1、 Pause instruction G04X (U)_/ P_ It refers to the tool pause time (feed stops, spindle does not stop), and the value after address P or X is the pause time. The value after X must have a decimal point, otherwise it is calculated as one thousandth of this value in seconds (s). The value after P cannot have a decimal point (i.e. an integer) and is measured in milliseconds (ms). For example, G04 X2.0; Or G04 X2000; Pause for 2 seconds G04 P2000; However, in some hole system processing instructions (such as G82, G88, and G89), in order to ensure the roughness of the hole bottom, there needs to be a pause time when the tool is processed to the hole bottom. At this time, it can only be represented by address P. If address X is used, the control system considers X to be the X-axis coordinate value for execution. For example, G82X100.0Y100.0Z-20.0R5.0F200P2000; Drill (100.0100.0) to the bottom of the hole and pause for 2 seconds G82X100.0Y100.0Z-20.0R5.0F200X2.0; Drilling (2.0100.0) to the bottom of the hole will not pause.

2、 The difference and connection between M00, M01, M02, and M30 M00 is an unconditional pause instruction for the program. The program execution stops at this feeding point and the spindle stops rotating. To restart the program, you must first return to the OG state, press CW (spindle forward rotation) to start the spindle, and then return to the AUTO state, press the START key to start the program. M01 is a program selective pause instruction. Before executing the program, you must open the OP STOP button on the control panel to execute it. The effect after execution is the same as M00, and you need to restart the program as above. M00 and M01 are often used for inspection or chip removal of workpiece dimensions during machining. M02 main program end instruction. Execute this command, the feed stops, the spindle stops, and the coolant is turned off. But the program cursor stops at the end of the program. M30 main program end instruction. The function is the same as M02, but the difference is that the cursor returns to the program header position, regardless of whether there are other program segments after M30.

What are the advantages and disadvantages of CNC machine tools compared to ordinary machine tools

(1) Advantages

1. High machining accuracy and high machining quality;

2. Capable of multi coordinate linkage and processing complex shaped parts;

3. When processing parts, it is generally only necessary to change the teaching and control program. Can save production preparation time;

4. CNC machine tools have high accuracy and rigidity, and can choose favorable processing quantities with high productivity (usually 3-5 times that of ordinary machine tools);

5. High degree of automation in machine tools can reduce labor intensity;

6. Mass production, easy to control product quality;

(2) Disadvantages

1. Low requirements for the quality of operators and high technical requirements for maintenance personnel;

2. But its processing route is not easy to control and is not as intuitive as ordinary machine tools;

3. Its maintenance is inconvenient and its technical requirements are high;

4. The process is difficult to control;