... under the controlling of the computer, the laser focus on the surface of the work piece by F-θ lens ... material: l Automobile Parts: Pistons, Piston Rings, Gears, Shafts, Bearings, Clutch, Lights, etc.l Electronic Components: Resistance, Capacitance, Chips, ... Printed Circuit Boards, Computer Keyboard, etc.,l Mechanical Parts : Bearings, Gears, Standard Parts, Motors, etc.,l Instrument : Panel Signs ...