Abstract
In this paper, the influences of the protrusion length of tool on the dynamic characteristics of the spindle system are examined experimentally based on the impulse response method. From the experimental results, the following are clarified: In case of shorter tool protrusion, the compliance of primary vibration mode of the spindle system is proportional to 3rd power of protrusion length likely to cantilever bending. In case of the length over the critical length, the compliance remarkably increases, and then, it becomes proportional to 6th power of the length. Such remarkable increase indicates that the vibrational of chuck body cannot be neglected. The critical protrusion length and the compliance increasing characteristics vary corresponding to the type and mechanism of chucks.
