I have a large billet which was cut through a knot. I want to make
perfect dapping impressions on this very hard wood so I can
form metal on it. Any suggestions on how to go about this?
You didn't say how large you want these impressions to be, but ball
burs would do it. I do have a cylinder bur with a hemispherical end
that is about a half inch in diameter. I think it's a woodworking
tool. Try your local hardware store.
Jerry in Kodiak