Author: RobinDesHautbois
Date: 2011-04-02 11:48
Now, my machine is definitely not a "successful" double-radius machine, but the blade does not necessarily have to bee of irregular shape to get it.
I can only speak in engineering terms of vector mechanics here, but you can see the principles of double-radius are shown half-way down my blog post:
http://robindeshautbois.blogspot.com/2011/03/gouging-oboe-cane-part-1.html
=> any irregularity in the curve will mostly serve to achieve your personal preferences.
The guide (plane bottom--- in my blog I use the word for the roller stop-bar) CAN be used to press the cane against the bed, but I'm not convinced that is so necessary. In terms of vector mechanics (force distribution) it doesn't matter if parts of the blade stick out more (compared to the guide) than others, as long as there is symmetry from side to side. Thus, the blade can have an oblong shape whereas the guide can be a perfect cylindre and no harm will be done. Without that symmetry, the call will be yanked to the side where the blade extrudes the most.
Now, Robert, Jonathan, Cooper, Craig and others, you have a truckload more experience than I do, and so you can formulate a better design on what is preferable in such conditions and for such type of reed preference.
Robert:
the "grind angle" do you mean the angle of the bevel relative to the flat top of the blade? If so, the bigger, the more solid, but the smaller, the easier the cut. Smaller means easier, but also less stable..... its with a rather small bevel angle that I manage to change my blade shape: I manually add a 2nd bevel.
Robin Tropper
M.A.Sc., B.Mus., B.Ed.
http://RobinDesHautbois.blogspot.ca/music
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The Oboe BBoard
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