III. Direction: Read and understand the procedures carefully if it is scratching Method write SCRATCHING and TAPPING if Tapping Method. 1. Strike the end of the electrode on the plate surface similar to striking a match. 2. Move an electrode to the start position and then reduce the arc length to a distance equal to the diameter of the electrode. 3. When a spark appears, withdraw the electrode. 4. Lower the electrode on the plate surface. 5.When a spark appears, withdraw the electrode quickly and draw an arc of approximately 6mm.
