4. Motion Control Instructions 4.8.3.6 G3: Anticlockwise circular /helical interpolation Function explanation: Circular interpolation: The cutter conducts the cutting of the processed object in the anticlockwise direction at the feed speed given by parameter F on the circular arc with the fixed radius or the fixed center of a circle of the specified plane. Helical interpolation: The cutter moves in the anticlockwise direction on the circular arc of the specified plane ， which is circular interpolation and simultaneously moves in the vertical direction of the specified plane at the feed speed given by parameter F, which is linear interpolation. Format: Format1:
N_G3 X_Y_Z_A_B_C_P_Q_I_J_(I_K_/J_K_)T_ E_E_F_ Format2: N_G3 X_Y_Z_A_B_C_P_Q_R_T_ E_E_F_ Parameter explanation: N_: The row number of G code in NC program X_Y_Z_: Specify the terminal positions of axis X, Y and Z corresponding to the terminal point of circular arc; Unit: unit, data type: REAL. A_B_C_P_Q_: Specify the terminal positions of added axes, Unit: unit, data type: REAL. I_J_: Specify the coordinate position of the center of a circle of XY plane, Unit: unit, data type: REAL. I_K_: Specify the coordinate position of the center of a circle of XZ plane, Unit: unit, data type: REAL. J_K_: Specify the coordinate position of the center of a circle of YZ plane, Unit: unit, data type: REAL.
T_: Specify the quantity of one full circle, Unit: circle, data type: UINT. E_: Specify the acceleration and deceleration of the cutter. The positive number refers to the acceleration; the negative number refers to the deceleration, Unit: unit/second 2 , data type: REAL. Instruction explanation: F: Specify the feed speed of the cutter, Unit: unit/second, data type: REAL. Two axes among axis X, Y and Z make the circular interpolation on the plane specified by G17/G18/G19. The 3rd axis specifies the plane to make the linear interpolation vertically. The added axis A, B, C, P and Q make the linear interpolation.
The linear interpolation and circular interpolation and start up or stop simultaneously. Both of E and F can be omitted. If there is only one row of code in the CNC programming area and E, F are omitted, the velocity, acceleration, deceleration are decided by the parameters of X axis, i.e. “maximum velocity”, “maximum acceleration”, “maximum deceleration” in the parameters of X axis. DVP-MC operating manual 4-201