ABSTRACT
The accuracy of a machined part depends on the precision motion delivered by a machine tool under static, dynamic, and thermal loads. The accuracy is evaluated by measuring the discrepancy between the desired part dimensions identified on a part drawing and the actual part achieved after machining operations. A machine tool system has three main groups of parts: mechanical structures, drives, and controls. In machine tools moving mechanisms are grouped into spindle and feed drives. The control parts include servomotors, amplifiers, switches, and computers. Machine tool chatter vibrations occur due to a self-excitation mechanism in the generation of chip thickness during machining operations. The rotating cutting force and chip thickness directions, and intermittent cutting periods complicate the application of orthogonal chatter theory to milling operations. The finish surface becomes acceptable, and the cutting force magnitude drops at the chatter vibration-free spindle speed and depth of cut.
