What are the commonly used compensation methods for CNC machining centers? Now let me introduce it to you all.
I. Tool Length Compensation:
Tool length is a very important concept. When programming a part, we first need to specify the programming center of the part, and then establish the workpiece programming coordinate system. This coordinate system is just a workpiece coordinate system, and the zero point is generally on the workpiece. Length compensation is only related to the Z-coordinate. It is different from the programming zero points in the X and Y planes because the tool is positioned by the spindle taper hole and does not change. For the zero points in the Z-coordinate, it is different. The length of each knife is different.
Two methods of tool length compensation
1) Use the actual length of the tool as compensation for the tool length (this method is recommended).
Using the tool length as compensation means measuring the length of the tool with a tool setter and then inputting this value into the tool length compensation register as the tool length compensation.
2) Use the distance value between the tip of the knife and the programming zero point in the Z direction (which can be positive or negative) as the compensation value.
This method is applicable when there is only one person operating the machine tool and there is not enough time to measure the length of the tool with a tool setter. When using one tool to process another workpiece in this way, the tool length compensation setting needs to be reset. When using this method for tool length compensation, the compensation value is the distance the tool tip moves from the Z-coordinate zero point of the machine tool to the programming zero point of the workpiece. Therefore, this compensation value is always negative and very large.
3) Tool length compensation is achieved by executing instructions containing G43 (G44) and H. At the same time, we provide a Z coordinate value, so that the tool moves to a distance of Z from the workpiece surface after compensation. Another command, G49, is used to cancel the G43 (G44) command. In fact, we don't need to use this command because each tool has its own length compensation. When changing tools, the G43 (G44) H command is used to assign its own tool length compensation and automatically cancel the length compensation of the previous tool.