Treatment Of Common Tool Setting Problems In CNC Machining – Principle Analysis, Main Methods & Measures

When machining a tool, the position of the starting point of the tool position in the workpiece coordinate system needs to be determined by the tool setting. The specific position of the workpiece in the machine tool coordinate system is mainly determined by positioning and clamping. The basic principle of tool setting can be analyzed from the following points.

1. Machine tool and workpiece coordinate system the origin of workpiece coordinate system is generally set or the origin of workpiece itself. A point on the workpiece can be arbitrarily selected as the coordinate origin according to the actual situation. In order to ensure the close connection between the machine tool and the workpiece coordinate system, the actual positioning of the workpiece origin and the relationship between the part positioning dimensions can be determined. The coordinate origin of the machine tool coordinate system has been determined as early as the machine tool manufacturing and cannot be changed arbitrarily. In order to ensure that the tool holder and worktable can return to the mechanical origin every time in the process of simulation graphics and fault repair of NC machine tool, the operator must manually return to zero to ensure the normal operation of machine tool coordinate system.

2. Firstly, decompose the tool setting operation steps to determine the specific position where the tool setting point coincides with the position point. The starting point of the relative movement between the workpiece and the position point is also the tool set point for part machining, and the position point is mainly used as the reference point. Pay attention to the selection of tool set points: first, whether the programming sequence is simple, whether the mathematical processing is convenient, and the error should be minimized for inspection; Second, the reference point of the machine tool needs to have a certain relationship with the programming origin. Before starting the operation, manually reset the coordinate axis to zero to establish a new machine tool coordinate system; Finally, the command of the input NC code should reflect the workpiece coordinate system and the specific position of the position point. Only when the tool position point is clear, can the original position of the tool point be found.