CNC lathe processing is a cause with high requirements. If there is a small error in coordinate configuration during the processing and manufacturing of workpieces, the products will be scrapped, and even may bring safety incidents. So how to confirm the coordinate system of CNC lathe?
(1) Reference point of CNC machine tool: the reference point is also an invariable point on the machine tool. It is the limit position of the tool holder movement limited by mechanical stop or electrical device. Its key function is to locate the coordinate system of machine tool.
(2) Machine coordinate system: the right-hand Cartesian Cartesian coordinate system is selected as the coordinate system on the CNC machine tool.
(3) Workpiece coordinate system: workpiece coordinate system is the coordinate system set by the programming staff during programming, also known as programming coordinate system.
Origin of workpiece coordinate system:? In NC programming, first of all, set a point on the part drawing as the origin of programmed coordinate according to the form characteristics and dimensions of the parts to be processed, which is called the origin of programmed coordinate. From the point of view, it’s OK to choose the origin of the workpiece coordinate system at any point on the workpiece, but this may represent tedious calculation problems and add programming troubles. In order to make the calculation simple and simplify the programming, the origin of the workpiece coordinate system is usually selected on the turning center of the workpiece, and the detailed position can be studied and configured on the left end face (or right end face) of the workpiece, even if the programming datum coincides with the design datum and positioning datum.
Tool setting: the coordinate system of machine tool is the only benchmark of machine tool, so it is necessary to know the position of program origin in the coordinate system of machine tool and finish the tool setting. The essence of tool setting is to confirm the only position of the origin of workpiece coordinate system in the machine coordinate system. Tool setting is an important skill in NC machining. At the same time, the efficiency of the tool also directly affects the efficiency of NC machining.
Tool change: when it is necessary to change the tool in the process of NC machining, it is necessary to study and select the appropriate tool change point when programming. The so-called tool change point refers to the position of tool holder rotation and tool change. When the CNC lathe confirms the workpiece coordinate system, the tool change point may be a fixed point or an arbitrary point relative to the workpiece origin. The tool change point shall be set on the outside of the workpiece or fixture, so as to ensure that the tool holder does not touch the workpiece and other parts during tool change.
About the author