A orbital sander and a way to clamp the axe to a bench with something like a C clamp.
I used such a set up to thin out the blade of a hachet. 320/400 grit should get you good to go.
I like sex, drugs and automatic weapons. That's why i'm a dues paying member of the Libertarian party. Struggling to keep the government away from messing with the above.
My Wife has her own vice.