Hello Mark,
The so called ( D spring ) is applied to more than one action.
M. Schultz used one built by The Thayer Action Co Of Chicago.
another is W. P. Haines.
So I would think the best thing to do is pictures--pictures.
Both of the above mentioned actions ( models ) are on display
in the PTGF. Museum at the Home Office in K.C.
Generally speaking,,, if a Grand action has no repetition lever
adjust it as you would an upright. ie. hammer shank resting on
the hammer rail felt. And lubricate well.
I wish you success,,, and hope this helps. Let us know.
Regards
Jack Wyatt
In a message dated 11/8/2010 11:35:38 A.M. Central Standard Time,
pianofortetechnology at saol.com writes:
Dear List
I have learnt to regulate grand pianos from reading and applying what I
have read from Danny Boones book on grand regulation and the PACE book
written by Bill Spurlock.
I am now faced with a D type spring and loop grand that I have to
regulate. I have some idea of how to go about it but am unsure about a few things.
Will someone please help me out and answer some of my questions? 1.
Should the hammers rest on the hammer rebound rail or not? 2. If the hammers
are supposed to rest on the rail, then what is the best way of adjusting the
capstans so that there is no lost motion? 3. Should there be aftertouch on
this type of action? 4. When playing the key slowly and letting the
hammer let off, how much should the hammer drop by or should it drop at all? 5.
On a normal blow, once the hammer is in the checked position, once one
releases the key slowly, should the hammer rise, be held in the same position
or drop a certain amount?
Your assistance will be much appreciated.
Mark Davis
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