Fluid jet cutting system and method for controlling the motion of a fluid jet cutting head

A fluid jet cutting system, comprising:

• a fluid jet cutting head,
• a fluid jet cutting head drive, and
• a control unit coupled to the fluid jet cutting head drive,
• wherein the control unit is configured to:
• move the fluid jet cutting head relative to a workpiece to be cut,
• incline the fluid jet cutting head to a predetermined inclination angle value (PIA) relative to a vertical line (VL),
• operate the motion of the fluid jet cutting head from the predetermined inclination angle value (PIA) and operational data,
• automatically adapt the speed of the fluid jet cutting head in accordance with the predetermined inclination angle value (PIA),
• wherein the predetermined inclination angle value (PIA) is determined based on an angular displacement value (AD), which is a value defined by cutting a calibration portion to measure an actual taper angle or actual trail back angle, and
• the calibration portion is a piece of material having the same material property as the workpiece to be cut.