bobble heads rule(r)

[Wolfley, Eric (WOLFLEEL)]

Wim,

In addition to all the excellent advice you've been getting, when regulating
it's important to make sure the key-dip is the same on the bench as it is in
the piano. You can achieve this by shimming the appropriate places under the
keyframe. This might explain why checking is good on the bench but not in
the piano. In situations where the performance is marginal or erratic a
slight difference in key travel can cause failure. 

~~~~~~~~~~~~~~~~~~~
Eric Wolfley
Head Piano Technician
Cincinnati College-Conservatory of Music
University of Cincinnati
~~~~~~~~~~~~~~~~~~~

 -----Original Message-----
From: 	MarySmith@mail.utexas.edu [mailto:MarySmith@mail.utexas.edu] 
Sent:	Thursday, October 17, 2002 9:37 AM
To:	College and University Technicians
Subject:	Re: bobble heads rule(r)


>When you test on the bench do you use a string height gauge and play a
>pianissimo key strike?
>
>Ed

Ed asks an important question here. If you don't use a string height gauge,
the hammers, when played, will go up further than they do in the piano, and
have more momentum coming back down into the backcheck. Thus, they will
check better on the bench. I do experience this problem ALL THE TIME on the
practice room L's and M's I maintain. I find that a combination of
1)ensuring that the backchecks are high enough (i.e., top of backcheck is
1/16" below bottom of tail at let-off), 2)roughing tails lightly with 60
grit paper, 3)slightly lower drop, and 4)slightly less spring tension will
accomplish checking in even the most recalcitrant pianos. Good luck.

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