Piano Mystery

[Warren Fisher]

Patrick,

I think that if you put bolster felt under the wippen leather and reset
the lost motion afterward, I think you will find that the let off has
returned to near where it should be.  There is a dent where the jack
hits all the time and that causes early let off after the capstans have
been raised to remove lost motion.  

This is a guess.  Has anyone tested it out?

Warren


Bonifield/Poulson wrote:
> 
> List Members All: All right, I've got one for you.  Why is it that on
> some uprights the let-off distance increases as the action gets more and
> more out of regulation?  I have observed this phenomenon many times when
> first being called to service a piano. Intuitively it would seem that as
> the let-off puncning wears it gets thinner and allow the jack to trip
> out with the hammer closer and closer to the strings.  This I have seen
> (blocking hammers) but I have also seen pianos with let-off distances at
> 1/4 " and more, and the owner swears that the instrument has never been
> regulated in recent memory.  Is it possible that on all these pianos a
> previous technician somewhere in the forgotten past has gone through and
> adjusted let-off wider for some reason?  Or am I a victim of
> tuning-induced delusions?  Patrick Poulson, RPT

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Warren D. Fisher
fish@communique.net
Registered Piano Technician
Piano Technicians Guild
New Orleans Chapter 701