From my experiance it cost alot more to use the cheaper belts , because you end up using alot more of them. Do not use aluminum oxide belts until finer grits like 320, 400 . I have found in the course grits( I use 60,and 120)that the ceramic Norton hoggers work the best,and will save you money ,because they last for ever. D2 is fairly hard to grind ,but the ceramic makes it much more forgiving.