When carving a tea tray, the engraving machine determines the appropriate tool size according to the size and design requirements of the tea tray. Take a small tea tray as an example, and use a fillet knife with a diameter of 3-5 mm, which is suitable for carving details, such as lines and patterns. Taking a medium-sized tea tray as an example, using a fillet knife with a diameter of 5- 10 mm can remove materials faster and improve efficiency.