What are the error methods for CNC machining
author: Hansheng Automation
2022-01-28
The addition of numerical control machining error △ is a combination of programming error △, machine tool error △, positioning error △, tool setting error △, and other errors.
Namely: △ number plus=f (△ code+△ machine+△ fixed+△ knife)
Namely: △ number plus=f (△ code+△ machine+△ fixed+△ knife)
Among them:
1. Programming error is determined by Approximation error δ、 Rounding error composition. Approximation error δ It is generated during the process of approximating non circular curves using straight or circular segments, as shown in Figure 1.43. Rounding error is the error caused by rounding coordinate values to integer pulse equivalent values during data processing. Pulse equivalent refers to the displacement of the coordinate axis corresponding to each unit pulse. CNC machine tools with ordinary precision level generally have a pulse equivalent value of 0.01mm; The pulse equivalent value of more precise CNC machine tools is 0.005mm or 0.001mm, etc.
2. Machine tool errors are caused by factors such as CNC system errors and feed system errors.
3. Positioning error is generated when the workpiece is positioned on the fixture and the fixture is positioned on the machine tool.
4. Tool alignment error occurs when determining the relative position of the tool and the workpiece.
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