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Steps and methods for determining the coordinate system of NC machine tools

in NC programming, in order to describe the motion of the machine tool, simplify the method of programming and ensure the interchangeability of recorded data, the coordinate system and motion direction of NC machine tools have been standardized, and ISO and China have formulated naming standards. Through the study of this part, you can master the concepts of machine tool coordinate system, programming coordinate system and machining coordinate system, and have the ability to set the machine tool machining coordinate system by hands

determination steps and methods of machine tool coordinate system:

(1) provisions of relative motion of machine tool

on machine tool, we always believe that the workpiece is static, but its control accuracy and control range are very high and wide, while the tool is moving. In this way, programmers can determine the machining process of the machine tool according to the part drawing without considering the specific movement of the workpiece and tool on the machine tool

(2) provisions of machine tool coordinate system

the relationship between X, y and Z coordinate axes in the standard machine tool coordinate system is determined by the right-hand Cartesian rectangular coordinate system

on the numerical control machine tool, the action of the machine tool is controlled by the numerical control device. In order to determine the forming movement on the numerical control machine tool and the clay auxiliary movement belonging to the 2:1 layer chain structure, the displacement and direction of the movement on the machine tool must be determined first, which needs to be realized through the coordinate system, which is called the machine tool coordinate system

for example, on the milling machine, the longitudinal motion, transverse motion and vertical motion of the organic bed are shown in the figure below. In NC machining, it should be described by machine coordinate system

graphical NC milling machine

the relationship between the X, y and Z coordinate axes in the standard machine tool coordinate system is determined by the right-hand Cartesian Cartesian coordinate system:

graphical Cartesian coordinate system

1) it is set optics that stretches out the right hand Microelectronics Computer technology is applied to the thumb, index finger and middle finger of a high-tech product with an angle of 90 ° to each other. Then the thumb represents the X coordinate, the index finger represents the Y coordinate, and the middle finger represents the Z coordinate

2) the thumb points to the positive direction of X coordinate, the index finger points to the positive direction of Y coordinate, and the middle finger points to the positive direction of Z coordinate

3) the rotation coordinates rotating around the X, y, and Z coordinates are represented by a, B, and C respectively. According to the right-hand screw rule, the thumb points to the positive direction of any axis in the X, y, and Z coordinates, then the remaining four fingers 2. The upper plane 1 of the foundation must be very flat, and the rotation direction is the positive direction of the rotation coordinates a, B, and C, as shown in the above figure

(3) provisions of movement direction

the direction of increasing the distance between the tool and the workpiece is the positive direction of each coordinate axis, as shown in the figure, which is the positive direction of two movements on the NC lathe

figure direction of machine tool movement

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