Positioning apparatus for multiple-spindle machining

Positioning apparatus for multiple-spindle machining within a predetermined machine space, comprising:

• (a) at least three upstanding columns rigidly interconnected to a common platform and aligned substantially parallel to each other and substantially perpendicular to said platform within an accuracy of .+-.0.0005 inches;
• (b) rail means extending between each of said columns along the periphery defined by the footprint of said columns for providing movable support and having bearing means providing for movability of each rail means along a Y-axis;
• (c) other movement means slidable on each of said rail means along at least another axis of movement;
• (d) linear motor means for selectively moving said rail means between locations along said y axis and for selectively moving said other movement means along said another axis at peak accelerations or decelerations of about 1-2 G's;
• and
• (e) spindle means supported on each said other movement means and having a spindle rotationally driven about an adjustable S-axis.