I am currently engraving bullet casings with a manual new Hermes engraving machine. I want to streamline the process a little bit and get a cnc router or laser engraver. The problem I'm having when I look up the machines, is I don't know if they can engrave on the rounded surface or not. What is an inexpensive beginners engraving machine? would prefer it to be desktop sized and am I better off with a router or laser engraver? Any help is appreciated.