[pianotech] accuracy of human touch; was hammer mating to strings

[tnrwim at aol.com]

<<Your finger can't match what the gauge does.>>
Yet we take pride, when setting key dip, or when sightless 
echnicians level keys, in being able to feel the difference of 
 tissue punching.
   --David Nereson, RPT

Dave

There is truth in what you say. However, there is a difference between feeling keydip, or even key level, and feeling three strings to see if they are all in line. On key dip, there are many other factors in the regulation process that determine whether 3/8" is dead on accurate, or if we need to add or remove a tissue punchings. The same for key level. On that, if the key isn't exactly level with the one next to it, compensation is made, in the key dip, for instance. 

But on string level, although we can get away with a minute difference between the three strings, and it probably won't make a lot of difference in the final tone of that particular hammer, up until a few years ago, there really wasn't an accurate method of making sure the strings were perfectly level. But now that we do have a bubble gauge, why not use it?  

Wim 






-----Original Message-----
From: David Nereson <da88ve at gmail.com>
To: pianotech <pianotech at ptg.org>
Sent: Thu, Mar 3, 2011 8:58 pm
Subject: [pianotech] accuracy of human touch; was hammer mating to strings



---- Original Message ----- 
rom: <tnrwim at aol.com>
o: <pianotech at ptg.org>
ent: Thursday, March 03, 2011 1:40 PM
ubject: Re: [pianotech] problem in mating hammers to strings
I feel to see if all the strings are in the same plane.  I
n't like the idea of the bubble level because if the floor
n't perfectly level and the plate isn't perfectly level, or if
e holes in the agraffe aren't perfectly level, you're getting
false indication.
>>David
Before leveling the strings with the bubble gauge, put it on the 
late. If you see the bubble is to one side or another, then 
atch that to the strings. But in all the pianos I've done this 
ay,  I've only had one or two show that the plate, and/or 
iano, was not level. Your finger can't match what the gauge 
oes. The gauge will tell you instantly which of the three 
trings is high or low. In most cases, it is the aggraff that's 
t fault.
 --Wim  >>
<<Your finger can't match what the gauge does.>>
Yet we take pride, when setting key dip, or when sightless 
echnicians level keys, in being able to feel the difference of 
 tissue punching.
   --David Nereson, RPT


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