 The Clarinet BBoard
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Author: Koo Young Chung
Date: 2006-09-20 02:34
This is a technical question for maker/tech
How do you make under cutting? Do you use special tool?
Do you go thru the tone hole or the bore etc..?
Thank you
Post Edited (2006-09-20 02:34)
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Author: Arnoldstang
Date: 2006-09-20 03:04
Fraising tool.....at least historically....( in Baines' History of WW's) cutting tool threaded put in bore ....connects to handle that goes into tone hole and connects to cutting tool.
Freelance woodwind performer
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Author: L. Omar Henderson
Date: 2006-09-20 03:17
(Disclaimer - I am a designer of the Forte' Bb and C clarinets)
There are hand tools of every description but the basic design - although I have not used them - is the cutter inside the bore connected to a handle inserted into the tone hole connecting to the cutter. In the CNC world, in one configuration, there is a round burr on a thin shaft that goes into the tone hole and is pulled up and goes around the circumference of the tone hole and to the sides of the tone hole from below. The shape of the burr and the width determines the angle of the undercutting and the amount of upward movement determines the depth of the undercutting. Different burrs may be used on different tone holes depending on the wishes of the designer and acoustician.
L. Omar Henderson
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Author: Bob Phillips
Date: 2006-09-20 15:19
So, given that there is a practical way to undercut tone holes, how does one know what to do and how much to cut?
What dp some typical undercuts look like? Anyone cut his/er upper joint apart through the tone holes lately?
Bob Phillips
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Author: clarinet_georgio
Date: 2006-09-20 15:27
Undercutting and how to do it 'correctly' is still a mystery to all. All clarinets eventually evolve in their construction, which leads to many types of ways the factory undercuttings are done-shape, depth, etc... Most people assume that undercutting is a way to mend tuning issues, however it should really be done as a last resort if opening tone holes/chimneys proves to be not as effective. If you cut too much, your tone will get really spread and fuzzy-kind of like what throat Bb tends to sound like. Some undercuttings are angled and some are more round, but it really depends on the make and vintage. This is one of those things that would be a good subject for reasearch! There really is no exact answer-you just undercut to your own personal likings-just not too much!
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Author: Arnoldstang
Date: 2006-09-20 15:49
google "fraising tone holes" There is information there including some by Stephan Fox.
Freelance woodwind performer
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Author: BobD
Date: 2006-09-20 16:40
Disclaimer: I am not a pro but just an amateur. I have tried ground down hobby blades but they are not stiff enough. I have tried three sided "scrapers" and they are stiff enough but so-so. I currently use a set of Swiss made deburring tools and they work "OK". Each burr is a circular blade mounted at mid diameter to a handle. The appropriate size one is slightly smaller than the intended key hole, inserted from the top and then skillfully rotated around the bottom of the hole. If you are lucky you succeed. The conventional fraising tool set is expensive to purchase for only occasional use. Fraising is either an exact procedure, a guess or a disaster. It doesn't always produce the result you expected in which case you are faced with an even more touchy procedure. There are stories of even accredited clarinet makers making clarinets with fraised holes that degraded the horns.
Bob Draznik
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Author: Koo Young Chung
Date: 2006-09-20 20:53
I'm doing some research about clarinet now and it involves some
under cutting.That's why I post this topic in the first place.
I'll greatly appreciate if someone tell me where to get one of these hand tools. Exact size doesn't matter for what I'm trying to do.Please contact me off line.
kooyoungchung@gmail.com
Thank you all.
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Author: Mark Charette
Date: 2006-09-20 21:03
Koo Young Chung wrote:
> I'll greatly appreciate if someone tell me where to get one of
> these hand tools.
http://www.ferreestools.com/ has just about every tool ever manufactured for woodwinds and brasswinds. Give them a call or email. They're not that far from you in Chicago, either - out in Battle Creek, MI.
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Author: Gordon (NZ)
Date: 2006-09-22 05:22
Here are more fraising tools from Bohm
http://boehmtoolscom.t3-kundenserver.de/uploads/media/Special_tools_for_clarinet-oboe_01.pdf
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Author: Koo Young Chung
Date: 2006-09-22 05:31
What is the general under cutting angles?
Is it 45 degrees? Or much bigger?(relative to the clar axis line)
Please maker give answers.
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