 The Clarinet BBoard
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Author: Bill
Date: 2005-11-19 16:56
First, yes, I have read the archives, particularly the comments of John Butler, Walter Grabner, GBK, and others. Second, I've just started doing this kind of measuring for myself, and I know absolutely nothing.
Today I measured the barrels and top joints of several clarinets using a Ferree product they call a "clarinet bore measuring tool." Just having some fun here on a Saturday. Very humble investigations, here.
The variation between the "measurement" (machinists/engineers, please note that I use quotations) of the exit bore of the barrel and the entrance bore of the top joint seems substantial for some of my clarinets. On one, the barrel bore ends substantially narrower than the top of the UJ. On another, the reverse is true. Other clarinets and barrels matched up well (R-13).
Of course, the barrels might not be original, but in one case (an old Leblanc "Symphonie") I am willing to bet it's the original barrel. For the Leblanc, the barrel bore measured over twice the size of the UJ. Also, the *exit* bore of the top joint measured slightly larger than the top. Both ends have metal tenon caps.
Is it reasonable to say that for the majority of clarinet designs, the bore at the barrel exit and at the top joint entrance should be close in meaurement? Or not?
Lee Giibson's book wasn't much help.
Bill.
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Author: Don Berger
Date: 2005-11-19 18:13
Like you, Bill, I've never seen/read much, if any, discussion re: bore-matching at the joints, mp/barrel, barrel/ U J, U J/L J, L J/bell. I just cant see any value to be derived by ?intentional? mis-matches, so I strive for at least the higher 3 junctions' matching, but am open to any/all info. Help?, Don
Thanx, Mark, Don
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Author: sfalexi
Date: 2005-11-19 18:19
For any barrel makers that might come upon this, I'd be very interested in whether they take the pains to match the exit/entrance bore to the specific mouthpiece and clarinet of the purchaser, or perhaps their experiences with creating/alleviating resistance, volume, or any other things through manipulation of bore size. Or even if they feel that differences are negligable and therefore use a certain 'template' for most/every barrel they make.
Alexi
US Army Japan Band
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Author: Alseg
Date: 2005-11-19 23:18
Yes.
I always ask what mouthpiece is used (as well as the clarinet...of course).
Top joints are often wider than the bottom of the barrel bore.
This is a variation on the theme of "polycylindrical"
Almost all taper barrels end narrower than the bore of the receiving joint.
More importantly, there should be NO gap between the tenon of the mouthpiece and the barrel. This can mean that sometimes the shoulder of the mouthpiece does not fully abutt the barrel....forgiveable.
Walt....any thoughts on this?
Former creator of CUSTOM CLARINET TUNING BARRELS by DR. ALLAN SEGAL
-Where the Sound Matters Most(tm)-
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Author: Bill
Date: 2005-11-20 00:15
I confess I wish I had not purchased my "clarinet bore measuring tool." I have before me Selmer L296, M8446, and N5922. Measuring the top joint *exit* bore of each, I obtain 17.25 mm (L), 24 mm (M), and 31 mm (N). These numbers relate to the tool I am using and have no meaning in a standard way (in my case, the length of graduated probe is measured after insertion).
So my early (three-digit) "L" measures more like a "K" series (narrower).
Oy vey!
Bill.
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Author: Katrina
Date: 2005-11-20 14:20
Alseq has mentioned something that made me question the whole thing...
What about pulling out joints in order to tune? Doesn't that change the same places' measurements? Doesn't the extra gap change the bore anyway??
Katrina
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Author: tictactux ★2017
Date: 2005-11-20 14:28
> What about pulling out joints in order to tune?
To my understanding, by pulling the joints out, you get a polycylindrical bore for free.
--
Ben
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