Please pardon my ignorance but could someone try to help me understand. I use a varigrind jig and have a tool to set the wheel at precisely 40 degrees every time. So when I put my tool in straight up and down I think I'm sharpening the bevel at the top to 40 degrees. Then when I roll it over to the sides, I think I'm still sharpening at 40 degrees. Isn't this the same as a 4040 grind? Is there more to it? What am I missing? Thank you