Quote Originally Posted by chipmaker4130 View Post
They are dull for a reason: durability. They cut steel just fine and hold up fairly well. If you get the same shape designed for aluminum they are sharp! The aluminum-type cutters are usually polished to a mirror finish too. I recommend against a cheap shank if you go this route. It is imperative that all the inserts line up correctly or you'll never get a good result. In the case of a 3/4" indexable endmill you will probably find more 3-'flute' than 2.
Honing or intentional dulling should improve HSS tools also when done in right amount. Havent seen actually used but heard from some old machinist that they used to hone the lathe roughing tools slightly with very fine abrasive cloth.