Self-production of metal knives without professional equipment is a rather complex and challenging task. Nevertheless, you can try the following methods and steps, but pay attention to safety and practicality: 1. **Material selection**: - Choose suitable metal materials, such as stainless steel, tool steel or high carbon steel. These materials can be recycled from old tools, discarded machine parts, etc. 2. **Design the tool**: - Design the tool you want to make on paper. Clarify the shape, size and function of the tool, which will help in subsequent production. 3. **Basic tools**: - Prepare some basic tools, such as hammers, files, hand drills, saws, etc. Although these tools are not as precise as professional equipment, they can still be used for preliminary processing. 4. **Cutting and shaping**: - Use a saw to cut the metal material into a rough shape. Then use files and sandpaper to gradually trim the edge of the tool to achieve the desired shape and smoothness. 5. **Heat treatment**: - In order to increase the hardness of the tool, a simple heat treatment method can be used. Heat the tool (you can use an open flame, furnace, etc.), and then quickly immerse it in oil or water to cool it. This process is called quenching. 6. **Sharpening the Edge**: - Use a file and a grindstone to sharpen the edge of the knife. Usually the edge of the knife needs to form a specific angle (such as 20°-30°), which will affect the cutting performance of the knife. 7. **Inspection and Adjustment**: - After completion, check the sharpness and overall structure of the knife. If necessary, you can continue to trim and grind until you achieve a satisfactory result. 8. **Safety Note**: - When performing metal processing, always pay attention to safety and wear goggles and gloves to avoid injury. Although these steps can help you make simple knives at home, the final result may not reach professional level. In addition, it is recommended to try to understand the relevant metal processing knowledge before engaging in such activities, or seek guidance from professionals.