The NUM CNC system features multi-axis groups and multi-channel capabilities, allowing control of up to 8 axis groups. Each group can manage up to 9 interpolated axes, 32 servo axes, and 4 spindles, with each channel operating independently. We successfully upgraded a Japanese OKUMA twin-axis lathe using the NUM1040T, achieving excellent results.
**1. Overview of the Machine Tool**
The left and right sides of the Japanese OKUMA twin-axis lathe are relatively independent. Each side has its own X and Z axes, spindle, turret-style tool holder, cooling system, and automatic protective door. However, the lubrication, hydraulic, and chip removal systems are shared between both sides.
**2. Control Modes for Two Axis Groups**
The NUM1040T CNC system supports up to two axis groups. Each group can control up to four interpolated axes, six servo axes, and two spindles. The dual-axis control allows for two independent channels, each with its own PLC, NC data exchange area, M codes, T codes, and PLC variables. The system can switch between common and independent axis group modes. In common mode, both groups operate identically, while in independent mode, they can run different programs simultaneously. By configuring system parameters and programming the PLC, full control over the twin-axis setup is achievable.
**3. Twin-Axis Group System Parameters**
- **P97**: Defines the total number of axes in the system.
- **P0**: Specifies which axis is displayed on the screen.
- **P2**: Defines the measuring axis used by the CNC.
- **P3**: Sets the servo control and interpolation axes.
- **P5**: Identifies the machine type for each axis group.
- **P9**: Links axis names to their actual addresses.
- **P6**: Configures the spindle with measurement function and defines the spindle type.
**4. Twin-Axis Group PLC Variables**
- **%W2.2**: Switches between common and independent axis group modes.
- **%W17.B**: Selects the axis group to display data.
- **%Wg03.B**: Chooses the working mode of the independent axis group (g=1~8).
- **%Wg00.5**: Receives M function signals from axis group g.
- **%Wg01.2**: Requests cycle start for independent axis group g.
- **%Wg01.1**: Requests cycle stop for independent axis group g.
- **%Wg02.B**: Overrides feed rate for axis group g.
- **%Rg1E.W**: Returns M function code requested by axis group g.
- **%Rg7C.L**: Specifies the tool number for axis group g.
**5. User Program for Two Axis Groups**
Each machining program is structured with a common sequence number followed by an index for the specific axis group. Subroutines do not require an index. For example:
- `%6.1`: Program number for Axis Group 1
- `%6.2`: Program number for Axis Group 2
Tool numbers (e.g., TXX) can be reused across different groups, as long as they correspond to the correct tool. All programs share a single tool offset table.
Program variables such as L0–L19, L100–L999, and L900–L959 can be used per axis group.
By utilizing the multi-axis group functionality of the NUM CNC system, users gain advanced control over compound machine tools, enabling them to perform multiple operations typically handled by separate machines. This enhances efficiency, reduces setup time, and improves overall productivity.
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