In CNC milling, what is the purpose of an indicator?

In CNC milling, the purpose of an indicator is primarily to check the accuracy of tool and workpiece setup. This device, often referred to as a dial indicator, is used to measure very small distances and can detect any deviations in height, alignment, or runout of the tool and the workpiece. By using an indicator, operators ensure that everything is set correctly before the machining process begins, which is crucial for maintaining tolerances and achieving the desired quality of parts.

The accurate setup of tools and workpieces directly impacts the precision of the machining operation, as even minor misalignments can lead to errors in the final product. Therefore, utilizing an indicator is essential to verify that components are positioned correctly relative to one another, ensuring that the CNC milling process runs smoothly and efficiently.

While overseeing the overall machining process, adjusting the feed rate, and optimizing the cooling system are essential aspects of CNC operations, these tasks do not pertain to the specific function of an indicator in ensuring accuracy during setup.