Always use a bench drill or bead machine, strictly prohibit handheld drills. Calibrate the drill core before installing the bit to ensure concentricity and evenly tighten screws diagonally. Adjust the speed according to the bit diameter: use higher speeds for small-diameter bits, and reduce speed appropriately for large-diameter bits or hardwood. Maintain light, steady feed without forcing. Secure the wood firmly, and align with the original hole when flipping to prevent eccentricity. Wear protective goggles and a mask during operation; never approach rotating tools barehanded. Clear chips and change materials only after stopping the machine. Select appropriate bit materials: high-speed steel suits softwoods, while carbide is suitable for hardwoods. Take care to prevent dropping or collisions. Clean and maintain tools promptly after use, sharpen dull edges immediately, and halt operation for inspection if abnormalities are detected to ensure safety and product quality.