1. Perform homing for the C-axis of both spindles.
2. Move the sub-spindle to the alignment position.
3. Use the handwheel to adjust the sub-spindle's C-axis angle to the correct alignment position and record the angle.
4. Use the handwheel to move the sub-spindle chuck to the part's clamping position.
5. The sub-spindle clamps the workpiece, the main spindle releases the chuck, and the sub-spindle pulls out the workpiece and moves to a safe position.