Rob, you would laugh if you saw all my gravers, I bet I have 5
dozen. I keep them on a rotating tree. I sort of use them all but
primarily points (onglette), flats and rounds. The bare minimum
would be points and flats, like 3 of each, sort of small, medium and
large. I like round handles. Blaine Lewis has a great graver
sharpening video available online that you should watch. I did a
quick search but could not find it. I think it's in the bench tube
library? You can get away with a bench grinder to sharpen, no need
to buy a hone at first. I will see where the thread goes before I
bore with paragraphs of details about how to use a graver.
A friend just send me this cool link showing a talented
engraver/setter at work. You may enjoy watching the graver work?