First, the basic operation of the fitter The fitter is a method of cutting the workpiece clamped on the vice of the fitter's workbench, which is one of the important tasks in mechanical manufacturing. The basic operations of locksmiths can be divided into: 1. The auxiliary operation is marking, which is the operation of marking the processing boundary on the blank or semi-finished workpiece according to the drawing. 2. Cutting operations include chiseling, sawing, filing, tapping and tapping. Drilling (reaming and reaming), scraping and grinding. 3. Assembly operation is the process of assembling parts or components into machines according to the technical requirements of drawings. 4. Maintainability operation refers to maintenance, that is, maintenance, inspection and repair of machinery and equipment in use. The following content can only be seen by replying to the post. Second, the fitter's scope of work and its role in machinery manufacturing and maintenance 1. The general fitter's work scope (1) is the preparation work before machining, such as cleaning the blank and marking the blank or semi-finished workpiece. (2) Repairable processing of a single part; (3) Drilling, reaming, tapping and tapping. During assembly of parts; (4) Machining precision parts, such as scraping machines or grinders, mating surfaces of measuring tools and tools, and finishing of fixtures and molds. (5) Matching and trimming of parts during assembly; (6) Assembly, debugging, adjustment and maintenance of the machine. 2. The role of locksmith in machinery manufacturing and maintenance Locksmith is a complicated, subtle and demanding job. Although there are various advanced processing methods at present, locksmiths have the characteristics of simple tools, diverse and flexible processing, convenient operation and wide adaptability, so a lot of work still needs locksmiths to do. As mentioned above, the scope of application of locksmiths is effective. Therefore, locksmith plays a special and irreplaceable role in machinery manufacturing and maintenance. However, locksmith has high labor intensity, low production efficiency and high requirements for workers' technical level. 2. The vice is used to clamp the workpiece, and its specification is expressed by the width of the jaw. Commonly used are 100, 125 and150 mm. When using a vise, you should pay attention to: