Rules for the coordinates and direction of movement of CNC machine tools
In the numerical control machine tool, the coordinate axes X, Y, and Z of the linear motion of the machine tool are defined as the right-handed Cartesian coordinate system according to ISO and China's JB3051-82 standard. The three rotary motions A, B, and C respectively indicate the rotational motion of the axis parallel to X, Y, Z, as shown in Fig. 1. The positive direction of X, Y, and Z is the direction in which the workpiece size is increased, that is, the direction in which the distance between the workpiece and the tool is increased. Usually the axis parallel to the axis is the Z coordinate (ie the movement of the Z coordinate is specified by the spindle that transmits the cutting power), while the X direction is horizontal and parallel to the workpiece loading surface, and the last Y coordinate can be pressed by the right hand card. The child coordinate system is used to determine.
The forward direction of the rotational motions A, B, and C is correspondingly the direction in which the right-handed thread advances in the positive direction of the X, Y, and Z coordinates. The above regulations are the case where the workpiece is fixed and the tool is moved. On the other hand, if the workpiece moves, its forward direction is represented by X', Y', Z', respectively (as shown by the broken line in Fig. 1). However, it is usually the positive direction of the coordinates when the tool moves as the forward direction of the programming. Figure 2 shows the axes and directions of the CNC lathe and the non-lifting CNC milling machine.
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