An odd situation

[David Ilvedson]

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
>>
>>  


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