What role does the controller play in maintaining CNC machine accuracy?

The controller in a CNC machine is essential for executing programmed instructions with precision, which is crucial for maintaining the accuracy of the machining process. It interprets the G-code or other programming languages used to dictate the machine's movements, speeds, and other operations. By precisely controlling the movements of the machine's components—such as the spindle and axes—the controller ensures that each operation is performed exactly as planned. This level of accuracy is vital for achieving the desired specifications of the finished product.

In contrast, other functions mentioned, such as adjusting physical dimensions, selecting cutting tools, or monitoring market prices, do not directly influence the precision of the machining process. Adjusting dimensions is a mechanical adjustment typically done during setup or calibration, while tool selection and market monitoring are part of different aspects of machining operations and management, rather than being the core function of the CNC controller.