even balance weight or something

[Phillip Ford]

These numbers sound reasonable to me.  But I wonder if the some standards 
for inertia also need to be specified?

Phil F

At 06:41 PM 4/28/03 , you wrote:


>  I'll stick my neck out and say that you could easily establish a
standard.
>If you could poll all pianists about their likes and dislikes, have them
>sit down to a row of mute pianos and just feel the actions, my bet is
that
>there would be a fairly normal bell shaped curve with a standard
deviation
>that would bring 95%of the players within a fairly narrow range of
balance
>weight and regulation specs.  Some of the outliers might actually be
>personal preference, some might be misperception.  Tastes may also have
>something to do with what people are used to.  Once you've learned to get
>what you need out of that 1970's B with more lead than wood in the keys,
it
>feels normal to you. Over the past couple of years,  I have defaulted
>almost everything to a narrow range of 34 - 42 balance weight with front
>weight maximums in the 85 - 90% range depending on requests of lighter
>versus heavier and the particular set of hammers.  Regulation specs have
>always taken priority and I have not deviated far from 10 mm dip
delivered
>by a SBR of 5.6 - 5.8.  If I had to choose a standard it would be smack
in
>the middle:  38 balance weight, 5.7 SBR which produces a regulation of 10
>mm dip, front weights below maximums by 10 -15%, and whatever the SW zone
>that both fits into all that and is realistically acheivable with the set
>of hammers you have.   Setting the action up with an adjustable rep
spring
>to get you that entire range quickly (if you wanted to) would mean that
the
>rep spring would need to displace an average of 8 grams of FW (lower is
>better in my opinion).  With a midrange default of 38 BW, to get to 34 BW
>you would then have to go up to 12 grams for the rep spring, and for 42
>down to 4 grams leaving you a comfortable margin of error.  My guess is
>that you would have very few complaints
>
>  David Love
>  davidlovepianos@earthlink.net

>