[Durkee]

It's a little more complicated than that, but I'll try. There are several different ways to sharpen one manually. A tool and cutter grinder works best. You can use a 1A1 wheel or some use an 11V9 cup wheel. I used to use an air bearing fixture to grind o.d.'s. You have a finger that stays lined up with the wheel. The table stays stationary. The fixture rocks back to allow the end mill to pass by the wheel w/o hitting. Then you rock the fixture forward toward the wheel while at the same time gently setting the flute of the end mill on the finger. Once the fixture is all the way forward, you pull the end mill through the air bearing until the end comes off the finger. Repeat for each flute. That was an extremely abbreviated course on the o.d. Most machinists, unless they have grinding experience or at least the right equipment find it more economical to find a grinding shop that is in the area. If you really want to know more, let me know.