Precitech's Servoform 3D Slow Tool Servo systems is used for rapid manufacture of large departure freeform components on an Ultra Precision Diamond Turning Lathe. The Slow Tool Servo relies on the machine tool’s slide travels to actuate the tool holder synchronous with the rotation of the spindle and cross slide thus creating a system with the ability to perform large departures at slower speeds. Different from the FTS, the tool position of STS is calculated and commanded as three coordinated axis of motion on the machine controller. The Slow Tool Servo option includes the spindle C axis outlined above in combination with special tuning of the Z-slide and special operation software.