/diy/ - Do It Yourself

I need to machine/grind two semi circles into a piece of bar. I don’t have a lathe or router table. Only a drill press, chisels, hacksaw, and sandpaper. Should I just start making a kerf where I want the semi circle then grind it out with sandpaper/etc until it’s a semi circle and can clamp onto bar?

I’m trying to make picrel from bar, and no I’m not buying one of these. I got free time and I’d like to make my own since it’s the /diy/ spirit and I could use some project experience.