Is it possible the glides were turned down farther than normal to increase dip? David I. ----- Original message ----------------------------------------> From: Richard Brekne <Richard.Brekne@grieg.uib.no> To: Pianotech <pianotech@ptg.org> Received: Sun, 05 Sep 2004 23:09:36 +0100 Subject: Re: An odd situation >You know Dale... seeings how this is a Yamaha... I didnt stop to think >to check a few of the things you mention below. But you did hit on >something I didnt mention... tho I didnt measure it, I did get the >impression this was a bit heavier then usual Yamaha. Couldnt be >centerpin friction tho... as these are newly protek't and nice and >free... too free for my likeing.. grin.. but thats another story. >I'll look at some of these basic <<Stanwood>> parameters next time I go >down in a couple weeks... off list Jon Page also suggested I double >check to see if anyone has dinked around with shimming the stack. >46 mm blow is the figure we were given at the Acadamy. 47 was said to >be like.... ok if you wanted to get less aftertouch... 48 was supposed >to be no no... >But what suprised me was that I couldnt adjust to 50 mm... not that I >should want to... but there is supposed to be around 5 mm between the >shank and rest cushion. >Cheers and thanks for the thoughts >RicB >Erwinspiano@aol.com wrote: >> In a message dated 9/5/2004 1:33:55 PM Pacific Standard Time, >> Richard.Brekne@grieg.uib.no writes: >> Ric >> Good analysis. The short answer is your leverage is too good. >> Now I thought 48 mmm was standard spec for blow on most of Yamaha >> grands. I would set letoff closer as you did to consume some >> dip/aftertouch. >> Beyond this I suspect capstan placement could be too far back or >> perhaps a slight adjustment of the action spread would change the >> action key ratio enough to bring it back into tolerance. This is >> fairly unusual for Yamaha. With all their jigs & fixtures to assure >> uniformity action to action. This is odd. >> I don't like actions set up this way as the overall touch weight >> usual ends up heavy as is the typical problem with Baldwin. >> Are the knuckles perhaps to close to the center pin? This would also >> contribute to the problem. It could be one or more contributing >> factors but with Yamaha a compounding series of errors would be >> likely, Don't you think? >> Dale >> >> So... in the end.. I had 48+ mm blow, standard Yamaha spec letoff and >> drop, 10 mm dip, 64 mm key height and too much aftertouch with no >> real >> way of getting less. Ok.. I could have fudged a bit on let off... >> but a >> few tests didnt really get me where I wanted... I would have had >> to go >> with about 2 mm in the bass... 1 mm in the treble, and a 9.5 key >> dip to >> get the aftertouch down to where I usually like it... which is by no >> means too little. >> >> Anyone got an idea as to what could be wrong here ?? >> >> Cheer >> RicB >> >> >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives
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