John Murphy's thread on the geometry of gouge sharpening has grown long and has meandered into the issue of how to use the the jig after it is set. I would like to throw in another consideration that may draw it out even further. Glenn Lucas, in his DVD on Sharpening Techniques, points out that special problems arise when trying to grind wings on bowl gouges with V or U profiles, and that the parabolic profile is to be preferred when using jig sharpening. The issues that he describes sound a bit like what Grant Wilkinson mentioned. ersonally, I have only parabolic flutes in my arsenal so I am not in a position to experiment. Have others faced this issue?