It's interesting that you mention the Steinway balance bearing, Jon. I was speaking with another tech about a piano that could have benefited from the half-punching, but it was a Steinway with balance bearings... Anyway, he said that some techs lift the cloth on the bearing and slice a portion of the wood off at the balance hole (making it more of an angle) and then put the cloth back in place. Hmm, I wish I had known that when I was working on a particular concert instrument some years ago. Barbara Richmond, RPT near Peoria, Illinois ----- Original Message ----- From: "Jon Page" <jonpage at comcast.net> To: pianotech at ptg.org Sent: Thursday, January 7, 2010 5:27:50 PM GMT -06:00 US/Canada Central Subject: Re: [pianotech] Best way to change touch on Yamaha Grand Re: [pianotech] Best way to change touch on Yamaha Grand What you're actually doing is changing the action ratio by moving the fulcrum Installing a half punching under the key has more effect of maintaining the position of the fulcrum. As the key is depressed on a normal punching, the fulcrum migrates forwards as the key rocks on the punching. Trimming the punching removes the front portion thus not allowing the fulcrum to travel too much forwards of the pin. This is the benefit of S&S Balance Rail Bearings, (as difficult as they are to level keys). -- Regards, Jon Page -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100108/def470dd/attachment.htm>
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