I made a jig sharpen my roughing gouge, just an adjustable rod coming from under the bench grinder with a little cup for the butt of the tool. Obviously this is only good for sharpening a square edge, and won't work for the rounded edge of a bowl gouge (not sure correct terminology). If anyone has any suggestions for a cheap way to construct a jig, or a method to get a consistent edge. Also, what are suggested angles for the edge of a roughing gouge and bowl gouge?