1 INTRODUCTION As a kind of automatic positioning component or module, CNC mechanism is widely used in the field of machine equipment and automation equipment. Compared with the system ontology, the NC mechanism is only an independent component, has its mechanical origin and coordinate system, and its role is in the system ontology, has its own distribution rules and coordinate system. In theory, we should ensure that the two coordinate systems are in the correct positional relationship to ensure the system's working requirements. In fact, during assembly adjustment, due to the manufacturing and installation errors of the numerical control position components and the system body, in order to facilitate the assembly and processing, it is usually only necessary to ensure that the numerical control component and the system body satisfy a certain position condition, and a certain position adjustment method is used. Make corrections. The author used the coordinate position correction method to achieve the normal positional relationship of the system in the assembly of the numerical control positioner of the gene chip automatic analysis instrument and the laser two-dimensional scanning apparatus of the projection type automatic perimeter, and reduced the technology of the assembly adjustment work. Difficulty. 2 Method of automatically finding the origin The mechanical origin is the absolute zero point of each coordinate axis of the numerical control mechanism, which is the basic reference point of the movement position of each coordinate axis, and is uniquely determined by the zero position switch installed on each axis. Because the mechanical system has a certain inertia when moving, the motor rotates with three stages of up-, steady-, down-frequency. To ensure that the CNC mechanism stops when the zero-position switch is triggered, the motor must run at a constant low frequency. The speed section. When the system automatically finds the origin, it checks whether the zero switch triggers after one step of movement in the specified direction. If the switch is working, the position is determined as the zero point of this coordinate axis. 3 CNC mechanism position correction software and control panel design To solve the position adjustment problem of CNC mechanism, the author designed the basic calibration software and control panel, and studied the calibration algorithms of some CNC mechanisms, including the following functions. The jog mode is to adjust the position of the coordinate axis of the numerical control mechanism. The control panel is designed with the jog mode of each axis, and the minimum jog equivalent is the minimum motion equivalent of the motor. Auto-finding the origin automatically finds the origin and displays the distance or number of steps. The x-gozero(),y-gozero() function is designed. The correction algorithm is the core of the position adjustment of the numerical control mechanism. Different numerical control mechanisms must determine their own correction algorithm. The configuration file records the basic parameter values ​​of the position correction of the numerical control mechanism, and is automatically generated after being calculated by the correction algorithm, as the basic configuration file of the normal operation of the numerical control mechanism. 
Sind1= c-z1 [(x1-a)2+(y1-b)2+(z1-c)2]1â„2 tgh1= |y1|+b x1-a sind2= c-z2 [(x2-a)2 +(y2-b)2+(z2-c)2]1â„2 tgh2= |y2|+b x2-a (1) Solve the above equations to get a, b, c adjustments a= x1tgh1-x2tgh2+|y1|-|y2| tgh1-tgh2 b= (x1-x2)tgh1tgh2+|y1|tgh2-|y2|tgh1 tgh1-tgh2 c=z1+|tgd1|[(x1-a)2+( Z1-b)2]1â„2 (2) From the above analysis, after the laser two-dimensional scanning device is installed, the light beam is moved from the zero point to the known two points of the hemispherical screen, and the motion values ​​of the two rotating axes are determined and substituted ( 2) The actual position O'(a, b, c) of the laser can be calculated as the basic parameters of the cursor position control. 6 Conclusion Positioning of CNC components and system body is critical to the quality of the system. Low speed zero return is the precondition to ensure the accurate positioning of the axes on the mechanical origin. Different CNC mechanisms can choose certain adjustment and correction methods to reduce the technical difficulty of assembly.
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Sind1= c-z1 [(x1-a)2+(y1-b)2+(z1-c)2]1â„2 tgh1= |y1|+b x1-a sind2= c-z2 [(x2-a)2 +(y2-b)2+(z2-c)2]1â„2 tgh2= |y2|+b x2-a (1) Solve the above equations to get a, b, c adjustments a= x1tgh1-x2tgh2+|y1|-|y2| tgh1-tgh2 b= (x1-x2)tgh1tgh2+|y1|tgh2-|y2|tgh1 tgh1-tgh2 c=z1+|tgd1|[(x1-a)2+( Z1-b)2]1â„2 (2) From the above analysis, after the laser two-dimensional scanning device is installed, the light beam is moved from the zero point to the known two points of the hemispherical screen, and the motion values ​​of the two rotating axes are determined and substituted ( 2) The actual position O'(a, b, c) of the laser can be calculated as the basic parameters of the cursor position control. 6 Conclusion Positioning of CNC components and system body is critical to the quality of the system. Low speed zero return is the precondition to ensure the accurate positioning of the axes on the mechanical origin. Different CNC mechanisms can choose certain adjustment and correction methods to reduce the technical difficulty of assembly.
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