Basic Principles of Five-Axis CNC Machining Center
Motion Structure: Includes linear axes (X, Y, Z) and rotary axes (A, B, C). Linear axes control the linear movement of the cutting tool or worktable, while rotary axes typically take the form of combinations such as dual rotary tables (A+C or B+C), a rotary table plus a swivel head (e.g., B-axis rotation plus A-axis rotary table), or dual swivel heads (A+B), to accommodate the machining requirements of different parts.
Coordinate Transformation and Interpolation Control: The CNC system calculates toolpaths in real time, synchronizing the tool’s linear motion with changes in the rotational axes’ angles to ensure that the cutting point remains perpendicular to the surface at all times and to avoid interference. A typical algorithm is inverse kinematics, which converts the tool’s position in the workpiece coordinate system into the actual displacements of each axis.
Tool Center Point (TCP) Control: The origin of the coordinate system is typically set at the intersection of the rotational axes to reduce computational complexity; otherwise, dynamic offset compensation would be required.
