Touch Weight

[David Love]

Familiarizing yourself with Touch Weight Metrology will help because there
are things to consider in the adding or subtracting of lead, like how much
lead is in there to start with.  Check the PTJ or the list archives as
there are several articles and discussions available.   But in the
meantime, adjust the weight so that (UW + DW)/2 is equal for each note. 
The relationship between UW and DW will vary as a function of friction from
the bottom to the top of the keyboard.  That number (referred to as the
Balance Weight (BW)) should range from 36 - 42 for most normal actions. 
Your UW 52 DW 30  (BW of 41) puts the action on the slightly heavy side,
but not uncomfortably so.  I usually aim for  BW of 38-39 grams for a
medium weight action.  A BW of 40 - 42 would be appropriate for someone who
wants it a bit on the heavier side.  

David Love
davidlovepianos@earthlink.net


> "Paul Chick (EarthLink)" wrote:
>
> > Members
> > A client asked me to "redo" the action in a Mason & Hamlin A.  It was
worked
> > on when the piano was restrung but nothing was replaced.  The client
wants a
> > heavier touch. With the old parts it weighs off at 41grams down and 20
grams
> > up on average from A0-C8.  New Renner wips, shanks with flanges, and
hammers
> > bring it up to 46grams down and 25 grams up on sample keys. Removing
the key
> > lead closest to the balance rail brings it up to 52 grams down 30 grams
up
> > with a little less in the last 1&1/2 octaves on sample notes.