 The Clarinet BBoard
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Author: Clarineteer
Date: 2016-05-12 16:51
What exactly is a Poly cylindrical bore and wat do they mean when they say the clarinet has a Poly cylindrical bore.
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Author: Tobin
Date: 2016-05-12 17:03
Once upon a time, the bore was the same diameter throughout the majority of the tube's length. One cylinder.
The R13, in the mid '50's, changed that. The bore has different diameters that change gradually = poly-cylindrical.
James
Gnothi Seauton
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Author: derf5585
Date: 2016-05-12 17:51
Why called poly?
Is this a boring subject?
fsbsde@yahoo.com
Post Edited (2016-05-12 17:52)
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Author: Chris P
Date: 2016-05-12 19:07
Polycylindrical bores are made up of several different diameter cylindrical sections as opposed to a completely cylindrical or (reverse) tapered/conical bore.
The difference between each section of the bore is in fractions of a millimetre, so not easy to see by eye, but you can just about see the steps in the top joint in Buffet bores if you look down them from the top end.
I think there are three different width sections - the widest section is from the tenon to near the speaker tube and the next widest section is from there to above the throat A tonehole. The measurement of the bore is taken from the mid tenon (at its narrowest).
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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Author: kdk
Date: 2016-05-12 19:31
Chris, 've never been sure - are the steps abrupt (small as the changes are) or are they tapered into each other?
Karl
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Author: Chris P
Date: 2016-05-12 19:57
They look more abrupt in Greenline bores compared to grenadilla bodied clarinets - maybe the steps have been softened by being papered up after reaming.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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Author: Caroline Smale
Date: 2016-05-12 23:26
From appearances I would say that the different reamers used to create a polycylindrical bore have a small radius on the leading edge. It clearly makes sense as an abrupt step is the last thing you want.
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Author: Chris P
Date: 2016-05-12 23:35
By abrupt I meant distinct, but not mega sharp-edged.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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