I do not know if it will sharpen end mills BUT it does sharpen drill bits from 1/8" to 1/2" as well as metric sizes,It is simple to use, nearly foolproof and it seems to do the job very well. When sharpening larger drill bits it seems wise to me to go slowly to allow the CBN abrasive to do the grinding, not your muscles. My only criticism is where do I find spare parts? It is a long way to China and with current shipping delays and costs getting replacement grinding wheels is a real problem. I tried the Tormek DBS22 and in 5 hours I sharpened 5 bits. But with this machine, i sharpened 5 bits in far less than 10 minutes. Just understand that getting grinding wheels is a hassle. I need one as I was careless and flaked off a bit of CBN back beveling an 1/8" bit so take your time with very small bits. Perhaps even skipping back beveling. I found my on another site for less including tax so it pays to shop around. A final note - this machine is sold by a great number of companies with designations such as 12A, and 13B. But it seems many are made to near identical standards.
GMH 
