I did something that took quite a bit of effort (since I had to figure out a few things).
My FIL has a knife without a handle. Asked me to make a handle. The way I chose to do it, was to make a handle out of two symmetrical halves, so that a profile of the tang is removed from both halves. They would "close around the tang" and mate together.
The tang is a little curvy, and I wanted to replicate its shape, both for the heck of it and for snug fit.
I measured the profile every 1/4 inch, using a electronic edge finder as a probe, kind of. (I do have a probe, but have not had a chance to hook it up, more on this later). Then coded it in G code. For the other half, I had to invert the coordinates, so as to get a mirror image.
The bottom line is that after a few mistakes as usual, the halves aligned perfectly and I could press fit the tang between them. Then I used some EDM tubing to make two makeshift rivets.
Considering that my FIL abuses this knife, I will also add a few screws to hold the halves together. These rivets would not "do it".
Alternatively, I may weld them together around the perimeter.i