checking in CNC machine Single Block and Dry Run.

 

First part checking in CNC machining is a critical step to ensure the accuracy, safety, and efficiency of the manufacturing process before full production begins. Two indispensable modes used during this phase are Single Block and Dry Run. Both serve to identify and correct potential errors in the CNC program and machine setup, thereby preventing costly damage to the machine, tools, and workpiece.

Program Checking in Single Block Mode

Necessity:

The primary necessity of single block mode is to execute the CNC program one line (or "block") at a time, giving the operator complete control and the ability to meticulously inspect each movement and command. This is crucial for:

• Collision Prevention: By stepping through the program line by line, the operator can visually confirm that the tool paths are clear of the workpiece, fixtures, and machine components, significantly reducing the risk of crashes, especially during rapid traverses or complex movements.
• Verification of G and M Codes: It allows the operator to verify that the G-codes (preparatory functions, like G00 for rapid traverse, G01 for linear interpolation) and M-codes (miscellaneous functions, like M03 for spindle start, M08 for coolant on) are executing as intended and in the correct sequence.
• Offset and Coordinate System Confirmation: The operator can check if the tool length offsets, diameter compensation, and work coordinate system (G54, G55, etc.) are correctly applied and that the tool is positioned accurately relative to the workpiece datum.
• Tool Path Visualization: It provides an opportunity to visualize the exact tool path in real-time, ensuring that the programmed movements match the intended machining strategy and that no unexpected or incorrect moves are occurring.
• Identification of Logic Errors: Complex programs can have subtle logic errors that might not be apparent in simulation. Single block mode helps uncover these by showing the machine's actual response to each command.
• Safe Tool Changes: Tool changes (M06) can be carefully monitored to ensure the correct tool is loaded, the magazine or turret moves safely, and the new tool's offsets are correctly activated.