Jigs and fixtures are both tools used to fix and support workpieces in the manufacturing and processing fields, but they have the following differences:
1. Different functions: The jig is mainly used to guide tools to position, clamp and guide the workpiece to ensure the accuracy and consistency of the workpiece during processing. Fixtures are more used to stabilize workpieces for processing operations, such as drilling, milling and cutting, to ensure the accuracy and safety of operations.
2. Different flexibility: Jigs are usually designed for specific processes and processing tasks. They may be special tools for a specific workpiece. In contrast, fixtures are typically more versatile and can be adapted to multiple workpieces or a variety of machining tasks.
3. Designed and constructed differently: Jigs often have adjustable elements, such as clamping and positioning, to accommodate workpieces of different sizes and shapes. They are more flexible and easier to adjust. Fixtures generally have a fixed shape and position, pay more attention to the stability of the fixed workpiece, and do not require frequent adjustments.
4. Different fields of use: Jigs are often used in more precise processes, such as machining centers, milling machines, lathes, etc., to ensure the accuracy and quality of processing. Fixtures are more commonly used for relatively simple machining tasks such as drilling, threading and assembly.
Additionally, there are some other differences or features:
5. Different application scenarios: Jigs are mainly used in mechanical processing, electronic manufacturing, mold processing and other industries, while fixtures are more commonly used in vehicle body manufacturing, assembly, welding and other industries.
6. Material differences: Fixtures are generally made of high-strength, high-hardness, and high-stability materials (such as carbide, tool steel, etc.), while fixtures are generally made of solid metal materials (such as cast iron, steel, etc.). The material selection of the two is also related to the processing technology, service life, etc.
7. Different manufacturing processes: Jigs generally require high-precision metal processing processes, including CNC machine tool processing, wire cutting, EDM, etc. The manufacturing process of fixtures is relatively simple and can use casting, sheet metal and other processes.
It should be noted that the lines between jigs and fixtures are sometimes blurred, and they may be used broadly or interchangeably depending on the specific industry and application context. In actual applications, according to specific needs and process requirements, appropriate jigs or fixtures can be selected to complete the work. Although jigs and fixtures are similar in some aspects, the appropriate tool should be selected based on specific needs and processing requirements in actual applications. 
