The Z-axis tool setting data of the tool is related to the clamping length of the tool on the tool holder, the workpiece coordinate system and the zero position of the machine coordinate. 3 axis cnc vertical milling machine There are many tools, and the distance from each tool to the zero point of Z coordinate is different. The difference of these distances is the length compensation value of the tool. Therefore, it is necessary to measure the length of each tool on the machine tool or on a special tool setting instrument (that is, tool preset), and record it in the tool schedule for use by the machine tool operator. Z-axis tool setting usually has two forms.
1. Standard to + the difference of each knife relative to the standard knife
1. Select a tool (also called a standard tool) for tool calibration, and input the Z-axis mechanical coordinate value obtained after tool calibration into the Z-axis in G54.
2. Measure the difference of the other tools relative to the standard tool, pay attention to the input with the sign here, and make a record. When there is an external tool setting instrument, the relative difference can be carried out on the tool setting instrument, otherwise it will be carried out on the machine tool.
3. Input the recorded value into the corresponding length compensation value one by one. The length compensation is divided into shape compensation and wear compensation, and the recorded value is the shape compensation value. Note: G43+shape compensation value is used in the processing program, and G44 command no longer appears.
Features: If the operation is troublesome, if the difference between each tool and the standard tool needs to be measured separately; the corresponding relationship is complicated. When the standard tool is replaced, the length of the remaining tools will be affected and some adjustments are needed; the adaptability is not strong.
2. Direct use of length compensation H function
Each tool is set separately, and the mechanical coordinate value obtained by the tool setting is input into the length value H of the corresponding tool number (this value is negative), there is no corresponding relationship between them, the Z value in G54 It is 0. When the external instrument is used, only one knife needs to be selected for tool calibration, and the remaining knives are performed on the tool calibration instrument. The specific steps are as follows.
1. Select a flat knife (also called a standard knife) for tool calibration, and input the Z-axis mechanical coordinate value after tool calibration into the length value H of the corresponding tool number, and set the secondary value to L.
2. Use the tool setting instrument to measure the difference of each tool relative to the standard tool. The standard tool length is negative, otherwise it is positive, and make a record.
3. Use the length value L of the standard tool to respectively add the difference after the measurement, and then enter the corresponding tool length compensation value H.
Features: The tools are relatively independent, there is no relative relationship, and the operation is convenient. This method has been widely used.
In the operation of 3 axis cnc vertical milling machine, when there are fewer tools, such as 6 tools, the length compensation of the tools can also be input into G54~G59 respectively, so that each tool corresponds to a coordinate system.
