Gear surveying and mapping is a very important time relief. When gear surveying and mapping, we can comprehensively and systematically understand the basic theories, basic knowledge and skills that need to be mastered, so as to improve the quality of painting and drawing. Surveying and mapping at work is also very important. , One of the common work links.Straight tooth cylindrical gear is a type of gear. What should be done before surveying and mapping of straight tooth cylindrical gear, I will let you know what to do.

　　1. Although there are many parameters and sizes of spur gears, the standard system of various gears stipulates that the module or the diameter pitch is used as the calculation basis for other parameters and the dimensions of each part.Therefore, the surveying and mapping work should make every effort to accurately determine the size of the modulus or the diametral pitch. At the same time, the pressure angle is the basic parameter to determine the tooth profile. Accurate determination is equally important.

　　2. It is necessary to understand the usage and production country of the surveyed gear, so that we can estimate the standard system adopted by this gear.You can observe the tooth profile of the gear. If the tooth profile is curved and the bottom of the tooth groove is narrow and arc-shaped, it can be preliminarily judged to be a modular system. The standard pressure angle is mostly 20 degrees; observe that the tooth profile is relatively straight and the bottom of the tooth groove is relatively flat. The wide arc is small, which can be preliminarily judged as the diameter control, and the pressure angle is 14.5 degrees. The gear hob or standard rack samples can also be used for comparison to determine which pressure angle.

　　If we need to survey and map spur gears, then the preparations described above need to be completed, so that the surveying and mapping work can be completed smoothly.I don't know if you are satisfied with the editor's explanation. Maybe many people still have big questions. If you have any questions, you are welcome to consult customer service.Because of the limitation of the length of the article, the editor will not introduce them one by one.