37 steps---delayed response

[David Ilvedson]

Yamaha's video of the 37 steps is unrivaled source for learning what is going on in a grand action.  Granted, they are working from a very well engineered piano.  



David Ilvedson, RPT

Pacifica, CA 94044









Original message

From: "Larry Trischetta" 

To: "Pianotech List" 

Received: 2/4/2008 9:08:06 PM

Subject: RE: 37 steps---delayed response







>>DO THE SPRING STRENGTH FIRST, AND PRECISELY 



The spring tension will change to some degree (sometimes a lot) when the other regulation points are done, therefore it is impossible to adjust the strength precisely on the FIRST pass. Most of the regulation points except let-off will change, even if it is a small amount, after other points are tackled. Thus the “rounds of regulation”. But it is true that the spring tension should be either after blow distance or not far behind. Let off can come before spring tension. The 37 steps are just that
 steps
 but not the process as a whole. You will be going up a few steps and  then back down a few more and so on
 you’ll be running up and down the staircase a number of times, until every point is in harmony with what the technician KNOWS is supposed to happen. Without that knowledge of what is supposed to happen, all you’re doing is following steps in sequence and crossing your fingers at the end of the last step. The concept of what is actually happening when you change a point of regulation is imperative. 

Larry Trischetta 















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