[pianotech] An alternative to cutting the balance rail punching; was best way to change touch on Yamaha grand

[David Love]

I was thinking about this procedure and it occurred to me that you could
simply rout out a shallow "u" shape right in front of the balance rail hole
on the bottom of the key.  In my case I use very thin balance rail punchings
(those red hitch pin punchings because I don't like to have to deal with
balance rail punching compression and the thinner red punching is less prone
to compression) so cutting those runs the risk of the key rocking onto the
supporting card punching underneath.   Seems like routing out a small
channel in front of the balance rail hole (you could even do it with a
rounded file) would accomplish the same thing since the idea is simply to
avoid key contact with the punching as the key rotates forward.  For that
matter, doing that in manufacturing would somewhat obviate the need for the
balance rail bearing.  

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Al Guecia/AlliedPianoCraft
Sent: Thursday, February 11, 2010 6:07 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Al in N.C.--Question on procedure was- Best way to
change touch in Yamaha grand

 

Julia, yes the key is upside down with the back-check in front of you and
the covered key away from you. I square up the front of the key and I cut
down toward the front of the key.

 

If that's not clear, let me know and I will cut one and take a photo. I
don't know how to add a drawing.

 

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