Hammer Tail Cove and SW

[Isaac OLEG]

Sarah hello,

Your hammers look very even .45 g is eventually how much felt you get
when shaping the head.

I liked the idea to even the progression at the break, till I thought
that , may be the weight of the last plain wire is also showing a gap
vs. the first wound strings.

Does someone experiment that idea ? I recall taking some lead (solder)
off at the break on a Steinway D, for some reason, I had the
impression the added weight was not better at that place, but I did
not thought of the strings weight at this moment.

A piece of solder can give you 0.6 g, but lead is heavier.
Shaving the sides (on a disk sander) of a too large hammer is OK
(assuming the thickness is the problem) but sanding the felt is
producing a lot of heat , it is a delicate operation (the felt harden
and get bad looking if too hot) shaving the wood on the sides does not
give you much weight , but is safer.

Others have done that process more often than me, I let them chime in.

Be well.

Isaac OLEG


-----Message d'origine-----
De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la
part de Sarah Fox
Envoyé : dimanche 22 août 2004 00:19
À : Pianotech
Objet : Re: Hammer Tail Cove and SW


Hi Ric, Jon, whomever,

A related question for you, sort of...

I'm about to start evening out the SW on a new set of hammers  (nice
ones!
:-)  I've measured out all the starting strike weights on a centigram
balance and entered them in an excel spreadsheet.  The curve is pretty
linear.  I only need to adjust out the jags.  I did a linear
regression
analysis to find the best fit to the line.  I need to remove as much
as .45g
and add as much as .60g (mostly just above the bass/tenor break).
What's
the best way to do this?

I presume the jags are mostly from slight irregularities in hammer
width, so
is the best way to remove weight to thin the hammer slightly on the
sides?

Is the best way to add weight to add something like epoxy or lead?  If
lead
is the way to go, is it feasible to press small bits of solid-core
solder
into a drilled hole in the molding?

Any advice would be greatly appreciated.

Thanks!

Peace,
Sarah


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