Yamaha Spring Tension

[piannaman at aol.com]

Jon,

How long does this procedure take you?? I've used Tom's method often, and that goes pretty quickly, but you're adding a few steps.? 

Thanks,


Dave Stahl



-----Original Message-----
From: Jon Page <jonpage at comcast.net>
To: pianotech at ptg.org
Sent: Thu, 28 Jun 2007 8:09 pm
Subject: Yamaha Spring Tension



>40 grams measured at the spring is roughly

>equivalent to 20 grams measured at the flange.




Thanks Frank, that's what I'm getting when I open the spring

so as to have the arms in line at 180 degrees (the resulting

angle is around 130 degrees) and attach to the loop.




I'll enter this info into my Action Handbook in the Yamaha section

along with 44mm cord length which is achieved by wrapping the

cord around a 9/16" dowel and slicing along the length of the dowel.

Glueing cord ends onto the flange 10mm on each side of the yoke.




I remove the hammers/flanges from the rail, number each and separate.

This way I can file the hammers on the oscillating spindle sander and

decide if repinning is in order. Secure the flanges in a vise to clean the

flange grooves and install the new cord. Assemble units, open spring, hook.




I might even opt to taper the hammers slightly. RIght side in the bass,

left side in the tenor and both sides in the treble.




Tom Cole's procedure is here (see photo at end):

https://www.moypiano.com/ptg/pianotech.php/2006-December/198869.html

-- 


Regards,

Jon Page


________________________________________________________________________
AOL now offers free email to everyone.  Find out more about what's free from AOL at AOL.com.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20070629/22a730ef/attachment-0001.html