CNC tool presetting and there are stringent inspection requirements described briefly below , for your reference : When the tool is installed , pay special attention to cleanliness. Boring roughing or finishing tool , whether , in all aspects of installation and assembly , must pay attention to cleanliness. Handle and assembly , blade replacement machine , etc. , should wipe clean , then install or assembly , must not engage in careless . Tool pre-tune its dimensional accuracy, good condition , must meet the requirements. Indexable boring tools, in addition to a single-edged knife boring , in general, try not to cut the use of artificial methods , so pre-set prior to processing is very important . The size must be accurately preset to tune in the lower tolerance , and due consideration of factors temperature correction , compensation. Tool presetting the knife can be carried out in a dedicated or other meter presetting , machine . Dynamic beating after checking tool installation. Dynamic runout inspection is a comprehensive index , which reflects the precision machine tool spindle , tool accuracy and precision of the tool and the machine is connected . If more than the precision required by the accuracy of the machined hole is 1/ 2 or 2/ 3 can not be processed , the need to identify the cause .