When it comes to CNC machining, tool setting is a critical skill and the primary operation. The accuracy with which parts are machined is dependent on the accuracy with which the tools are set. Furthermore, the effectiveness of tool setting will have an impact on the effectiveness of CNC machining. As a result, it is critical to be familiar with the different types of CNC machining. This guide will cover the top seven methods of cnc services setting for machining.
What Is the Process of CNC Machining Tool Setting?
In CNC machining, tool setting is the process of establishing the workpiece coordinate system, which is the process of determining the position of the workpiece on the machine tool's workbench. To put it another way, it is the process of determining the coordinates of the tool setting point within the machine tool coordinate system. The tool setting point in CNC machining refers to the point at which the tool begins to move in relation to the workpiece during the machining process. The setting point for a CNC machining tool can be set on the workpiece, but it can also be set on the CNC machine tool or on the fixture. If it is set at a specific point on the fixture or on the lathe cutting tools, the point must maintain a specific precision dimensional relationship with the workpiece's positioning datum.
When setting up a tool, it is important that the tool location and the tool setting point are the same. The tool's location is defined as the point at which the tool is being used to position itself. The tool tip is the location of the tool in the case of turning tools. During CNC machining tool setup, it is necessary to determine the absolute coordinate value of the tool setting point in the machine coordinate system and to measure the tool position deviation. The accuracy with which the tool point alignment is performed will have an impact on the machining accuracy. In the actual processing of the workpiece, one tool is frequently insufficient to meet the demands of the processing, necessitating the use of multiple tools at the same time. It is necessary to start processing with different starting positions for different tools when using multiple tools, even when the tool change position remains the same, in order to ensure that the program continues to function normally. The function of tool geometric position compensation is included in the CNC machine tool system's capabilities. When using the tool geometric position compensation function, as long as the position deviation of each tool relative to a pre-selected reference tool is measured and input into the CNC system, the tool geometric position compensation function is effective.
It is possible to automatically compensate for tool position deviation in the tool path by using the t instruction in the machining program, provided that the group number specified in the tool parameter correction column is greater than zero. The operation of tool setting is also required for the measurement of tool position deviation.
CNC Machining Tool Setting Methods That Are Frequently Used
In CNC machining, the most fundamental methods of tool setting are the trial cutting method, the tool setting instrument, and the automatic tool setting method. Now, take a look at some of the most common methods of CNC tool setting listed below.
1. Perform a cutting trial and check the knife alignment.
This method of CNC tool setting will leave cutting traces on the surface of the workpiece, and the accuracy of the tool setting is relatively low, but it is simple and convenient.
2. Alignment of the feeler gauge, standard mandrel, and block gauge on the tooling
This CNC tool setting method, which is similar to the trial cutting tool setting method, does not require the spindle to be rotated during the tool setting process. A feeler gauge is placed between the tool and the workpiece, and the feeler gauge is not allowed to move freely in either direction. When calculating the coordinates, it is necessary to subtract the thickness of the feeler gauge from the result. Even though the spindle does not need to rotate in order to cut, this method of tool setting does not leave traces on the surface of the workpiece; however, the accuracy is not high enough.
3. Tool alignment using an edge finder, an eccentric bar, and a shaft setter (optional).
It is very similar to the trial cutting method, except that the tool is replaced by an edge finder or an eccentric bar instead of the cutting blade. This method is extremely popular because of its high accuracy and efficiency. When using the edge finder, it is important to make sure that the steel ball part of the tool comes into contact with the workpiece just a little bit. Meanwhile, the workpiece to be processed must have a good conductivity, and the positioning reference surface must have a smooth surface roughness. The Z-axis setter is most commonly used to transfer (indirect) tool alignment from one machine to another.
4. Alignment of the transfer (indirect) knife.
A workpiece cannot be machined with a single tool because the length of the second tool is inconsistent with the length of the first tool, so it is necessary to re zero; sometimes the zero point will be processed out and cannot be recovered directly; it is not permitted to damage the machined surface; some tools or occasions cannot be directly set; in this case, the indirect zero method can be used.
5. Alignment of the tool with the help of a tool aligner
The traditional method of tool setting in brass cnc machining is insecure, requires a large number of opportunities, and produces a large amount of random error, which makes it difficult to adapt to the rhythm of CNC machining and is incompatible with the function of the CNC machine tool. Because of the special tool setting device, the tool setting accuracy is high, efficient, and safe, which simplifies the work and ensures that CNC machine tools operate at high efficiency and accuracy, resulting in reduced labor costs. It has evolved into an essential special tool in the CNC machining industry for resolving the problem of tool setting.