How can we get a driver's license? We have to go through a process of driving. We must go to the driving school for training, training and examination. After passing the qualification, we can get a driver's license. Little friends will find that most of them are Volkswagen's car. The co-pilot's position is set up with brakes. The coaches will guide the trainees on the side to prevent them from happening. The coach will hurry on the brakes. The coach is a special vehicle designed specifically for students in driving schools. The special vehicle naturally has its special design performance. The vehicle is equipped with safety mirrors such as auxiliary rearview mirrors, auxiliary brake pedals, and fire extinguishers. It is designed for the safety of trainees, coaches and other vehicles during road training. Today's coaches are generally refueling cars, not only low cost, but also very practical. So driving school can not only look at the price when choosing a coach, but also depend on reliability and durability. As coach of the coach, the head coach always pays attention to the care and maintenance of the car, insists on the daily maintenance of the car, checks the car's capacity, safety performance, safety status, and usage conditions. The coach is on the train. Before the vehicle is collected, the vehicle must be thoroughly inspected. The contents of maintenance refer to the regulations of the Ministry of Transport and carefully fill out vehicle technical files. The contents of routine inspections include whether the components in the vehicle are operationally flexible, such as the performance of steering lights, brake pedals, auxiliary brake pedals, secondary rearview mirrors, accelerator pedals, and clutch pedals. Find faults should be promptly repaired and eliminated so as to avoid causing accidents. The coaches must insist on the three-inspection system of vehicles, which is the "three-inspection" system before training, training and training. With a driver's license you still do not rush to hit the road, it is best to practice for some time, after all, each car's performance and control are not the same, coaches and private cars really open up feeling is still not the same, after all, the coach Is a modified car, designed for everyone to use and learn.
High Precision Machining is defined as a process of changing the dimensions or the performance of workpiece with machining facilities.
According to the temperature of the workpiece while in machining, high precision machining can be divided into cold working and hot working. Usually, machining under indoor temperature, and won't change cause chemical change or phisical phase change is named cold working. On the other hand, if under temperature, higher or lower than room temperature, which will lead to chemical changes or phase changes, it will be called as hot working.
For high precision machining, the machining tolerance can be up to 0.0001-0.001mm, the surface finish Ra can be 0.02-0.1um.
Machining precision is to describe the actual geometrical parameter of the part after machining, such as the size, the form, the position, comparing with the theoretical geometry parameter. The difference from these two parameters is the machining tolerance. The number of the difference show the machining accuracy, the bigger, the lower of the machining precision, the smaller, the higher machining precision.
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