Dynamic spindle rotation accuracy test introduced

 Precision machine tool spindle assembly consists of the following two ways: 1. Geometric accuracy - geometric precision spindle assembly, is assembled in the no-load low speed rotation (mechanical speed or low speed rotation by hand) under the conditions of the spindle axis and spindle front mounting workpiece or tool parts of the radial and axial runout, and when the spindle of a reference system (such as a knife or table vertical and horizontal bearing manufacturer direction) position accuracy, such as parallelism and verticality; 2. rotational accuracy - refers to a spindle made ​​at normal working speed rotary motion, the axis of the position changes.
Second, the definition of spindle rotation accuracy
When the spindle for rotational movement, at the same moment, the spindle speed is zero on the line connection points, called a rotary shaft center line of the moment, under ideal conditions, the rotation of the spindle at each instant the spatial position of the center line, with respect to a fixed reference system (example: turret, spindle machine tool box or work surface), it should be fixed. In practice, as the spindle journalled in the bearing, the bearing housing and the hole in the spindle, the spindle and gears or other transmission parts, non-circularity of the journal, the bearing defect, the support side facing the shaft the neck is not perpendicular to the center line of the spindle machine tool deflection and causes resonance structure, the spatial position of spindle centerline, at each instant is variable. These moments of the rotary spindle rotation centerline position is defined as the average space ideal for rotary spindle centerline, but also with the fixed reference coordinate system linked. In this way, the centerline of the spindle rotation moment spatial position relative to the ideal position of the center line of the spatial deviation is the instantaneous rotational spindle error motion. These moments error trajectory is rotating spindle error motion trajectory. Spindle error motion range of the so-called "spindle rotation accuracy." Thus, the spindle rotation accuracy, indicating spatial position rotary spindle centerline stability characteristics