The channel only needs to be a couple of mms deep and need not contact the hole itself. It can start a mm or so in front of the hole and if it's U shaped (as it would be if you just used a rounded file to make it) it won't weaken the hole or the beam. David Love www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of David Skolnik Sent: Thursday, February 11, 2010 6:56 AM To: pianotech at ptg.org Subject: Re: [pianotech] An alternative to cutting the balance rail punching; was best way to change touch on Yamaha grand David - I'm not seeing how you could accomplish this without weakening the wood in front of the balance hole. David Skolnik Hastings on Hudson, NY At 09:27 AM 2/11/2010, you wrote: >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. >
This PTG archive page provided courtesy of Moy Piano Service, LLC