<font color='navy' size='2' face='Comic Sans MS, sans-serif'><font color="#000080" face="Comic Sans MS, sans-serif" size="2">Hi Ed</font>
<div><font color="#000080" face="Comic Sans MS, sans-serif" size="2"> I recall this discussion before and I've given thought to this method. </font></div>
<div><font color="#000080" face="Comic Sans MS, sans-serif"> Considering</font><font color="#000080" face="Comic Sans MS, sans-serif" size="2"> that it does appear that the hammers/shanks on ancient Steinways & others seem to over center a bit, perhaps your method is what they were using. SInce the hammers bored your way hit the strings at 90 to the string plane instead of the keybed, these actions under that scenario only appear to be over centering . If we are taking the string height minus the center pin height they're percieved to be correct with the keybed but to the string plane...undercentering .</font></div>
<div><font color="#000080" face="Comic Sans MS, sans-serif" size="2"> Since there is often a certain amount upward string slope towards the rear of the piano the perceived over centering could vary depending on that degree of angle. Boring hammers your way may allow for a straight or straighter strike line.</font></div>
<div><font color="#000080" face="Comic Sans MS, sans-serif" size="2"> Hmmm is that straight?</font></div>
<div><font color="#000080" face="Comic Sans MS, sans-serif" size="2">I'll experiment on the next N.Y. Stwy and see how it turn out. Ed do you hang curved strike lines even with this method?<br>
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<div style="color: navy; font-family: 'Comic Sans MS', sans-serif; font-size: 10pt; clear: both;"><font size="1" color="royalblue"><b><font face="Georgia, Times New Roman, Times, Serif"><font color="black"><font color="mediumblue" face="Comic Sans MS, sans-serif">Dale Erwin R.P.T.<br>
<font color="green">Erwin's Piano Restoration Inc.</font><br>
</font></font></font></b></font><font color="darkgreen"><span style="font-style: italic;"><b><font size="1"><font size="1" color="black"><font color="blueviolet"><font color="black"> <font color="black" face="Comic Sans MS, sans-serif">Mason & Hamlin</font><font face="Comic Sans MS, sans-serif">/Steinway/</font><font color="black" face="Comic Sans MS, sans-serif">U.S. pianos</font><font face="Comic Sans MS, sans-serif"><br>
</font></font></font></font><font size="1" color="cornflowerblue" face="Comic Sans MS, sans-serif">www.Erwinspiano.com</font><font size="1"><br>
</font><font size="1" color="crimson" face="Comic Sans MS, sans-serif">Phone: 209-577-8397</font><br>
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<div style="color: black; font-family: arial, helvetica; font-size: 10pt;">-----Original Message-----<br>
From: Ed Foote <a440a@aol.com><br>
To: caut <caut@ptg.org><br>
Sent: Wed, Dec 26, 2012 8:32 am<br>
Subject: Re: [CAUT] S&S M Strike point<br>
<br>
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Greetings,
I'm with Dale on this one. I always bore my hammers to any given
piano so that they strike the strings at 90 degrees. Certain Bechsteins
are the exception...
I ascertain the length of bore by using pre mounted, wooden
"hammers" (which are simply short lengths of the Renner slats used to
ship their parts which are glued on spare Steinway shanks), which I
know are glued on at 90 degrees to the shank. These trial dummies are
of different lengths, and the possible deviation of parallel between
the keyed and the string plane is automatically taken into account.
When the correct length is against the string, I can see the 90 degrees
by using a square laid on the strings and extending down alongside the
dummy "hammer", which has its centerline clearly marked. This dummy
also tells me how much clearance there is between the shank and the
rest felt when the proper blow is set. They also tell me if I am
heading into trouble inre the positions of the let-off button and drop
screw.
The departure from a straight strike line that is usual on larger
Steinways is greater than can usually be accommodated by keeping a
straight hammer line and allowing the over centering that will occur in
these sections to shorten the strike line.
Also, I think it is a mistake to hang hammers using the jigs on
which the back shoulder of the hammer and the tail are used to align
them. The non-even taper of hammer sets will cause the hammers between
the end indexing hammers to lean to far distal in that method. This is
usually only a consideration between C5 and around C7.
Regards,
Ed Foote RPT
<a href="http://www.piano-tuners.org/edfoote/well_tempered_piano.html" target="_blank">http://www.piano-tuners.org/edfoote/well_tempered_piano.html</a>
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