I have a few shaves & recently added the LN Boggs convex shave. They were a joy to use on the edges of 1/8 inch cherry. When I had to use them on the 1 inch wide face of cherry, they worked but chattered. When I used them on 4 inch wide cherry they chattered even more. It was difficult to get a smooth ready to finish surface from the shave - I had to resort to sandpaper. The piece was concave with a radius of about 4 inches. Thoughts?