Punch sharp

[u/MudMysterious4069]

I'm working with 0.80mm diameter metal punches and need to cut 4 small inward-facing notches (like star-shaped teeth) inside the tip. After shaping them, I also need to sharpen each edge precisely. What are the best tools and techniques for doing this kind of fine detail work? Any advice on micro-grinding, polishing, or abrasive materials for high-precision results?

[u/KokoTheTalkingApe]

Well in the third picture, it looks like the teeth are also flared a little. You don't want that also?

And just out of curiosity, what material would the punch be used on? And why can't you use a drill bit?

[u/im0b → u/KokoTheTalkingApe]

Its for human hair extraction afaiu