Hi, comment below:
Referent to:
http://ptg.org/pipermail/pianotech_ptg.org/2009-February/004656.html
by David Love
I agree entirely with this approach, tho slightly different in actual
method. Essential to this is as David points out a perfectly regulated
action. The basic relationships between blow distance, let off, and key
dip along with the unavoidable small variances in action parts dictate
that if an even after touch is to be acquired then one of the three will
have to float to some small degree. Of these three it is my experience
that key dip is the obvious choice. First and foremost because no matter
what gauge you use to set key dip... no matter how you go about it...
you will never ever get it truly <<perfect>>. Any given other
technician will be able to find this and that here and there to
re-adjust, and pianists simply do not react to the variances in key dip
required for a dead even after touch given an otherwise perfectly
regulated action. Quite the opposite really... they WILL react to after
touch unevenness.
As David points out... after touch is the most important aspect of
setting key dip. I'd add that all other things being done well, any
unevenness in resultant key dip will be at least as insignificant as the
most precise attempt at setting dip to exactly 10.0001 mm (or whatever
your gauge is).
I start with a rough 10 mm dip... go about as good a regulation as I
can, then circle back to key dip for after touch, finishing with a
refinement of drop as that can change with changes in key dip.
Cheers
RicB
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