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Three common CNC machining compensation methods

2022-07-25 10:28:23
times

CNC machining factory in CNC machining there are three kinds of compensation: most of them can solve the trajectory problems caused by the shape of the tool during machining. Three kinds of compensation are generally used in the processing program.


One, the tool length compensation


Two, two, tool radius compensation :


When the programmer is ready to prepare a program to process the shape of the workpiece with a milling tool, first according to the size of the axis CNC machining workpiece and the radius of the tool for detailed coordinate value measurement to determine the route of the center of the tool. At this point, the radius of the tool used is only the radius value of the milling cutter. As you struggle to program and find that the milling cutter is not suitable for other tool diameters, the programmer will tirelessly recalculate the coordinate values for the line of the tool center. This is not too much of a problem for a simple part, it is simply too difficult to recalculate for a mold with a complicated profile.


The appearance of the workpiece is divided into initial machining and finishing, and initial machining is completed when the initial machining program is prepared. Due to the initial machining, the size of the workpiece changes, and then the calculation of the center coordinate value of the finishing tool is more work. At this time, these troubles are solved if the tool radius compensation is used. In the radius compensation memory, we can ignore the line programming and then put the tool radius into the radius compensation memory as radius compensation. Whether it is a temporary change of milling cutter or rough and fine machining, just change the compensation value of the tool radius to control the size of the workpiece, basically no need to modify the program.


III. Fixture offset compensation.


Just like tool length compensation and radius compensation, the programmer can use fixture offset without considering the tool length and size so that the programmer can use fixture offset without considering the workpiece fixture position.


When CNC machining custom machining centers machine small workpieces, the fixture can hold several workpieces at a time. The programmer does not need to consider each workpiece's seating zero when programming, but only needs to program to his or her programming zero and then use fixture offsets in each workpiece to move the machine's programming zero. The fixture offsets are applied with fixture offset commands G54 to G59. There is also a way to set the coordinate system using the G92 command. After the workpiece is machined, G92 is applied to the next workpiece to reset the new workpiece coordinate system. The above are three common compensation in CNC machining, which brings great convenience to its programming and processing and can greatly improve efficiency.


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