When programming the computer gong, we should first consider the selection of tool setting point, and the determination of tool setting point and tool changing point. Tool setting point is the starting point of tool movement relative to the workpiece in NC machining. Since the program is also executed from this point, the tool setting point is also called the program starting point or tool starting point.
When the machining accuracy is not high, some surfaces on the workpiece or fixture can be directly used as the tool face; when the machining accuracy is high, the tool setting point should be selected on the design basis or process basis of the part as far as possible, for example, for the part with hole positioning, it is more appropriate to take the axis of the hole as the tool setting point. The tool setting point must have a certain coordinate relationship with the positioning datum of the workpiece. In this way, the relationship between the machine tool coordinate system and the workpiece coordinate system can be determined. The choice of tool setting point for computer gong processing should be convenient for coordinate value calculation and tool setting. During tool setting, the tool setting point should coincide with the tool position. The so-called tool position refers to the intersection of the tool axis and the tool bottom surface for flat end milling cutter; the ball end milling cutter refers to the ball center of the ball head part; the turning tool refers to the tool tip; the drill bit refers to the drill tip; the machining of mechanical parts refers to the focus of the wire electrode axis center and the part surface for wire electrode cutting machine.
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