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MMD > Archives > January 2012 > 2012.01.17 > 10Prev  Next


Testing a Key Striking Pneumatic
By Eliyahu Shahar

Just one note about testing -- you want to test the pneumatics very
well before installing anything.  I once used a cloth that didn't
adhere well to the pneumatics.  I forget which type, but it was
recommended as it's extra light.  They said to glue the cloth backward.

Anyway, the cloth failed me after a short while though I tested the
pneumatics very well.  I took it apart and tried a few pneumatics and
found the bond to the cloth very weak.  I then tried a new test:
instead of testing them by suction on the pieces, I tried by blowing
them.  Several failed, several passed.  Those that failed I cleaned the
cloth with rubbing alcohol and glued the cloth back in place -- then
they all passed both suction and pressure.

That piano is still functioning and even survived the Haifa fire (in
the NISCO museum).  From this point on, I always test with both suction
and pressure all pneumatics.  I also never tried to see if they would
close on their own weight, but no binding and easy movement is crucial.

Eli Shahar
Sonora, Calif.


(Message sent Tue 17 Jan 2012, 18:41:02 GMT, from time zone GMT+0200.)

Key Words in Subject:  Key, Pneumatic, Striking, Testing

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