Is the laser engraving method okay for lettering on metal?

Can.

Laser engraving processing is the use of CNC technology as the basis, the laser as the processing medium. Processing materials in the laser engraving irradiation instantaneous melting and gasification of physical denaturation, can make laser engraving to achieve the purpose of processing.

Common materials

Non-metallic materials processing (co2 laser): plexiglass, wood, leather, fabric, plastic, printing vinyl, two-color plate, glass, synthetic crystal, horn, cardboard, density board, marble, jade and so on.

Metal material processing (YAG laser) common metal materials.

Laser engraving system has 3 main components: high energy laser, laser transmission system, optical system, by adjusting the focal length, to adjust the energy per unit area.