Grand touch

[David Ilvedson]

That's a good point about the backchecks...test with your hand putting a little force downwards on the hammer while you play the key.  If you feel the backcheck rubbing the tail you need to regulate your backchecks...checking too high...

David Ilvedson, RPT
Pacifica, California



----- Original message ----------------------------------------
From: "V T" <pianovt at yahoo.com>
To: pianotech at ptg.org
Received: 7/13/2006 4:28:15 AM
Subject: Grand touch



>Hi Ric,

>Back to the problem on hand...

>- Since the balance weight and friction seem fine, I
>will assume that the action doesn't feel heavy when
>you play a slow, quiet piece.  Is that correct?  Can
>you confirm?

>- Since the BW is in spec, helper springs are not part
>of the design, unless someone modified the action and
>added lead.  Any evidence?

>- I mentioned this before, but will ask again: if
>there is marginal clearance between the back check and
>the hammer tail, there could be some contact on the
>way up when you play really fast or loud.  This
>happens because of the flex in action parts when you
>apply force.  You will not notice the problem when you
>move the hammer slowly.

>- Could the action centers be too tight?  I am sure
>you would have noticed that.

>- Take a few sample hammers off and measaure the
>strike weight.  Here is the reason I say that:  with
>the nice 5.5 ratio, good BW, and no excessive lead, it
>would seem that the strike weight must be fine, but
>some (European) manufacturers hide addittional lead
>under the key tops.  This is lead they know for sure
>will be needed, so it goes in automatically during
>production.  The rest is visible and amounts to
>adjustment lead.

>Vladan

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