machine coordinate system

- Nov 25, 2020-

After the machine tool has established the "machine coordinate system" and "fixed coordinate of the tool setting tool" (the different fixed tool coordinate values of the tool setting tool should be set to different fixed coordinate values), the working principle of the tool setting tool is as follows:

1. After each linear motion axis of the machine returns to its respective mechanical reference point, the relative positional relationship between the machine coordinate system and the fixed coordinate of the tool setting tool establishes a specific value.

2. Whether the automatic tool control is used or manual control is used to operate the tool setting tool, when moving the tool along one of the selected axes, the tool tip (or the outer diameter of the power rotating tool) is pressed against and touches the tool setting tool. The corresponding plane of the four-sided probe and the high-precision switch sensor is triggered by the swing of the flexible support rod, the switch immediately informs the system to lock the movement of the feed axis. Because the digital control system treats this signal as an advanced signal, the control of the action is extremely rapid and accurate.

3. Since the linear feed axis of the CNC machine tool is equipped with a pulse encoder for position loop feedback, the numerical control system also has a counter for memorizing the actual position of the feed axis. At this point, as long as the system reads out the exact position of the axis stop, the initial tool offset value of the tool tip (or diameter) of the axis tool can be determined through the automatic conversion of the relative relationship between the machine tool and the tool setting tool. . In other words, if it is measured in the machine tool coordinate system, it is equivalent to determining the distance from the machine tool reference point to the zero point of the machine coordinate system, and the distance between the measuring point of the tool and the zero point of the machine coordinate system, and the distance between the two. The actual deviation value.

4. Whether it is the wear of the tool after cutting the workpiece or the change of the tool tip after the heat elongation of the screw, the CNC will automatically perform the new tool offset value with another tool setting operation. The initial tool offset value is compared and calculated, and the error value to be compensated is automatically added to the tool compensation memory area. Of course, if a new tool is changed and the tool is re-adjusted, the obtained offset value should be the new initial tool offset value of the tool.