Reasons for the radial runout of tools in CNC milling:

● Reasons for the radial runout of tools in CNC milling:
Manufacturing errors of spindle components and tools, clamping errors caused by eccentricity and drift between the tool axis and the ideal rotation axis of the spindle, as well as specific processing technology, tooling, etc. may cause radial runout of CNC milling machine tools during processing.
1. The influence of the inconsistency between the spindle rotation center and the tool center
When the tool is installed on the spindle, if the rotation center of the spindle is inconsistent with the center of the tool, it will inevitably bring about the radial runout of the tool. Specific influencing factors are: the fit of the chuck and the tool, the correct method of loading the tool, and the quality of the tool itself.

2. The influence of the radial runout of the spindle itself
 The main reasons for the radial runout error of the main shaft are the coaxiality error of each journal of the main shaft, the various errors of the bearing itself, the coaxiality error between the bearings, the deflection of the main shaft, etc., which affect the radial rotation accuracy of the main shaft The size varies with the processing method. These factors are formed in the process of manufacturing and assembly of machine tools, and it is difficult for the operator of the machine tool to avoid their influence.

3. The impact of processing technology
The radial runout of the tool during machining is mainly because the radial cutting force aggravates the radial runout. The radial cutting force is the radial component of the total cutting force. It will cause the workpiece to bend and deform and produce vibration during processing, which is the main component that affects the quality of the workpiece. It is mainly affected by factors such as cutting amount, tool and workpiece material, tool geometric angle, lubrication method and processing method.