Special attention must be paid to cleanliness during tool installation. Whether for roughing or finishing, the cleanliness of boring tools must be maintained at every stage of installation and assembly. The tool holder must be thoroughly cleaned before assembling with the machine tool, and the inserts must be replaced. Carelessness is unacceptable.
Tool pre-adjustment is crucial; its dimensional accuracy and condition must meet requirements. For indexable boring tools, except for single-edge boring tools, manual trial cutting is generally not used, making pre-adjustment before machining extremely important. Pre-adjustment dimensions must be precise, adjusted to the lower end of the tolerance, and adjustments and compensations should be made to account for temperature factors. Tool pre-adjustment can be performed using a dedicated pre-adjustment instrument, on-machine tool setter, or other measuring instruments.
After tool installation, a dynamic runout check should be performed. Dynamic runout is a comprehensive indicator reflecting the accuracy of the machine tool spindle, the tool, and the connection accuracy between the tool and the machine tool. If this accuracy exceeds 1/2 or 2/3 of the required accuracy of the hole being machined, machining cannot proceed. The cause must be identified and eliminated before machining can continue. Operators must remember this point and strictly adhere to it. Otherwise, the machined holes will not meet the requirements.
The lifespan of each part of the tool should be determined through statistical or testing methods to ensure the reliability of machining accuracy. This requirement is less stringent for single-edged boring tools, but it is particularly important for multi-edged boring tools. The machining characteristics of indexable boring tools are: pre-adjustment of the tool, achieving the required machining in one pass, and ensuring that the tool is not damaged; otherwise, unnecessary accidents may occur.
