Author: huboboe
Date: 2011-04-05 23:36
Jonathan: A response to Cooper, but aimed at the BB. I'm trying to see what kind, if any, of a consensus exists among those who double radius gouge.
I expected that answer, since Cooper had described the process as asymmetrical, BUT, if the gouger were set up with the blade and guides symmetrical at the same diameter (like a single radius gouge only smaller), then you could cut to completion, since the guides would not impede the carriage travel. You probably wouldn't want to, though...
It sounds like this has not been tried, but the question now becomes: how important is it that the blade profile presented to the cane be elliptical and not circular? It seems to me that unless the grind angle were quite a lot shallower than the 45ยบ that provides a circular profile, the amount of ellipticality would be very small and MIGHT not matter. Cooper's Principal of the ideal blade angle/diameter combo suggests that it does matter, but this is subject to actual test...
I don't see any good way to profile elliptical guides short of having an infinite assortment of dedicated form cutters (hand filing does not cut it in my book) so I see myself as confined to circular guides.
I had hoped someone might say, 'Hey, Bob, try a 9.5 blade, offset 1.5 mm on 11mm cane.' or something of the sort, but I guess I'm gonna have to just try a variety.
And a standard disclaimer, just so no one thinks I forgot: Cane is a Natural Substance and not Uniform, so there really are no hard numbers, just close approximations.
Robert Hubbard
WestwindDoubleReed.com
1-888-579-6020
bob@westwinddoublereed.com
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