Expansion of the basic 2-axis system is simple. One can have up to 4 axes of continuous path motion via the addition of C & B or C & Y. The C-axis motion control of the work spindle enables toric, biconic, and other freeform surfaces to be machined “on-axis” via our Slow Slide Servo (S3) process. Our Air Bearing Rotary B or removable Oil Hydrostatic Vertical Linear Y-axis can be configured independently on the Z-axis carriage for future added flexibility.