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

[David Nereson]

----- Original Message ----- 
From: <tnrwim at aol.com>
To: <pianotech at ptg.org>
Sent: Thursday, March 03, 2011 1:40 PM
Subject: Re: [pianotech] problem in mating hammers to strings

I feel to see if all the strings are in the same plane.  I
on't like the idea of the bubble level because if the floor
sn't perfectly level and the plate isn't perfectly level, or if
he 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 
plate. If you see the bubble is to one side or another, then 
match that to the strings. But in all the pianos I've done this 
way,  I've only had one or two show that the plate, and/or 
piano, was not level. Your finger can't match what the gauge 
does. The gauge will tell you instantly which of the three 
strings is high or low. In most cases, it is the aggraff that's 
at fault.
  --Wim  >>

<<Your finger can't match what the gauge does.>>

Yet we take pride, when setting key dip, or when sightless 
technicians level keys, in being able to feel the difference of 
a tissue punching.
    --David Nereson, RPT