A 40/40 grind is possible on a Tormek, but it's not recommended. The main reason is that the Tormek grinding wheel is not designed for this type of grind. It will work, but you'll end up with a lot of glazing on the wheel and it will take longer to get the desired results. In addition, the Tormek does not have a built in stops like some other grinders, so it's easy to overshoot your desired angle.