Continuing from our previous article on pre – operation checks for CNC machine tools, this second part focuses on the inspections that should be carried out during operation and after the machining tasks are completed. These steps are equally important for maintaining the accuracy, efficiency, and reliability of your CNC machines.
1. Spindle and Tool Changer Inspection During Operation
While the CNC machine tools is running, closely monitor the spindle for any abnormal vibrations or noises. Abnormal vibrations can indicate issues such as unbalanced cutting tools, worn – out bearings, or misalignment. Noises can range from a high – pitched squeal, which may suggest insufficient lubrication, to a knocking sound, which could be a sign of more serious mechanical problems. If any such issues are detected, immediately stop the machine and contact a maintenance technician.
For machines equipped with a tool changer, observe the tool – changing process. Ensure that the tool holder and the tool – changing mechanism operate smoothly and accurately. Check that the tool – changing arm moves precisely and that the tools are securely clamped and released. Performing a dry run of the tool – changing process during regular operation can help identify potential malfunctions early.
2. Electrical and Control System Check
Inspect the electrical connections of the CNC machine tools. Look for any loose wires, frayed cables, or signs of overheating, such as blackened insulation. Loose electrical connections can cause power fluctuations, leading to inconsistent machining results or even machine breakdowns. Tighten any loose connections and replace damaged cables immediately.
Check the control panel and display. Ensure that all buttons, switches, and indicators are functioning properly. Test the functionality of the control system by performing basic operations, such as jogging the axes, setting the coordinates, and running a simple program in simulation mode. Check for any error messages on the display. Error messages can provide valuable clues about potential problems within the machine’s control system, and should be addressed promptly to avoid further issues.
3. Post – Operation Clean – up and Documentation
After completing the machining operations for the day, clean the CNC machine tools thoroughly. Remove all chips, debris, and coolant residue from the worktable, machine body, and surrounding areas. Use a brush or vacuum cleaner to clean hard – to – reach places. Wipe down the machine surfaces with a clean cloth to prevent the build – up of dirt and grime, which can lead to corrosion over time.
Document the daily inspection results. Record any abnormalities, maintenance actions taken, and the overall condition of the machine. This documentation is valuable for tracking the machine’s performance over time, identifying recurring problems, and providing information for future maintenance and repair work. It also serves as a reference for operators and maintenance personnel, ensuring that everyone is aware of the machine’s status.
By following this comprehensive two – part daily inspection guide for CNC machine tools, you can proactively identify and address potential issues, minimize downtime, and ensure the consistent and reliable performance of your CNC machines. Regular inspections are an investment in the long – term health and productivity of your machining operations.