[pianotech] new Faulk lever--compare with Fujan?

John Formsma formsma at gmail.com
Wed Mar 25 12:55:58 PDT 2009


I'd posted this a few days ago, but maybe it got buried in Inboxes. I'm
particularly interested in those who've used the Fujan CF lever, and their
comparisons to the new Faulk lever.  Also, engineers-turned-piano techs who
contribute to the list -- any input on my questions below about
deflection/flex?

-- 
JF

*************
Posted 3/22/09
David [Andersen], you've used the Fujan, right?  How does the new Faulk
compare?

I'm not seeing how it could be stiffer than a hollow CF tube the diameter of
a Fujan (or Gluzman). Rigidity comes from the large diameter of the hollow
cylinder -- not from the fact that it's merely a CF rod. The smaller the CF
rod or tube, the more flex it will have.

In other words, even if you do put a 1/2" CF rod in a 5/8" hollow aluminum
tube -- it still isn't as stiff as a Fujan.  Unless there is some
(unknown-to-me) coupling effect from the two used together. And unless it's
made quite a bit shorter.  If it's shorter, there won't be as
much noticeable flex. But then, you'd get that same effect in greater
proportion with the larger diameter CF tube if you used a shorter piece
there.

I'm haven't seen a new Faulk lever yet. Nor do I know the actual dimensions
of the materials used.  (I'm not an engineer, but I've played around with
some numbers some time ago.)  I know it's all about how it feels; numbers
don't tell everything, but they do help.

I await enlightenment. <G>

-- 
JF
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