 Topic: Bass Flute - Setting head joint cork
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admin
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| Posted: October.03.05 at 3:40pm | IP Logged
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What's the formula for setting a head joint cork on a bass flute? I'm
hoping it's NOT the same as a regular flute 'cause it's not holding out
for that....not enough threaded rod. 
Michelle
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sharonmarrell
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| Posted: October.04.05 at 3:16pm | IP Logged
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Apparently the
formula is the same for all the flutes. The diameter of the tubing at
the blow hole center is equal to the distance from the center of the
blowhole to where the cork is placed. I get 17mm for C flute; 22mm,
alto; 8mm, Piccolo. I didn''t have a bass handy but I'm guessing 27mm.
hope that helped.
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admin
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| Posted: October.04.05 at 3:26pm | IP Logged
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Hi Sharon,
I ended up calling Harold at J.L. Smith & Co.
and David Straubinger. David didn't have a measurement but told me
about finding the "sweet spot", especially on middle G. Harold gave me
the measurement of 29mm.
Surprisingly, David's explanation was
more helpful in this instance. On this particular bass flute, the
threaded rod holding the cork wasn't even close to being long enough
for the crown to screw onto at 29mm. The "sweet spot" ended up being
about 3/8" left of the 29mm. Once I started moving the cork more than
an 1/8" away from the spot I lost the lower register and the G wanted
to jump up to higher overtones. And while the flute wasn't overly in
tune with itself at any placement of the cork, this was the most in
tune.
Just one more reason I say that we as repair techs need to
be proficient on the instruments we repair. Sounds like I need to write
a blog entry on the subject. Hmmm....
Thanks again Sharon,
Michelle
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SallyGeisert
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| Posted: October.13.05 at 6:15am | IP Logged
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Michelle-
Can you explain the "sweet spot"? Does this work on all flutes and piccolos?
Thanks,
Sally
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admin
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| Posted: October.13.05 at 11:01am | IP Logged
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Hi Sally,
First, I am an ok flute player... with college level
chops. Finding the "sweet" spot on THIS flute was nothing more than
finding where all the notes in all the octaves played. When the head
cork was placed outside of a small range, I lost the lower octave and
certain notes couldn't be tonged. The same thing happens on saxophones
when the mouthpiece is way out of tuning range.
I assume regular flutes react the same way but haven't tested it because I know where the ball-park spot is.
David's
description of the sweet spot was when the flute is comparatively full
and sings in relation to other settings of the cork and is usually most
noticeable on the G right above the staff. I haven't messed around with
regular flutes or piccs since talking to him to know if I'm an
accomplished enough player to notice this.
Will post back once I get a chance to mess with it.
Thanks,
Michelle
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