【正文】 paration and the different procedures. Such pensation from the puter automatically calculate and adjust. Another new method is used in the machine tool length sensors. In this way, by connecting with the heartaxis sensors measuring the length of a pensation tool. The measurements will be used to correct procedures in the tool path. 8) diagnosis. CNCC many modern machines with detection machine tools and MCU operation of a fault or whether signs of the fault line diagnostic capabilities. When failures occur or impending failure, the controller monitors will show the image of the corresponding information. System stop working or remain the severity of the fault will be decided. Another diagnostic capabilities to help repair personnel use to decide whether to stop the use of machine tools. Failure occurred when one of the biggest question is whether the reasons for the fault diagnosis. Through their monitoring and analysis of the functioning of the system to determine and municate the reasons for the failure. 9) munications interface. According to interface connector of the favorable trends and the development of the current work equipment, most of the modern CNC controllers are equipped with a standard link interface, ease of machine tools and other puter and puterdriven link. ○ 4 The numerical control programming Numerical control engine bed is one kind of highly effective automation processing equipment, it according to the processing procedure, automatic to is processed strictly the work piece to carry on the use in from the numerical control system exterior input the procedure which processes being called directly the numerical control processing procedure, the Jian Chengwei numerical control procedure, it is the engine bed numerical control system application software. The numerical control system type is many, they use the numerical control program language rule and the form are also different, when in view of some numerical control engine bed establishment processing procedure, should strictly carry on the programming according to the engine bed programming handbook in 9 stipulation. The establishment numerical control processing procedure is uses the numerical control engine bed an important technical work, not only the ideal numerical control procedure should guarantee processes conforms to the ponents pattern request qualified ponents, but also should enable the numerical control engine bed the function to obtain the reasonable application and the full display, enables the numerical control engine bed the security, reliable, the highly effective work. Numerical control programming content and step The numerical control programming is refers from the ponents blueprint to obtains the numerical control processing procedure the pletely work process. The programming work mainly includes: (1) Analysis ponents pattern and the formulation craft plan This work content includes: Carries on the analysis to the ponents pattern, is clear about the processing the content and the request。 The determination reasonable feeds the route and the choice reasonable cutting specifications and so on. This work requirement programmers can to the ponents pattern technical characteristic, the geometry shape, the size and the technological requirement carry on the analysis, and unifies the elementary knowledge which the numerical control engine bed uses, like numerical control engine bed specification, performance, numerical control system function and so on, determination processing method and processing route. (2) Mathematics processing After had determined the craft plan, needs according to the ponents geometry size, the processing route and so on, to calculate the cutting tool center path, obtains the knife bit data. The numerical control system has the straight line interpolation and the circular arc interpolation function generally, regarding the processing the simple plane ponents which is posed by the circular arc and the straight line, only needs to calculate in the ponents outline the neighboring geometry element point of intersection or the tangential point coordinate figure, obtains various geometries element the beginning, the end point, the circular arc center of circle coordinate figure and so on, can satisfy the programming request. When ponents geometry shape with control system interpolation function inconsistent, needs to carry on the plex value putation, needs to use the 10 puter assistance putation generally, otherwise pletes with difficulty. (3) Compilation ponents processing procedure After pletes the above craft processing and the value putation work, then piles the ponents processing programming personnel uses the numerical control system the program directive, according to the stipulation procedure form, piles the processing procedure section by section. The programming personnel should to the numerical control engine bed function, the program directive and the code is extremely familiar, can pile the correct processing procedure. (4) Programmed check will pile the processing procedure input numerical control system, might control the numerical control engine bed the processing before official processing, must carry on the examination to the may use the engine bed spatial revolution the way, inspects the engine bed movement and the path accuracy, test routine. The high ponents regarding the shape, also may use the aluminum, the plastic or the paraffin wax and so on easy to cut the material to carry on tries to cut the test inspection test sample, not only may confirm the procedure is whether correct, but also may know whether the processing precision does conform to the requirement. If can use with is processed the ponents material same material to carry on tries to cut, then can reflect the actu