR>Chris Solliday and I worked on a 1946 D which had the
cleats in backwards The wip centers were way way low... no one could ever
regulate that piano until we put the cp heights back to spec by replacing and
reorienting the cleats.... and getting the cp heights back to
spec... <BR> <BR>I think it was so soon after the war effort and
maybe they were out of practice after making so many
Gliders....! <BR> <BR>David <BR> <BR>? David <BR>?
This?is a fascinating development! I'm curious. How high was the hammer flange
center pin from the keybed before it you moved it up??The blow was the same
? <BR>? By the way what vintage of D? Do we ever know enough...rhetorical
question <BR>? Thanks <BR>?? Dale <BR>? <BR> <BR>Dear
all,? <BR>? <BR>Before these related threads scatter into oblivion I
want to restate what I've already mentioned in the Journal past: it is my
observation that distance ratio divided by weight ratio yields something I
call the efficiency ratio which is a ratio of
ratios....? <BR>? <BR>As an example I was recently working in John
Foys shop to help install a Precision Touch Design in a Steinway D. We found
that with a 5.5 ratio the distance ratio was 5.0. The efficiency ratio was .9
and the action required a .430" dip with a 1.75" blow.... We checked the
action center elevations and the whole stack was low by almost 1/4".
Rechecking the ratios the weight ratio was 5.3 and the distance ratio up to
5.7 which was kind of astonishing. The efficiency ratio was now 1.1 and the
action regulated with .400 dip...? <BR>? <BR>This is just one
example and I'm collecting much more data to formally publish but I can say at
this stage that it is my conclusion that the efficiency ratio should be above
1.0 for good results...? <BR>? <BR>To me distance ratio comes under
the heading of geometry and is related to arcs and their angular interaction
whereas the strike weight ratio is a result of vertical gravitational
vectors.? <BR>? <BR>I like what Fenton said.... it's about Hammer
Weight, Action Ratio, Geometry and Friction....? <BR>? <BR>Onward
and upward....? <BR>? <BR>David Stanwood? <BR></DIV><!-- end of AOLMsgPart_0_4c7a3705-5fce-4984-8c00-d7278bc30370 -->
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