US Patent 7698973 Machine with spindle and fixture coaxially aligned with the spindle

A machine includes a spindle for rotating about a rotating axis, a fixture having a central axis coaxial with the rotating axis, a connecting bar and a vacuum pump. The spindle has a first end surface, an opposite second end surface and a plurality of through holes extending through the first and second end surfaces. The connecting bar is detachably interconnected between the fixture and the spindle. The fixture is configured for rotating jointly with the spindle. The vacuum pump is in communication with the through holes.